content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
   * in compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License
   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   * or implied. See the License for the specific language governing permissions and limitations under
   * the License.
   */
  
  package android.telecom;
  
  import android.Manifest;
  import android.annotation.IntDef;
  import android.annotation.Nullable;
  import android.annotation.RequiresPermission;
  import android.annotation.SuppressAutoDoc;
  import android.annotation.SuppressLint;
  import android.annotation.SystemApi;
  import android.annotation.SystemService;
  import android.annotation.TestApi;
  import android.annotation.UnsupportedAppUsage;
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.Intent;
  import android.net.Uri;
  import android.os.Build;
  import android.os.Bundle;
  import android.os.RemoteException;
  import android.os.ServiceManager;
  import android.os.UserHandle;
  import android.telephony.SubscriptionManager;
  import android.telephony.TelephonyManager;
  import android.text.TextUtils;
  import android.util.Log;
  
  import com.android.internal.telecom.ITelecomService;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.concurrent.Executor;
  
  /**
   * Provides access to information about active calls and registration/call-management functionality.
   * Apps can use methods in this class to determine the current call state.
   * <p>
   * Apps do not instantiate this class directly; instead, they retrieve a reference to an instance
   * through {@link Context#getSystemService Context.getSystemService(Context.TELECOM_SERVICE)}.
   * <p>
   * Note that access to some telecom information is permission-protected. Your app cannot access the
   * protected information or gain access to protected functionality unless it has the appropriate
   * permissions declared in its manifest file. Where permissions apply, they are noted in the method
   * descriptions.
   */
  @SuppressAutoDoc
  @SystemService(Context.TELECOM_SERVICE)
  public class TelecomManager {
  
      /**
       * Activity action: Starts the UI for handing an incoming call. This intent starts the in-call
       * UI by notifying the Telecom system that an incoming call exists for a specific call service
       * (see {@link android.telecom.ConnectionService}). Telecom reads the Intent extras to find
       * and bind to the appropriate {@link android.telecom.ConnectionService} which Telecom will
       * ultimately use to control and get information about the call.
       * <p>
       * Input: get*Extra field {@link #EXTRA_PHONE_ACCOUNT_HANDLE} contains the component name of the
       * {@link android.telecom.ConnectionService} that Telecom should bind to. Telecom will then
       * ask the connection service for more information about the call prior to showing any UI.
       *
       * @deprecated Use {@link #addNewIncomingCall} instead.
       */
      public static final String ACTION_INCOMING_CALL = "android.telecom.action.INCOMING_CALL";
  
      /**
       * Similar to {@link #ACTION_INCOMING_CALL}, but is used only by Telephony to add a new
       * sim-initiated MO call for carrier testing.
       * @deprecated Use {@link #addNewUnknownCall} instead.
       * @hide
       */
      public static final String ACTION_NEW_UNKNOWN_CALL = "android.telecom.action.NEW_UNKNOWN_CALL";
  
      /**
       * An {@link android.content.Intent} action sent by the telecom framework to start a
       * configuration dialog for a registered {@link PhoneAccount}. There is no default dialog
       * and each app that registers a {@link PhoneAccount} should provide one if desired.
       * <p>
       * A user can access the list of enabled {@link android.telecom.PhoneAccount}s through the Phone
       * app's settings menu. For each entry, the settings app will add a click action. When
       * triggered, the click-action will start this intent along with the extra
       * {@link #EXTRA_PHONE_ACCOUNT_HANDLE} to indicate the {@link PhoneAccount} to configure. If the
       * {@link PhoneAccount} package does not register an {@link android.app.Activity} for this
       * intent, then it will not be sent.
       */
      public static final String ACTION_CONFIGURE_PHONE_ACCOUNT =
              "android.telecom.action.CONFIGURE_PHONE_ACCOUNT";
  
      /**
       * The {@link android.content.Intent} action used to show the call accessibility settings page.
       */
      public static final String ACTION_SHOW_CALL_ACCESSIBILITY_SETTINGS =
              "android.telecom.action.SHOW_CALL_ACCESSIBILITY_SETTINGS";
  
      /**
       * The {@link android.content.Intent} action used to show the call settings page.
       */
      public static final String ACTION_SHOW_CALL_SETTINGS =
              "android.telecom.action.SHOW_CALL_SETTINGS";
  
      /**
       * The {@link android.content.Intent} action used to show the respond via SMS settings page.
       */
      public static final String ACTION_SHOW_RESPOND_VIA_SMS_SETTINGS =
              "android.telecom.action.SHOW_RESPOND_VIA_SMS_SETTINGS";
  
      /**
       * The {@link android.content.Intent} action used to show the settings page used to configure
       * {@link PhoneAccount} preferences.
       */
      public static final String ACTION_CHANGE_PHONE_ACCOUNTS =
              "android.telecom.action.CHANGE_PHONE_ACCOUNTS";
  
      /**
       * {@link android.content.Intent} action used indicate that a new phone account was just
       * registered.
       * <p>
       * The Intent {@link Intent#getExtras() extras} will contain {@link #EXTRA_PHONE_ACCOUNT_HANDLE}
       * to indicate which {@link PhoneAccount} was registered.
       * <p>
       * Will only be sent to the default dialer app (see {@link #getDefaultDialerPackage()}).
       */
      public static final String ACTION_PHONE_ACCOUNT_REGISTERED =
              "android.telecom.action.PHONE_ACCOUNT_REGISTERED";
  
      /**
       * {@link android.content.Intent} action used indicate that a phone account was just
       * unregistered.
       * <p>
       * The Intent {@link Intent#getExtras() extras} will contain {@link #EXTRA_PHONE_ACCOUNT_HANDLE}
       * to indicate which {@link PhoneAccount} was unregistered.
       * <p>
       * Will only be sent to the default dialer app (see {@link #getDefaultDialerPackage()}).
       */
      public static final String ACTION_PHONE_ACCOUNT_UNREGISTERED =
              "android.telecom.action.PHONE_ACCOUNT_UNREGISTERED";
  
      /**
       * Activity action: Shows a dialog asking the user whether or not they want to replace the
       * current default Dialer with the one specified in
       * {@link #EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME}.
       *
       * Usage example:
       * <pre>
       * Intent intent = new Intent(TelecomManager.ACTION_CHANGE_DEFAULT_DIALER);
       * intent.putExtra(TelecomManager.EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME,
       *         getActivity().getPackageName());
       * startActivity(intent);
       * </pre>
       * <p>
       * This is no longer supported since Q, please use
       * {@link android.app.role.RoleManager#createRequestRoleIntent(String)} with
       * {@link android.app.role.RoleManager#ROLE_DIALER} instead.
       */
      public static final String ACTION_CHANGE_DEFAULT_DIALER =
              "android.telecom.action.CHANGE_DEFAULT_DIALER";
  
      /**
       * Broadcast intent action indicating that the current default dialer has changed.
       * The string extra {@link #EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME} will contain the
       * name of the package that the default dialer was changed to.
       *
       * @see #EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME
       */
      public static final String ACTION_DEFAULT_DIALER_CHANGED =
              "android.telecom.action.DEFAULT_DIALER_CHANGED";
  
      /**
       * Extra value used to provide the package name for {@link #ACTION_CHANGE_DEFAULT_DIALER}.
       */
      public static final String EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME =
              "android.telecom.extra.CHANGE_DEFAULT_DIALER_PACKAGE_NAME";
  
      /**
       * Broadcast intent action indicating that the current default call screening app has changed.
       *
       * The string extra {@link #EXTRA_DEFAULT_CALL_SCREENING_APP_COMPONENT_NAME} will contain the
       * name of the Component of the previous or the new call screening app.
       *
       * The boolean extra {@link #EXTRA_IS_DEFAULT_CALL_SCREENING_APP} will indicate the component
       * name in the String extra {@link #EXTRA_DEFAULT_CALL_SCREENING_APP_COMPONENT_NAME} is default
       * call screening app or not.
       */
      public static final String ACTION_DEFAULT_CALL_SCREENING_APP_CHANGED =
          "android.telecom.action.DEFAULT_CALL_SCREENING_APP_CHANGED";
  
      /**
       * Extra value used with {@link #ACTION_DEFAULT_CALL_SCREENING_APP_CHANGED} broadcast to
       * indicate the ComponentName of the call screening app which has changed.
       */
      public static final String EXTRA_DEFAULT_CALL_SCREENING_APP_COMPONENT_NAME =
              "android.telecom.extra.DEFAULT_CALL_SCREENING_APP_COMPONENT_NAME";
  
      /**
       * Extra value used with {@link #ACTION_DEFAULT_CALL_SCREENING_APP_CHANGED} broadcast to
       * indicate whether an app is the default call screening app.
       */
      public static final String EXTRA_IS_DEFAULT_CALL_SCREENING_APP =
              "android.telecom.extra.IS_DEFAULT_CALL_SCREENING_APP";
  
      /**
       * Optional extra for {@link android.content.Intent#ACTION_CALL} containing a boolean that
       * determines whether the speakerphone should be automatically turned on for an outgoing call.
       */
      public static final String EXTRA_START_CALL_WITH_SPEAKERPHONE =
              "android.telecom.extra.START_CALL_WITH_SPEAKERPHONE";
  
