content: /*
   * Copyright (C) 2008 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.bluetooth;
  
  import android.Manifest;
  import android.annotation.Nullable;
  import android.annotation.RequiresPermission;
  import android.annotation.SdkConstant;
  import android.annotation.SdkConstant.SdkConstantType;
  import android.annotation.SystemApi;
  import android.annotation.UnsupportedAppUsage;
  import android.content.ComponentName;
  import android.content.Context;
  import android.os.Binder;
  import android.os.Handler;
  import android.os.IBinder;
  import android.os.Looper;
  import android.os.Message;
  import android.os.RemoteException;
  import android.util.Log;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Public API for controlling the Bluetooth Headset Service. This includes both
   * Bluetooth Headset and Handsfree (v1.5) profiles.
   *
   * <p>BluetoothHeadset is a proxy object for controlling the Bluetooth Headset
   * Service via IPC.
   *
   * <p> Use {@link BluetoothAdapter#getProfileProxy} to get
   * the BluetoothHeadset proxy object. Use
   * {@link BluetoothAdapter#closeProfileProxy} to close the service connection.
   *
   * <p> Android only supports one connected Bluetooth Headset at a time.
   * Each method is protected with its appropriate permission.
   */
  public final class BluetoothHeadset implements BluetoothProfile {
      private static final String TAG = "BluetoothHeadset";
      private static final boolean DBG = true;
      private static final boolean VDBG = false;
  
      /**
       * Intent used to broadcast the change in connection state of the Headset
       * profile.
       *
       * <p>This intent will have 3 extras:
       * <ul>
       * <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
       * <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile. </li>
       * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
       * </ul>
       * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
       * {@link #STATE_DISCONNECTED}, {@link #STATE_CONNECTING},
       * {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTING}.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission to
       * receive.
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_CONNECTION_STATE_CHANGED =
              "android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED";
  
      /**
       * Intent used to broadcast the change in the Audio Connection state of the
       * A2DP profile.
       *
       * <p>This intent will have 3 extras:
       * <ul>
       * <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
       * <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile. </li>
       * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
       * </ul>
       * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
       * {@link #STATE_AUDIO_CONNECTED}, {@link #STATE_AUDIO_DISCONNECTED},
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission
       * to receive.
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_AUDIO_STATE_CHANGED =
              "android.bluetooth.headset.profile.action.AUDIO_STATE_CHANGED";
  
      /**
       * Intent used to broadcast the selection of a connected device as active.
       *
       * <p>This intent will have one extra:
       * <ul>
       * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. It can
       * be null if no device is active. </li>
       * </ul>
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission to
       * receive.
       *
       * @hide
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      @UnsupportedAppUsage
      public static final String ACTION_ACTIVE_DEVICE_CHANGED =
              "android.bluetooth.headset.profile.action.ACTIVE_DEVICE_CHANGED";
  
      /**
       * Intent used to broadcast that the headset has posted a
       * vendor-specific event.
       *
       * <p>This intent will have 4 extras and 1 category.
       * <ul>
       * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote Bluetooth Device
       * </li>
       * <li> {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD} - The vendor
       * specific command </li>
       * <li> {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE} - The AT
       * command type which can be one of  {@link #AT_CMD_TYPE_READ},
       * {@link #AT_CMD_TYPE_TEST}, or {@link #AT_CMD_TYPE_SET},
       * {@link #AT_CMD_TYPE_BASIC},{@link #AT_CMD_TYPE_ACTION}. </li>
       * <li> {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS} - Command
       * arguments. </li>
       * </ul>
       *
       * <p> The category is the Company ID of the vendor defining the
       * vendor-specific command. {@link BluetoothAssignedNumbers}
       *
       * For example, for Plantronics specific events
       * Category will be {@link #VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY}.55
       *
       * <p> For example, an AT+XEVENT=foo,3 will get translated into
       * <ul>
       * <li> EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD = +XEVENT </li>
       * <li> EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE = AT_CMD_TYPE_SET </li>
       * <li> EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS = foo, 3 </li>
       * </ul>
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission
       * to receive.
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_VENDOR_SPECIFIC_HEADSET_