      /**
       * Optional extra for {@link android.content.Intent#ACTION_CALL} containing an integer that
       * determines the desired video state for an outgoing call.
       * Valid options:
       * {@link VideoProfile#STATE_AUDIO_ONLY},
       * {@link VideoProfile#STATE_BIDIRECTIONAL},
       * {@link VideoProfile#STATE_RX_ENABLED},
       * {@link VideoProfile#STATE_TX_ENABLED}.
       */
      public static final String EXTRA_START_CALL_WITH_VIDEO_STATE =
              "android.telecom.extra.START_CALL_WITH_VIDEO_STATE";
  
      /**
       * Optional extra for {@link #addNewIncomingCall(PhoneAccountHandle, Bundle)} containing an
       * integer that determines the requested video state for an incoming call.
       * Valid options:
       * {@link VideoProfile#STATE_AUDIO_ONLY},
       * {@link VideoProfile#STATE_BIDIRECTIONAL},
       * {@link VideoProfile#STATE_RX_ENABLED},
       * {@link VideoProfile#STATE_TX_ENABLED}.
       */
      public static final String EXTRA_INCOMING_VIDEO_STATE =
              "android.telecom.extra.INCOMING_VIDEO_STATE";
  
      /**
       * The extra used with an {@link android.content.Intent#ACTION_CALL} and
       * {@link android.content.Intent#ACTION_DIAL} {@code Intent} to specify a
       * {@link PhoneAccountHandle} to use when making the call.
       * <p class="note">
       * Retrieve with {@link android.content.Intent#getParcelableExtra(String)}.
       */
      public static final String EXTRA_PHONE_ACCOUNT_HANDLE =
              "android.telecom.extra.PHONE_ACCOUNT_HANDLE";
  
      /**
       * Optional extra for {@link android.content.Intent#ACTION_CALL} containing a string call
       * subject which will be associated with an outgoing call.  Should only be specified if the
       * {@link PhoneAccount} supports the capability {@link PhoneAccount#CAPABILITY_CALL_SUBJECT}.
       */
      public static final String EXTRA_CALL_SUBJECT = "android.telecom.extra.CALL_SUBJECT";
  
      /**
       * The extra used by a {@link ConnectionService} to provide the handle of the caller that
       * has initiated a new incoming call.
       */
      public static final String EXTRA_INCOMING_CALL_ADDRESS =
              "android.telecom.extra.INCOMING_CALL_ADDRESS";
  
      /**
       * Optional extra for {@link #ACTION_INCOMING_CALL} containing a {@link Bundle} which contains
       * metadata about the call. This {@link Bundle} will be returned to the
       * {@link ConnectionService}.
       */
      public static final String EXTRA_INCOMING_CALL_EXTRAS =
              "android.telecom.extra.INCOMING_CALL_EXTRAS";
  
      /**
       * Optional extra for {@link #ACTION_INCOMING_CALL} containing a boolean to indicate that the
       * call has an externally generated ringer. Used by the HfpClientConnectionService when In Band
       * Ringtone is enabled to prevent two ringers from being generated.
       * @hide
       */
      public static final String EXTRA_CALL_EXTERNAL_RINGER =
              "android.telecom.extra.CALL_EXTERNAL_RINGER";
  
      /**
       * Optional extra for {@link android.content.Intent#ACTION_CALL} and
       * {@link android.content.Intent#ACTION_DIAL} {@code Intent} containing a {@link Bundle}
       * which contains metadata about the call. This {@link Bundle} will be saved into
       * {@code Call.Details} and passed to the {@link ConnectionService} when placing the call.
       */
      public static final String EXTRA_OUTGOING_CALL_EXTRAS =
              "android.telecom.extra.OUTGOING_CALL_EXTRAS";
  
      /**
       * An optional boolean extra on {@link android.content.Intent#ACTION_CALL_EMERGENCY} to tell
       * whether the user's dial intent is emergency; this is required to specify when the dialed
       * number is ambiguous, identified as both emergency number and any other non-emergency number;
       * e.g. in some situation, 611 could be both an emergency number in a country and a
       * non-emergency number of a carrier's customer service hotline.
       *
       * @hide
       */
      @SystemApi
      public static final String EXTRA_IS_USER_INTENT_EMERGENCY_CALL =
              "android.telecom.extra.IS_USER_INTENT_EMERGENCY_CALL";
  
      /**
       * @hide
       */
      public static final String EXTRA_UNKNOWN_CALL_HANDLE =
              "android.telecom.extra.UNKNOWN_CALL_HANDLE";
  
      /**
       * Optional extra for incoming and outgoing calls containing a long which specifies the time the
       * call was created. This value is in milliseconds since boot.
       * @hide
       */
      public static final String EXTRA_CALL_CREATED_TIME_MILLIS =
              "android.telecom.extra.CALL_CREATED_TIME_MILLIS";
  
      /**
       * Optional extra for incoming and outgoing calls containing a long which specifies the time
       * telecom began routing the call. This value is in milliseconds since boot.
       * @hide
       */
      public static final String EXTRA_CALL_TELECOM_ROUTING_START_TIME_MILLIS =
              "android.telecom.extra.CALL_TELECOM_ROUTING_START_TIME_MILLIS";
  
      /**
       * Optional extra for incoming and outgoing calls containing a long which specifies the time
       * telecom finished routing the call. This value is in milliseconds since boot.
       * @hide
       */
      public static final String EXTRA_CALL_TELECOM_ROUTING_END_TIME_MILLIS =
              "android.telecom.extra.CALL_TELECOM_ROUTING_END_TIME_MILLIS";
  
      /**
       * Optional extra for {@link android.telephony.TelephonyManager#ACTION_PHONE_STATE_CHANGED}
       * containing the disconnect code.
       */
      public static final String EXTRA_CALL_DISCONNECT_CAUSE =
              "android.telecom.extra.CALL_DISCONNECT_CAUSE";
  
      /**
       * Optional extra for {@link android.telephony.TelephonyManager#ACTION_PHONE_STATE_CHANGED}
       * containing the disconnect message.
       */
      public static final String EXTRA_CALL_DISCONNECT_MESSAGE =
              "android.telecom.extra.CALL_DISCONNECT_MESSAGE";
  
      /**
       * Optional extra for {@link android.telephony.TelephonyManager#ACTION_PHONE_STATE_CHANGED}
       * containing the component name of the associated connection service.
       * @hide
       */
      @SystemApi
      public static final String EXTRA_CONNECTION_SERVICE =
              "android.telecom.extra.CONNECTION_SERVICE";
  
      /**
       * Optional extra for communicating the call technology used by a
       * {@link com.android.internal.telephony.Connection} to Telecom
       * @hide
       */
      public static final String EXTRA_CALL_TECHNOLOGY_TYPE =
              "android.telecom.extra.CALL_TECHNOLOGY_TYPE";
  
      /**
       * Optional extra for communicating the call network technology used by a
       * {@link android.telecom.Connection} to Telecom and InCallUI.
       *
       * @see {@code NETWORK_TYPE_*} in {@link android.telephony.TelephonyManager}.
       */
      public static final String EXTRA_CALL_NETWORK_TYPE =
              "android.telecom.extra.CALL_NETWORK_TYPE";
  
      /**
       * An optional {@link android.content.Intent#ACTION_CALL} intent extra denoting the
       * package name of the app specifying an alternative gateway for the call.
       * The value is a string.
       *
       * (The following comment corresponds to the all GATEWAY_* extras)
       * An app which sends the {@link android.content.Intent#ACTION_CALL} intent can specify an
       * alternative address to dial which is different from the one specified and displayed to
       * the user. This alternative address is referred to as the gateway address.
       */
      public static final String GATEWAY_PROVIDER_PACKAGE =
              "android.telecom.extra.GATEWAY_PROVIDER_PACKAGE";
  
      /**
       * An optional {@link android.content.Intent#ACTION_CALL} intent extra corresponding to the
       * original address to dial for the call. This is used when an alternative gateway address is
       * provided to recall the original address.
       * The value is a {@link android.net.Uri}.
       *
       * (See {@link #GATEWAY_PROVIDER_PACKAGE} for details)
       */
      public static final String GATEWAY_ORIGINAL_ADDRESS =
              "android.telecom.extra.GATEWAY_ORIGINAL_ADDRESS";
  
      /**
       * The number which the party on the other side of the line will see (and use to return the
       * call).
       * <p>
       * {@link ConnectionService}s which interact with {@link RemoteConnection}s should only populate
       * this if the {@link android.telephony.TelephonyManager#getLine1Number()} value, as that is the
       * user's expected caller ID.
       */
      public static final String EXTRA_CALL_BACK_NUMBER = "android.telecom.extra.CALL_BACK_NUMBER";
  
      /**
       * The number of milliseconds that Telecom should wait after disconnecting a call via the
       * ACTION_NEW_OUTGOING_CALL broadcast, in order to wait for the app which cancelled the call
       * to make a new one.
       * @hide
       */
      public static final String EXTRA_NEW_OUTGOING_CALL_CANCEL_TIMEOUT =
              "android.telecom.extra.NEW_OUTGOING_CALL_CANCEL_TIMEOUT";
  
      /**
       * Boolean extra specified to indicate that the intention of adding a call is to handover an
       * existing call from the user's device to a different {@link PhoneAccount}.
       * <p>
       * Used when calling {@link #addNewIncomingCall(PhoneAccountHandle, Bundle)}
       * to indicate to Telecom that the purpose of adding a new incoming call is to handover an
       * existing call from the user's device to a different {@link PhoneAccount}.  This occurs on
       * the receiving side of a handover.
       * <p>
       * Used when Telecom calls
       * {@link ConnectionService#onCreateOutgoingConnection(PhoneAccountHandle, ConnectionRequest)}
       * to indicate that the purpose of Telecom requesting a new outgoing connection it to request
       * a handover to this {@link ConnectionService} from an ongoing call on the user's device.  This
       * occurs on the initiating side of a handover.
       * <p>
       * The phone number of the call used by Telecom to determine which call should be handed over.
       * @hide
       * @deprecated Use the public handover APIs.  See
       * {@link Call#handoverTo(PhoneAccountHandle, int, Bundle)} for more information.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 119305590)
      public static final String EXTRA_IS_HANDOVER = "android.telecom.extra.IS_HANDOVER";
  
      /**
       * When {@code true} indicates that a request to create a new connection is for the purpose of
       * a handover.  Note: This is used with the
       * {@link android.telecom.Call#handoverTo(PhoneAccountHandle, int, Bundle)} API as part of the
       * internal communication mechanism with the {@link android.telecom.ConnectionService}.  It is
       * not the same as the legacy {@link #EXTRA_IS_HANDOVER} extra.
       * @hide
       */
      public static final String EXTRA_IS_HANDOVER_CONNECTION =
              "android.telecom.extra.IS_HANDOVER_CONNECTION";
  
      /**
       * Parcelable extra used with {@link #EXTRA_IS_HANDOVER} to indicate the source
       * {@link PhoneAccountHandle} when initiating a handover which {@link ConnectionService}
       * the handover is from.
       * @hide
       */
      public static final String EXTRA_HANDOVER_FROM_PHONE_ACCOUNT =
              "android.telecom.extra.HANDOVER_FROM_PHONE_ACCOUNT";
  
      /**
       * Extra key specified in the {@link ConnectionRequest#getExtras()} when Telecom calls
       * {@link ConnectionService#onCreateOutgoingConnection(PhoneAccountHandle, ConnectionRequest)}
       * to inform the {@link ConnectionService} what the initial {@link CallAudioState} of the
       * {@link Connection} will be.
       * @hide
       */
      public static final String EXTRA_CALL_AUDIO_STATE = "android.telecom.extra.CALL_AUDIO_STATE";
  
      /**
       * A boolean extra, which when set on the {@link Intent#ACTION_CALL} intent or on the bundle
       * passed into {@link #placeCall(Uri, Bundle)}, indicates that the call should be initiated with
       * an RTT session open. See {@link android.telecom.Call.RttCall} for more information on RTT.
       */
      public static final String EXTRA_START_CALL_WITH_RTT =
              "android.telecom.extra.START_CALL_WITH_RTT";
  
      /**
       * A boolean meta-data value indicating whether an {@link InCallService} implements an
       * in-call user interface. Dialer implementations (see {@link #getDefaultDialerPackage()}) which
       * would also like to replace the in-call interface should set this meta-data to {@code true} in
       * the manifest registration of their {@link InCallService}.
       */
      public static final String METADATA_IN_CALL_SERVICE_UI = "android.telecom.IN_CALL_SERVICE_UI";
  
      /**
       * A boolean meta-data value indicating whether an {@link InCallService} implements an
       * in-call user interface to be used while the device is in car-mode (see
       * {@link android.content.res.Configuration#UI_MODE_TYPE_CAR}).
       */
      public static final String METADATA_IN_CALL_SERVICE_CAR_MODE_UI =
              "android.telecom.IN_CALL_SERVICE_CAR_MODE_UI";
  
      /**
       * A boolean meta-data value indicating whether an {@link InCallService} implements ringing.
       * Dialer implementations (see {@link #getDefaultDialerPackage()}) which would also like to
       * override the system provided ringing should set this meta-data to {@code true} in the
       * manifest registration of their {@link InCallService}.
       * <p>
       * When {@code true}, it is the {@link InCallService}'s responsibility to play a ringtone for
       * all incoming calls.
       */
      public static final String METADATA_IN_CALL_SERVICE_RINGING =
              "android.telecom.IN_CALL_SERVICE_RINGING";
  
      /**
       * A boolean meta-data value indicating whether an {@link InCallService} wants to be informed of
       * calls which have the {@link Call.Details#PROPERTY_IS_EXTERNAL_CALL} property.  An external
       * call is one which a {@link ConnectionService} knows about, but is not connected to directly.
       * Dialer implementations (see {@link #getDefaultDialerPackage()}) which would like to be
       * informed of external calls should set this meta-data to {@code true} in the manifest
       * registration of their {@link InCallService}.  By default, the {@link InCallService} will NOT
       * be informed of external calls.
       */
      public static final String METADATA_INCLUDE_EXTERNAL_CALLS =
              "android.telecom.INCLUDE_EXTERNAL_CALLS";
  
      /**
       * A boolean meta-data value indicating whether an {@link InCallService} wants to be informed of
       * calls which have the {@link Call.Details#PROPERTY_SELF_MANAGED} property.  A self-managed
       * call is one which originates from a self-managed {@link ConnectionService} which has chosen
       * to implement its own call user interface.  An {@link InCallService} implementation which
       * would like to be informed of external calls should set this meta-data to {@code true} in the
       * manifest registration of their {@link InCallService}.  By default, the {@link InCallService}
       * will NOT be informed about self-managed calls.
       * <p>
       * An {@link InCallService} which receives self-managed calls is free to view and control the
       * state of calls in the self-managed {@link ConnectionService}.  An example use-case is
       * exposing these calls to an automotive device via its companion app.
       * <p>
       * This meta-data can only be set for an {@link InCallService} which also sets
       * {@link #METADATA_IN_CALL_SERVICE_UI}. Only the default phone/dialer app, or a car-mode
       * {@link InCallService} can see self-managed calls.
       * <p>
       * See also {@link Connection#PROPERTY_SELF_MANAGED}.
       */
      public static final String METADATA_INCLUDE_SELF_MANAGED_CALLS =
              "android.telecom.INCLUDE_SELF_MANAGED_CALLS";
  
      /**
       * The dual tone multi-frequency signaling character sent to indicate the dialing system should
       * pause for a predefined period.
       */
      public static final char DTMF_CHARACTER_PAUSE = ',';
  
      /**
       * The dual-tone multi-frequency signaling character sent to indicate the dialing system should
       * wait for user confirmation before proceeding.
       */
      public static final char DTMF_CHARACTER_WAIT = ';';
  
      /**
       * @hide
       */
      @IntDef(prefix = { "TTY_MODE_" },
              value = {TTY_MODE_OFF, TTY_MODE_FULL, TTY_MODE_HCO, TTY_MODE_VCO})
      @Retention(RetentionPolicy.SOURCE)
      public @interface TtyMode {}
  
      /**
       * TTY (teletypewriter) mode is off.
       *
       * @hide
       */
      @TestApi
      @SystemApi
      public static final int TTY_MODE_OFF = 0;
  
      /**
       * TTY (teletypewriter) mode is on. The speaker is off and the microphone is muted. The user
       * will communicate with the remote party by sending and receiving text messages.
       *
       * @hide
       */
      @TestApi
      @SystemApi
      public static final int TTY_MODE_FULL = 1;
  
      /**
       * TTY (teletypewriter) mode is in hearing carryover mode (HCO). The microphone is muted but the
       * speaker is on. The user will communicate with the remote party by sending text messages and
       * hearing an audible reply.
       *
       * @hide
       */
      @TestApi
      @SystemApi
      public static final int TTY_MODE_HCO = 2;
  
      /**
       * TTY (teletypewriter) mode is in voice carryover mode (VCO). The speaker is off but the
       * microphone is still on. User will communicate with the remote party by speaking and receiving
       * text message replies.
       *
       * @hide
       */
      @TestApi
      @SystemApi
      public static final int TTY_MODE_VCO = 3;
  
      /**
       * Broadcast intent action indicating that the current TTY mode has changed. An intent extra
       * provides this state as an int.
       *
       * @see #EXTRA_CURRENT_TTY_MODE
       * @hide
       */
      public static final String ACTION_CURRENT_TTY_MODE_CHANGED =
              "android.telecom.action.CURRENT_TTY_MODE_CHANGED";
  
      /**
       * The lookup key for an int that indicates the current TTY mode.
       * Valid modes are:
       * - {@link #TTY_MODE_OFF}
       * - {@link #TTY_MODE_FULL}
       * - {@link #TTY_MODE_HCO}
       * - {@link #TTY_MODE_VCO}
       *
       * @hide
       */
      public static final String EXTRA_CURRENT_TTY_MODE =
              "android.telecom.intent.extra.CURRENT_TTY_MODE";
  
      /**
       * Broadcast intent action indicating that the TTY preferred operating mode has changed. An
       * intent extra provides the new mode as an int.
       *
       * @see #EXTRA_TTY_PREFERRED_MODE
       * @hide
       */
      public static final String ACTION_TTY_PREFERRED_MODE_CHANGED =
              "android.telecom.action.TTY_PREFERRED_MODE_CHANGED";
  
      /**
       * The lookup key for an int that indicates preferred TTY mode. Valid modes are: -
       * {@link #TTY_MODE_OFF} - {@link #TTY_MODE_FULL} - {@link #TTY_MODE_HCO} -
       * {@link #TTY_MODE_VCO}
       *
       * @hide
       */
      public static final String EXTRA_TTY_PREFERRED_MODE =
              "android.telecom.intent.extra.TTY_PREFERRED";
  
      /**
       * Broadcast intent action for letting custom component know to show the missed call
       * notification. If no custom component exists then this is sent to the default dialer which
       * should post a missed-call notification.
       */
      public static final String ACTION_SHOW_MISSED_CALLS_NOTIFICATION =
              "android.telecom.action.SHOW_MISSED_CALLS_NOTIFICATION";
  
      /**
       * The number of calls associated with the notification. If the number is zero then the missed
       * call notification should be dismissed.
       */
      public static final String EXTRA_NOTIFICATION_COUNT =
              "android.telecom.extra.NOTIFICATION_COUNT";
  
      /**
       * The number associated with the missed calls. This number is only relevant
       * when EXTRA_NOTIFICATION_COUNT is 1.
       */
      public static final String EXTRA_NOTIFICATION_PHONE_NUMBER =
              "android.telecom.extra.NOTIFICATION_PHONE_NUMBER";
  
      /**
       * The intent to clear missed calls.
       * @hide
       */
      @SystemApi
      public static final String EXTRA_CLEAR_MISSED_CALLS_INTENT =
              "android.telecom.extra.CLEAR_MISSED_CALLS_INTENT";
  
      /**
       * The intent to call back a missed call.
       * @hide
       */
      @SystemApi
      public static final String EXTRA_CALL_BACK_INTENT =
              "android.telecom.extra.CALL_BACK_INTENT";
  
      /**
       * The dialer activity responsible for placing emergency calls from, for example, a locked
       * keyguard.
       * @hide
       */
      public static final ComponentName EMERGENCY_DIALER_COMPONENT =
              ComponentName.createRelative("com.android.phone", ".EmergencyDialer");
  
      /**
       * The boolean indicated by this extra controls whether or not a call is eligible to undergo
       * assisted dialing. This extra is stored under {@link #EXTRA_OUTGOING_CALL_EXTRAS}.
       * @hide
       */
      public static final String EXTRA_USE_ASSISTED_DIALING =
              "android.telecom.extra.USE_ASSISTED_DIALING";
  
      /**
       * Optional extra for {@link #placeCall(Uri, Bundle)} containing an integer that specifies
       * the source where user initiated this call. This data is used in metrics.
       * Valid source are:
       * {@link ParcelableCallAnalytics#CALL_SOURCE_UNSPECIFIED},
       * {@link ParcelableCallAnalytics#CALL_SOURCE_EMERGENCY_DIALPAD},
       * {@link ParcelableCallAnalytics#CALL_SOURCE_EMERGENCY_SHORTCUT}.
       *
       * @hide
       */
      public static final String EXTRA_CALL_SOURCE = "android.telecom.extra.CALL_SOURCE";
  
      /**
       * The following 4 constants define how properties such as phone numbers and names are
       * displayed to the user.
       */
  
      /**
       * Indicates that the address or number of a call is allowed to be displayed for caller ID.
       */
      public static final int PRESENTATION_ALLOWED = 1;
  
      /**
       * Indicates that the address or number of a call is blocked by the other party.
       */
      public static final int PRESENTATION_RESTRICTED = 2;
  
      /**
       * Indicates that the address or number of a call is not specified or known by the carrier.
       */
      public static final int PRESENTATION_UNKNOWN = 3;
  
      /**
       * Indicates that the address or number of a call belongs to a pay phone.
       */
      public static final int PRESENTATION_PAYPHONE = 4;
  
      private static final String TAG = "TelecomManager";
  
      private final Context mContext;
  
      private final ITelecomService mTelecomServiceOverride;
  
      /**
       * @hide
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
      public static TelecomManager from(Context context) {
          return (TelecomManager) context.getSystemService(Context.TELECOM_SERVICE);
      }
  
      /**
       * @hide
       */
      public TelecomManager(Context context) {
          this(context, null);
      }
  
      /**
       * @hide
       */
      public TelecomManager(Context context, ITelecomService telecomServiceImpl) {
          Context appContext = context.getApplicationContext();
          if (appContext != null) {
              mContext = appContext;
          } else {
              mContext = context;
          }
          mTelecomServiceOverride = telecomServiceImpl;
      }
  
      /**
       * Return the {@link PhoneAccount} which will be used to place outgoing calls to addresses with
       * the specified {@code uriScheme}. This {@link PhoneAccount} will always be a member of the
       * list which is returned from invoking {@link #getCallCapablePhoneAccounts()}. The specific
       * account returned depends on the following priorities:
       * <ul>
       * <li> If the user-selected default {@link PhoneAccount} supports the specified scheme, it will
       * be returned.
       * </li>
       * <li> If there exists only one {@link PhoneAccount} that supports the specified scheme, it
       * will be returned.
       * </li>
       * </ul>
       * <p>
       * If no {@link PhoneAccount} fits the criteria above, this method will return {@code null}.
       *
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @param uriScheme The URI scheme.
       * @return The {@link PhoneAccountHandle} corresponding to the account to be used.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public PhoneAccountHandle getDefaultOutgoingPhoneAccount(String uriScheme) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getDefaultOutgoingPhoneAccount(uriScheme,
                          mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getDefaultOutgoingPhoneAccount", e);
          }
          return null;
      }
  
      /**
       * Return the {@link PhoneAccount} which is the user-chosen default for making outgoing phone
       * calls. This {@code PhoneAccount} will always be a member of the list which is returned from
       * calling {@link #getCallCapablePhoneAccounts()}
       * <p>
       * Apps must be prepared for this method to return {@code null}, indicating that there currently
       * exists no user-chosen default {@code PhoneAccount}.
       * <p>
       * The default dialer has access to use this method.
       *
       * @return The user outgoing phone account selected by the user, or {@code null} if there is no
       * user selected outgoing {@link PhoneAccountHandle}.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public @Nullable PhoneAccountHandle getUserSelectedOutgoingPhoneAccount() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getUserSelectedOutgoingPhoneAccount(
                          mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getUserSelectedOutgoingPhoneAccount", e);
          }
          return null;
      }
  
      /**
       * Sets the user-chosen default {@link PhoneAccountHandle} for making outgoing phone calls.
       *
       * @param accountHandle The {@link PhoneAccountHandle} which will be used by default for making
       *                      outgoing voice calls, or {@code null} if no default is specified (the
       *                      user will be asked each time a call is placed in this case).
       * @hide
       */
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      @TestApi
      @SystemApi
      public void setUserSelectedOutgoingPhoneAccount(@Nullable PhoneAccountHandle accountHandle) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().setUserSelectedOutgoingPhoneAccount(accountHandle);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#setUserSelectedOutgoingPhoneAccount");
          }
      }
  
      /**
       * Returns the current SIM call manager. Apps must be prepared for this method to return
       * {@code null}, indicating that there currently exists no SIM call manager {@link PhoneAccount}
       * for the default voice subscription.
       *
       * @return The phone account handle of the current sim call manager for the default voice
       * subscription.
       * @see SubscriptionManager#getDefaultVoiceSubscriptionId()
       */
      public PhoneAccountHandle getSimCallManager() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getSimCallManager(
                          SubscriptionManager.getDefaultSubscriptionId());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getSimCallManager");
          }
          return null;
      }
  
      /**
       * Returns current SIM call manager for the Telephony Subscription ID specified. Apps must be
       * prepared for this method to return {@code null}, indicating that there currently exists no
       * SIM call manager {@link PhoneAccount} for the subscription specified.
       *
       * @param subscriptionId The Telephony Subscription ID that the SIM call manager should be
       *                       queried for.
       * @return The phone account handle of the current sim call manager.
       * @see SubscriptionManager#getActiveSubscriptionInfoList()
       * @hide
       */
      public PhoneAccountHandle getSimCallManagerForSubscription(int subscriptionId) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getSimCallManager(subscriptionId);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getSimCallManager");
          }
          return null;
      }
  
      /**
       * Returns the current SIM call manager for the user-chosen default Telephony Subscription ID
       * (see {@link SubscriptionManager#getDefaultSubscriptionId()}) and the specified user. Apps
       * must be prepared for this method to return {@code null}, indicating that there currently
       * exists no SIM call manager {@link PhoneAccount} for the default voice subscription.
       *
       * @return The phone account handle of the current sim call manager.
       *
       * @hide
       * @deprecated Use {@link #getSimCallManager()}.
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 119305590)
      public PhoneAccountHandle getSimCallManager(int userId) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getSimCallManagerForUser(userId);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getSimCallManagerForUser");
          }
          return null;
      }
  
      /**
       * Returns the current connection manager. Apps must be prepared for this method to return
       * {@code null}, indicating that there currently exists no Connection Manager
       * {@link PhoneAccount} for the default voice subscription.
       *
       * @return The phone account handle of the current connection manager.
       * @hide
       */
      @SystemApi
      public PhoneAccountHandle getConnectionManager() {
          return getSimCallManager();
      }
  
      /**
       * Returns a list of the {@link PhoneAccountHandle}s which can be used to make and receive phone
       * calls which support the specified URI scheme.
       * <P>
       * For example, invoking with {@code "tel"} will find all {@link PhoneAccountHandle}s which
       * support telephone calls (e.g. URIs such as {@code tel:555-555-1212}).  Invoking with
       * {@code "sip"} will find all {@link PhoneAccountHandle}s which support SIP calls (e.g. URIs
       * such as {@code sip:example@sipexample.com}).
       *
       * @param uriScheme The URI scheme.
       * @return A list of {@code PhoneAccountHandle} objects supporting the URI scheme.
       * @hide
       */
      @SystemApi
      @RequiresPermission(anyOf = {
              android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE,
              android.Manifest.permission.READ_PHONE_STATE
      })
      public List<PhoneAccountHandle> getPhoneAccountsSupportingScheme(String uriScheme) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getPhoneAccountsSupportingScheme(uriScheme,
                          mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getPhoneAccountsSupportingScheme", e);
          }
          return new ArrayList<>();
      }
  
  
      /**
       * Returns a list of {@link PhoneAccountHandle}s which can be used to make and receive phone
       * calls. The returned list includes only those accounts which have been explicitly enabled
       * by the user.
       *
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @see #EXTRA_PHONE_ACCOUNT_HANDLE
       * @return A list of {@code PhoneAccountHandle} objects.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public List<PhoneAccountHandle> getCallCapablePhoneAccounts() {
          return getCallCapablePhoneAccounts(false);
      }
  
      /**
       * Returns a list of {@link PhoneAccountHandle}s for self-managed {@link ConnectionService}s.
       * <p>
       * Self-Managed {@link ConnectionService}s have a {@link PhoneAccount} with
       * {@link PhoneAccount#CAPABILITY_SELF_MANAGED}.
       * <p>
       * Requires permission {@link android.Manifest.permission#READ_PHONE_STATE}, or that the caller
       * is the default dialer app.
       * <p>
       * A {@link SecurityException} will be thrown if a called is not the default dialer, or lacks
       * the {@link android.Manifest.permission#READ_PHONE_STATE} permission.
       *
       * @return A list of {@code PhoneAccountHandle} objects.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public List<PhoneAccountHandle> getSelfManagedPhoneAccounts() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getSelfManagedPhoneAccounts(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getSelfManagedPhoneAccounts()", e);
          }
          return new ArrayList<>();
      }
  
      /**
       * Returns a list of {@link PhoneAccountHandle}s including those which have not been enabled
       * by the user.
       *
       * @param includeDisabledAccounts When {@code true}, disabled phone accounts will be included,
       *                                when {@code false}, only
       * @return A list of {@code PhoneAccountHandle} objects.
       * @hide
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 119305590)
      public List<PhoneAccountHandle> getCallCapablePhoneAccounts(boolean includeDisabledAccounts) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getCallCapablePhoneAccounts(
                          includeDisabledAccounts, mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getCallCapablePhoneAccounts(" +
                      includeDisabledAccounts + ")", e);
          }
          return new ArrayList<>();
      }
  
      /**
       *  Returns a list of all {@link PhoneAccount}s registered for the calling package.
       *
       * @return A list of {@code PhoneAccountHandle} objects.
       * @hide
       */
      @SystemApi
      @SuppressLint("Doclava125")
      public List<PhoneAccountHandle> getPhoneAccountsForPackage() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getPhoneAccountsForPackage(mContext.getPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getPhoneAccountsForPackage", e);
          }
          return null;
      }
  
      /**
       * Return the {@link PhoneAccount} for a specified {@link PhoneAccountHandle}. Object includes
       * resources which can be used in a user interface.
       *
       * @param account The {@link PhoneAccountHandle}.
       * @return The {@link PhoneAccount} object.
       */
      public PhoneAccount getPhoneAccount(PhoneAccountHandle account) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getPhoneAccount(account);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getPhoneAccount", e);
          }
          return null;
      }
  
      /**
       * Returns a count of all {@link PhoneAccount}s.
       *
       * @return The count of {@link PhoneAccount}s.
       * @hide
       */
      @SystemApi
      public int getAllPhoneAccountsCount() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getAllPhoneAccountsCount();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getAllPhoneAccountsCount", e);
          }
          return 0;
      }
  
      /**
       * Returns a list of all {@link PhoneAccount}s.
       *
       * @return All {@link PhoneAccount}s.
       * @hide
       */
      @SystemApi
      public List<PhoneAccount> getAllPhoneAccounts() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getAllPhoneAccounts();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getAllPhoneAccounts", e);
          }
          return Collections.EMPTY_LIST;
      }
  
      /**
       * Returns a list of all {@link PhoneAccountHandle}s.
       *
       * @return All {@link PhoneAccountHandle}s.
       * @hide
       */
      @SystemApi
      public List<PhoneAccountHandle> getAllPhoneAccountHandles() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getAllPhoneAccountHandles();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#getAllPhoneAccountHandles", e);
          }
          return Collections.EMPTY_LIST;
      }
  
      /**
       * Register a {@link PhoneAccount} for use by the system that will be stored in Device Encrypted
       * storage. When registering {@link PhoneAccount}s, existing registrations will be overwritten
       * if the {@link PhoneAccountHandle} matches that of a {@link PhoneAccount} which is already
       * registered. Once registered, the {@link PhoneAccount} is listed to the user as an option
       * when placing calls. The user may still need to enable the {@link PhoneAccount} within
       * the phone app settings before the account is usable.
       * <p>
       * A {@link SecurityException} will be thrown if an app tries to register a
       * {@link PhoneAccountHandle} where the package name specified within
       * {@link PhoneAccountHandle#getComponentName()} does not match the package name of the app.
       *
       * @param account The complete {@link PhoneAccount}.
       */
      public void registerPhoneAccount(PhoneAccount account) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().registerPhoneAccount(account);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#registerPhoneAccount", e);
          }
      }
  
      /**
       * Remove a {@link PhoneAccount} registration from the system.
       *
       * @param accountHandle A {@link PhoneAccountHandle} for the {@link PhoneAccount} to unregister.
       */
      public void unregisterPhoneAccount(PhoneAccountHandle accountHandle) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().unregisterPhoneAccount(accountHandle);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#unregisterPhoneAccount", e);
          }
      }
  
      /**
       * Remove all Accounts that belong to the calling package from the system.
       * @hide
       */
      @SystemApi
      @SuppressLint("Doclava125")
      public void clearPhoneAccounts() {
          clearAccounts();
      }
      /**
       * Remove all Accounts that belong to the calling package from the system.
       * @deprecated Use {@link #clearPhoneAccounts()} instead.
       * @hide
       */
      @SystemApi
      @SuppressLint("Doclava125")
      public void clearAccounts() {
          try {
              if (isServiceConnected()) {
                  getTelecomService().clearAccounts(mContext.getPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#clearAccounts", e);
          }
      }
  
      /**
       * Remove all Accounts that belong to the specified package from the system.
       * @hide
       */
      public void clearAccountsForPackage(String packageName) {
          try {
              if (isServiceConnected() && !TextUtils.isEmpty(packageName)) {
                  getTelecomService().clearAccounts(packageName);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#clearAccountsForPackage", e);
          }
      }
  
  
      /**
       * @deprecated - Use {@link TelecomManager#getDefaultDialerPackage} to directly access
       *         the default dialer's package name instead.
       * @hide
       */
      @SystemApi
      @SuppressLint("Doclava125")
      public ComponentName getDefaultPhoneApp() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getDefaultPhoneApp();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to get the default phone app.", e);
          }
          return null;
      }
  
      /**
       * Used to determine the currently selected default dialer package.
       *
       * @return package name for the default dialer package or null if no package has been
       *         selected as the default dialer.
       */
      public String getDefaultDialerPackage() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getDefaultDialerPackage();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to get the default dialer package name.", e);
          }
          return null;
      }
  
      /**
       * Used to set the default dialer package.
       *
       * @param packageName to set the default dialer to, or {@code null} if the system provided
       *                    dialer should be used instead.
       *
       * @result {@code true} if the default dialer was successfully changed, {@code false} if
       *         the specified package does not correspond to an installed dialer, or is already
       *         the default dialer.
       *
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE}
       * Requires permission: {@link android.Manifest.permission#WRITE_SECURE_SETTINGS}
       *
       * @hide
       * @deprecated Use
       * {@link android.app.role.RoleManager#addRoleHolderAsUser(String, String, int, UserHandle,
       * Executor, java.util.function.Consumer)} instead.
       * @removed
       */
      @SystemApi
      @Deprecated
      @RequiresPermission(allOf = {
              android.Manifest.permission.MODIFY_PHONE_STATE,
              android.Manifest.permission.WRITE_SECURE_SETTINGS})
      public boolean setDefaultDialer(@Nullable String packageName) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().setDefaultDialer(packageName);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to set the default dialer.", e);
          }
          return false;
      }
  
      /**
       * Determines the package name of the system-provided default phone app.
       *
       * @return package name for the system dialer package or {@code null} if no system dialer is
       *         preloaded.
       */
      public @Nullable String getSystemDialerPackage() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getSystemDialerPackage();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to get the system dialer package name.", e);
          }
          return null;
      }
  
      /**
       * Return whether a given phone number is the configured voicemail number for a
       * particular phone account.
       *
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @param accountHandle The handle for the account to check the voicemail number against
       * @param number The number to look up.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public boolean isVoiceMailNumber(PhoneAccountHandle accountHandle, String number) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().isVoiceMailNumber(accountHandle, number,
                          mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException calling ITelecomService#isVoiceMailNumber.", e);
          }
          return false;
      }
  
      /**
       * Return the voicemail number for a given phone account.
       *
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @param accountHandle The handle for the phone account.
       * @return The voicemail number for the phone account, and {@code null} if one has not been
       *         configured.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public String getVoiceMailNumber(PhoneAccountHandle accountHandle) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getVoiceMailNumber(accountHandle,
                          mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException calling ITelecomService#hasVoiceMailNumber.", e);
          }
          return null;
      }
  
      /**
       * Return the line 1 phone number for given phone account.
       *
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @param accountHandle The handle for the account retrieve a number for.
       * @return A string representation of the line 1 phone number.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public String getLine1Number(PhoneAccountHandle accountHandle) {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getLine1Number(accountHandle,
                          mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException calling ITelecomService#getLine1Number.", e);
          }
          return null;
      }
  
      /**
       * Returns whether there is an ongoing phone call (can be in dialing, ringing, active or holding
       * states) originating from either a manager or self-managed {@link ConnectionService}.
       * <p>
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @return {@code true} if there is an ongoing call in either a managed or self-managed
       *      {@link ConnectionService}, {@code false} otherwise.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public boolean isInCall() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().isInCall(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException calling isInCall().", e);
          }
          return false;
      }
  
      /**
       * Returns whether there is an ongoing call originating from a managed
       * {@link ConnectionService}.  An ongoing call can be in dialing, ringing, active or holding
       * states.
       * <p>
       * If you also need to know if there are ongoing self-managed calls, use {@link #isInCall()}
       * instead.
       * <p>
       * Requires permission: {@link android.Manifest.permission#READ_PHONE_STATE}
       *
       * @return {@code true} if there is an ongoing call in a managed {@link ConnectionService},
       *      {@code false} otherwise.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public boolean isInManagedCall() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().isInManagedCall(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException calling isInManagedCall().", e);
          }
          return false;
      }
  
      /**
       * Returns one of the following constants that represents the current state of Telecom:
       *
       * {@link TelephonyManager#CALL_STATE_RINGING}
       * {@link TelephonyManager#CALL_STATE_OFFHOOK}
       * {@link TelephonyManager#CALL_STATE_IDLE}
       *
       * Note that this API does not require the
       * {@link android.Manifest.permission#READ_PHONE_STATE} permission. This is intentional, to
       * preserve the behavior of {@link TelephonyManager#getCallState()}, which also did not require
       * the permission.
       *
       * Takes into consideration both managed and self-managed calls.
       *
       * @hide
       */
      @SystemApi
      public @TelephonyManager.CallState int getCallState() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getCallState();
              }
          } catch (RemoteException e) {
              Log.d(TAG, "RemoteException calling getCallState().", e);
          }
          return TelephonyManager.CALL_STATE_IDLE;
      }
  
      /**
       * Returns whether there currently exists is a ringing incoming-call.
       *
       * @return {@code true} if there is a managed or self-managed ringing call.
       * @hide
       */
      @SystemApi
      @RequiresPermission(anyOf = {
              android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE,
              android.Manifest.permission.READ_PHONE_STATE
      })
      public boolean isRinging() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().isRinging(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to get ringing state of phone app.", e);
          }
          return false;
      }
  
      /**
       * Ends the foreground call on the device.
       * <p>
       * If there is a ringing call, calling this method rejects the ringing call.  Otherwise the
       * foreground call is ended.
       * <p>
       * Requires permission {@link android.Manifest.permission#ANSWER_PHONE_CALLS}.
       * <p>
       * Note: this method CANNOT be used to end ongoing emergency calls and will return {@code false}
       * if an attempt is made to end an emergency call.
       *
       * @return {@code true} if there is a call which will be rejected or terminated, {@code false}
       * otherwise.
       * @deprecated Companion apps for wearable devices should use the {@link InCallService} API
       * instead.  Apps performing call screening should use the {@link CallScreeningService} API
       * instead.
       */
      @RequiresPermission(Manifest.permission.ANSWER_PHONE_CALLS)
      @Deprecated
      public boolean endCall() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().endCall(mContext.getPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#endCall", e);
          }
          return false;
      }
  
      /**
       * If there is a ringing incoming call, this method accepts the call on behalf of the user.
       *
       * If the incoming call is a video call, the call will be answered with the same video state as
       * the incoming call requests.  This means, for example, that an incoming call requesting
       * {@link VideoProfile#STATE_BIDIRECTIONAL} will be answered, accepting that state.
       *
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE} or
       * {@link android.Manifest.permission#ANSWER_PHONE_CALLS}
       *
       * @deprecated Companion apps for wearable devices should use the {@link InCallService} API
       * instead.
       */
      //TODO: L-release - need to convert all invocation of ITelecmmService#answerRingingCall to use
      // this method (clockwork & gearhead).
      @RequiresPermission(anyOf =
              {Manifest.permission.ANSWER_PHONE_CALLS, Manifest.permission.MODIFY_PHONE_STATE})
      @Deprecated
      public void acceptRingingCall() {
          try {
              if (isServiceConnected()) {
                  getTelecomService().acceptRingingCall(mContext.getPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#acceptRingingCall", e);
          }
      }
  
      /**
       * If there is a ringing incoming call, this method accepts the call on behalf of the user,
       * with the specified video state.
       *
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE} or
       * {@link android.Manifest.permission#ANSWER_PHONE_CALLS}
       *
       * @param videoState The desired video state to answer the call with.
       * @deprecated Companion apps for wearable devices should use the {@link InCallService} API
       * instead.
       */
      @RequiresPermission(anyOf =
              {Manifest.permission.ANSWER_PHONE_CALLS, Manifest.permission.MODIFY_PHONE_STATE})
      @Deprecated
      public void acceptRingingCall(int videoState) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().acceptRingingCallWithVideoState(
                          mContext.getPackageName(), videoState);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#acceptRingingCallWithVideoState", e);
          }
      }
  
      /**
       * Silences the ringer if a ringing call exists.
       * <p>
       * This method can only be relied upon to stop the ringtone for a call if the ringtone has
       * already started playing.  It is intended to handle use-cases such as silencing a ringing call
       * when the user presses the volume button during ringing.
       * <p>
       * If this method is called prior to when the ringtone begins playing, the ringtone will not be
       * silenced.  As such it is not intended as a means to avoid playing of a ringtone.
       * <p>
       * A dialer app which wants to have more control over ringtone playing should declare
       * {@link TelecomManager#METADATA_IN_CALL_SERVICE_RINGING} in the manifest entry for their
       * {@link InCallService} implementation to indicate that the app wants to be responsible for
       * playing the ringtone for all incoming calls.
       * <p>
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE} or that the
       * app fills the dialer role (see {@link #getDefaultDialerPackage()}).
       */
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public void silenceRinger() {
          try {
              if (isServiceConnected()) {
                  getTelecomService().silenceRinger(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Error calling ITelecomService#silenceRinger", e);
          }
      }
  
      /**
       * Returns whether TTY is supported on this device.
       */
      @RequiresPermission(anyOf = {
              android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE,
              android.Manifest.permission.READ_PHONE_STATE
      })
      public boolean isTtySupported() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().isTtySupported(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to get TTY supported state.", e);
          }
          return false;
      }
  
      /**
       * Returns the current TTY mode of the device. For TTY to be on the user must enable it in
       * settings and have a wired headset plugged in.
       * Valid modes are:
       * - {@link TelecomManager#TTY_MODE_OFF}
       * - {@link TelecomManager#TTY_MODE_FULL}
       * - {@link TelecomManager#TTY_MODE_HCO}
       * - {@link TelecomManager#TTY_MODE_VCO}
       * @hide
       */
      @SystemApi
      @TestApi
      @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
      public @TtyMode int getCurrentTtyMode() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().getCurrentTtyMode(mContext.getOpPackageName());
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException attempting to get the current TTY mode.", e);
          }
          return TTY_MODE_OFF;
      }
  
      /**
       * Registers a new incoming call. A {@link ConnectionService} should invoke this method when it
       * has an incoming call. For managed {@link ConnectionService}s, the specified
       * {@link PhoneAccountHandle} must have been registered with {@link #registerPhoneAccount} and
       * the user must have enabled the corresponding {@link PhoneAccount}.  This can be checked using
       * {@link #getPhoneAccount}. Self-managed {@link ConnectionService}s must have
       * {@link android.Manifest.permission#MANAGE_OWN_CALLS} to add a new incoming call.
       * <p>
       * The incoming call you are adding is assumed to have a video state of
       * {@link VideoProfile#STATE_AUDIO_ONLY}, unless the extra value
       * {@link #EXTRA_INCOMING_VIDEO_STATE} is specified.
       * <p>
       * Once invoked, this method will cause the system to bind to the {@link ConnectionService}
       * associated with the {@link PhoneAccountHandle} and request additional information about the
       * call (See {@link ConnectionService#onCreateIncomingConnection}) before starting the incoming
       * call UI.
       * <p>
       * For a managed {@link ConnectionService}, a {@link SecurityException} will be thrown if either
       * the {@link PhoneAccountHandle} does not correspond to a registered {@link PhoneAccount} or
       * the associated {@link PhoneAccount} is not currently enabled by the user.
       * <p>
       * For a self-managed {@link ConnectionService}, a {@link SecurityException} will be thrown if
       * the {@link PhoneAccount} has {@link PhoneAccount#CAPABILITY_SELF_MANAGED} and the calling app
       * does not have {@link android.Manifest.permission#MANAGE_OWN_CALLS}.
       *
       * @param phoneAccount A {@link PhoneAccountHandle} registered with
       *            {@link #registerPhoneAccount}.
       * @param extras A bundle that will be passed through to
       *            {@link ConnectionService#onCreateIncomingConnection}.
       */
      public void addNewIncomingCall(PhoneAccountHandle phoneAccount, Bundle extras) {
          try {
              if (isServiceConnected()) {
                  if (extras != null && extras.getBoolean(EXTRA_IS_HANDOVER) &&
                          mContext.getApplicationContext().getApplicationInfo().targetSdkVersion >
                                  Build.VERSION_CODES.O_MR1) {
                      Log.e("TAG", "addNewIncomingCall failed. Use public api " +
                              "acceptHandover for API > O-MR1");
                      return;
                  }
                  getTelecomService().addNewIncomingCall(
                          phoneAccount, extras == null ? new Bundle() : extras);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException adding a new incoming call: " + phoneAccount, e);
          }
      }
  
      /**
       * Registers a new unknown call with Telecom. This can only be called by the system Telephony
       * service. This is invoked when Telephony detects a new unknown connection that was neither
       * a new incoming call, nor an user-initiated outgoing call.
       *
       * @param phoneAccount A {@link PhoneAccountHandle} registered with
       *            {@link #registerPhoneAccount}.
       * @param extras A bundle that will be passed through to
       *            {@link ConnectionService#onCreateIncomingConnection}.
       * @hide
       */
      @SystemApi
      public void addNewUnknownCall(PhoneAccountHandle phoneAccount, Bundle extras) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().addNewUnknownCall(
                          phoneAccount, extras == null ? new Bundle() : extras);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException adding a new unknown call: " + phoneAccount, e);
          }
      }
  
      /**
       * Processes the specified dial string as an MMI code.
       * MMI codes are any sequence of characters entered into the dialpad that contain a "*" or "#".
       * Some of these sequences launch special behavior through handled by Telephony.
       * This method uses the default subscription.
       * <p>
       * Requires that the method-caller be set as the system dialer app.
       * </p>
       *
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE}
       *
       * @param dialString The digits to dial.
       * @return True if the digits were processed as an MMI code, false otherwise.
       */
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public boolean handleMmi(String dialString) {
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  return service.handlePinMmi(dialString, mContext.getOpPackageName());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#handlePinMmi", e);
              }
          }
          return false;
      }
  
      /**
       * Processes the specified dial string as an MMI code.
       * MMI codes are any sequence of characters entered into the dialpad that contain a "*" or "#".
       * Some of these sequences launch special behavior through handled by Telephony.
       * <p>
       * Requires that the method-caller be set as the system dialer app.
       * </p>
       *
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE}
       *
       * @param accountHandle The handle for the account the MMI code should apply to.
       * @param dialString The digits to dial.
       * @return True if the digits were processed as an MMI code, false otherwise.
       */
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public boolean handleMmi(String dialString, PhoneAccountHandle accountHandle) {
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  return service.handlePinMmiForPhoneAccount(accountHandle, dialString,
                          mContext.getOpPackageName());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#handlePinMmi", e);
              }
          }
          return false;
      }
  
      /**
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE}
       *
       * @param accountHandle The handle for the account to derive an adn query URI for or
       * {@code null} to return a URI which will use the default account.
       * @return The URI (with the content:// scheme) specific to the specified {@link PhoneAccount}
       * for the the content retrieve.
       */
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public Uri getAdnUriForPhoneAccount(PhoneAccountHandle accountHandle) {
          ITelecomService service = getTelecomService();
          if (service != null && accountHandle != null) {
              try {
                  return service.getAdnUriForPhoneAccount(accountHandle, mContext.getOpPackageName());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#getAdnUriForPhoneAccount", e);
              }
          }
          return Uri.parse("content://icc/adn");
      }
  
      /**
       * Removes the missed-call notification if one is present.
       * <p>
       * Requires that the method-caller be set as the system dialer app.
       * </p>
       *
       * Requires permission: {@link android.Manifest.permission#MODIFY_PHONE_STATE}
       */
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public void cancelMissedCallsNotification() {
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  service.cancelMissedCallsNotification(mContext.getOpPackageName());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#cancelMissedCallsNotification", e);
              }
          }
      }
  
      /**
       * Brings the in-call screen to the foreground if there is an ongoing call. If there is
       * currently no ongoing call, then this method does nothing.
       * <p>
       * Requires that the method-caller be set as the system dialer app or have the
       * {@link android.Manifest.permission#READ_PHONE_STATE} permission.
       * </p>
       *
       * @param showDialpad Brings up the in-call dialpad as part of showing the in-call screen.
       */
      @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
      public void showInCallScreen(boolean showDialpad) {
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  service.showInCallScreen(showDialpad, mContext.getOpPackageName());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#showCallScreen", e);
              }
          }
      }
  
      /**
       * Places a new outgoing call to the provided address using the system telecom service with
       * the specified extras.
       *
       * This method is equivalent to placing an outgoing call using {@link Intent#ACTION_CALL},
       * except that the outgoing call will always be sent via the system telecom service. If
       * method-caller is either the user selected default dialer app or preloaded system dialer
       * app, then emergency calls will also be allowed.
       *
       * Placing a call via a managed {@link ConnectionService} requires permission:
       * {@link android.Manifest.permission#CALL_PHONE}
       *
       * Usage example:
       * <pre>
       * Uri uri = Uri.fromParts("tel", "12345", null);
       * Bundle extras = new Bundle();
       * extras.putBoolean(TelecomManager.EXTRA_START_CALL_WITH_SPEAKERPHONE, true);
       * telecomManager.placeCall(uri, extras);
       * </pre>
       *
       * The following keys are supported in the supplied extras.
       * <ul>
       *   <li>{@link #EXTRA_OUTGOING_CALL_EXTRAS}</li>
       *   <li>{@link #EXTRA_PHONE_ACCOUNT_HANDLE}</li>
       *   <li>{@link #EXTRA_START_CALL_WITH_SPEAKERPHONE}</li>
       *   <li>{@link #EXTRA_START_CALL_WITH_VIDEO_STATE}</li>
       * </ul>
       * <p>
       * An app which implements the self-managed {@link ConnectionService} API uses
       * {@link #placeCall(Uri, Bundle)} to inform Telecom of a new outgoing call.  A self-managed
       * {@link ConnectionService} must include {@link #EXTRA_PHONE_ACCOUNT_HANDLE} to specify its
       * associated {@link android.telecom.PhoneAccountHandle}.
       *
       * Self-managed {@link ConnectionService}s require permission
       * {@link android.Manifest.permission#MANAGE_OWN_CALLS}.
       *
       * <p class="note"><strong>Note:</strong> If this method is used to place an emergency call, it
       * is not guaranteed that the call will be placed on the {@link PhoneAccount} provided in
       * the {@link #EXTRA_PHONE_ACCOUNT_HANDLE} extra (if specified) and may be placed on another
       * {@link PhoneAccount} with the {@link PhoneAccount#CAPABILITY_PLACE_EMERGENCY_CALLS}
       * capability, depending on external factors, such as network conditions and Modem/SIM status.
       * </p>
       *
       * @param address The address to make the call to.
       * @param extras Bundle of extras to use with the call.
       */
      @RequiresPermission(anyOf = {android.Manifest.permission.CALL_PHONE,
              android.Manifest.permission.MANAGE_OWN_CALLS})
      public void placeCall(Uri address, Bundle extras) {
          ITelecomService service = getTelecomService();
          if (service != null) {
              if (address == null) {
                  Log.w(TAG, "Cannot place call to empty address.");
              }
              try {
                  service.placeCall(address, extras == null ? new Bundle() : extras,
                          mContext.getOpPackageName());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#placeCall", e);
              }
          }
      }
  
      /**
       * Enables and disables specified phone account.
       *
       * @param handle Handle to the phone account.
       * @param isEnabled Enable state of the phone account.
       * @hide
       */
      @SystemApi
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public void enablePhoneAccount(PhoneAccountHandle handle, boolean isEnabled) {
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  service.enablePhoneAccount(handle, isEnabled);
              } catch (RemoteException e) {
                  Log.e(TAG, "Error enablePhoneAbbount", e);
              }
          }
      }
  
      /**
       * Dumps telecom analytics for uploading.
       *
       * @return
       * @hide
       */
      @SystemApi
      @RequiresPermission(Manifest.permission.DUMP)
      public TelecomAnalytics dumpAnalytics() {
          ITelecomService service = getTelecomService();
          TelecomAnalytics result = null;
          if (service != null) {
              try {
                  result = service.dumpCallAnalytics();
              } catch (RemoteException e) {
                  Log.e(TAG, "Error dumping call analytics", e);
              }
          }
          return result;
      }
  
      /**
       * Creates the {@link Intent} which can be used with {@link Context#startActivity(Intent)} to
       * launch the activity to manage blocked numbers.
       * <p> The activity will display the UI to manage blocked numbers only if
       * {@link android.provider.BlockedNumberContract#canCurrentUserBlockNumbers(Context)} returns
       * {@code true} for the current user.
       */
      public Intent createManageBlockedNumbersIntent() {
          ITelecomService service = getTelecomService();
          Intent result = null;
          if (service != null) {
              try {
                  result = service.createManageBlockedNumbersIntent();
              } catch (RemoteException e) {
                  Log.e(TAG, "Error calling ITelecomService#createManageBlockedNumbersIntent", e);
              }
          }
          return result;
      }
  
      /**
       * Determines whether Telecom would permit an incoming call to be added via the
       * {@link #addNewIncomingCall(PhoneAccountHandle, Bundle)} API for the specified
       * {@link PhoneAccountHandle}.
       * <p>
       * A {@link ConnectionService} may not add a call for the specified {@link PhoneAccountHandle}
       * in the following situations:
       * <ul>
       *     <li>{@link PhoneAccount} does not have property
       *     {@link PhoneAccount#CAPABILITY_SELF_MANAGED} set (i.e. it is a managed
       *     {@link ConnectionService}), and the active or held call limit has
       *     been reached.</li>
       *     <li>There is an ongoing emergency call.</li>
       * </ul>
       *
       * @param phoneAccountHandle The {@link PhoneAccountHandle} the call will be added for.
       * @return {@code true} if telecom will permit an incoming call to be added, {@code false}
       *      otherwise.
       */
      public boolean isIncomingCallPermitted(PhoneAccountHandle phoneAccountHandle) {
          if (phoneAccountHandle == null) {
              return false;
          }
  
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  return service.isIncomingCallPermitted(phoneAccountHandle);
              } catch (RemoteException e) {
                  Log.e(TAG, "Error isIncomingCallPermitted", e);
              }
          }
          return false;
      }
  
      /**
       * Determines whether Telecom would permit an outgoing call to be placed via the
       * {@link #placeCall(Uri, Bundle)} API for the specified {@link PhoneAccountHandle}.
       * <p>
       * A {@link ConnectionService} may not place a call for the specified {@link PhoneAccountHandle}
       * in the following situations:
       * <ul>
       *     <li>{@link PhoneAccount} does not have property
       *     {@link PhoneAccount#CAPABILITY_SELF_MANAGED} set (i.e. it is a managed
       *     {@link ConnectionService}), and the active, held or ringing call limit has
       *     been reached.</li>
       *     <li>{@link PhoneAccount} has property {@link PhoneAccount#CAPABILITY_SELF_MANAGED} set
       *     (i.e. it is a self-managed {@link ConnectionService} and there is an ongoing call in
       *     another {@link ConnectionService}.</li>
       *     <li>There is an ongoing emergency call.</li>
       * </ul>
       *
       * @param phoneAccountHandle The {@link PhoneAccountHandle} the call will be added for.
       * @return {@code true} if telecom will permit an outgoing call to be placed, {@code false}
       *      otherwise.
       */
      public boolean isOutgoingCallPermitted(PhoneAccountHandle phoneAccountHandle) {
          ITelecomService service = getTelecomService();
          if (service != null) {
              try {
                  return service.isOutgoingCallPermitted(phoneAccountHandle);
              } catch (RemoteException e) {
                  Log.e(TAG, "Error isOutgoingCallPermitted", e);
              }
          }
          return false;
      }
  
      /**
       * Called by an app to indicate that it wishes to accept the handover of an ongoing call to a
       * {@link PhoneAccountHandle} it defines.
       * <p>
       * A call handover is the process where an ongoing call is transferred from one app (i.e.
       * {@link ConnectionService} to another app.  The user could, for example, choose to continue a
       * mobile network call in a video calling app.  The mobile network call via the Telephony stack
       * is referred to as the source of the handover, and the video calling app is referred to as the
       * destination.
       * <p>
       * When considering a handover scenario the <em>initiating</em> device is where a user initiated
       * the handover process (e.g. by calling {@link android.telecom.Call#handoverTo(
       * PhoneAccountHandle, int, Bundle)}, and the other device is considered the <em>receiving</em>
       * device.
       * <p>
       * For a full discussion of the handover process and the APIs involved, see
       * {@link android.telecom.Call#handoverTo(PhoneAccountHandle, int, Bundle)}.
       * <p>
       * This method is called from the <em>receiving</em> side of a handover to indicate a desire to
       * accept the handover of an ongoing call to another {@link ConnectionService} identified by
       * {@link PhoneAccountHandle} destAcct. For managed {@link ConnectionService}s, the specified
       * {@link PhoneAccountHandle} must have been registered with {@link #registerPhoneAccount} and
       * the user must have enabled the corresponding {@link PhoneAccount}.  This can be checked using
       * {@link #getPhoneAccount}. Self-managed {@link ConnectionService}s must have
       * {@link android.Manifest.permission#MANAGE_OWN_CALLS} to handover a call to it.
       * <p>
       * Once invoked, this method will cause the system to bind to the {@link ConnectionService}
       * associated with the {@link PhoneAccountHandle} destAcct and call
       * (See {@link ConnectionService#onCreateIncomingHandoverConnection}).
       * <p>
       * For a managed {@link ConnectionService}, a {@link SecurityException} will be thrown if either
       * the {@link PhoneAccountHandle} destAcct does not correspond to a registered
       * {@link PhoneAccount} or the associated {@link PhoneAccount} is not currently enabled by the
       * user.
       * <p>
       * For a self-managed {@link ConnectionService}, a {@link SecurityException} will be thrown if
       * the calling app does not have {@link android.Manifest.permission#MANAGE_OWN_CALLS}.
       *
       * @param srcAddr The {@link android.net.Uri} of the ongoing call to handover to the caller’s
       *                {@link ConnectionService}.
       * @param videoState Video state after the handover.
       * @param destAcct The {@link PhoneAccountHandle} registered to the calling package.
       */
      public void acceptHandover(Uri srcAddr, @VideoProfile.VideoState int videoState,
              PhoneAccountHandle destAcct) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().acceptHandover(srcAddr, videoState, destAcct);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException acceptHandover: " + e);
          }
      }
  
      /**
       * Determines if there is an ongoing emergency call.  This can be either an outgoing emergency
       * call, as identified by the dialed number, or because a call was identified by the network
       * as an emergency call.
       * @return {@code true} if there is an ongoing emergency call, {@code false} otherwise.
       * @hide
       */
      @SystemApi
      @TestApi
      @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
      public boolean isInEmergencyCall() {
          try {
              if (isServiceConnected()) {
                  return getTelecomService().isInEmergencyCall();
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException isInEmergencyCall: " + e);
              return false;
          }
          return false;
      }
  
      /**
       * Handles {@link Intent#ACTION_CALL} intents trampolined from UserCallActivity.
       * @param intent The {@link Intent#ACTION_CALL} intent to handle.
       * @hide
       */
      public void handleCallIntent(Intent intent) {
          try {
              if (isServiceConnected()) {
                  getTelecomService().handleCallIntent(intent);
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException handleCallIntent: " + e);
          }
      }
  
      private ITelecomService getTelecomService() {
          if (mTelecomServiceOverride != null) {
              return mTelecomServiceOverride;
          }
          return ITelecomService.Stub.asInterface(ServiceManager.getService(Context.TELECOM_SERVICE));
      }
  
      private boolean isServiceConnected() {
          boolean isConnected = getTelecomService() != null;
          if (!isConnected) {
              Log.w(TAG, "Telecom Service not found.");
          }
          return isConnected;
      }
  }
  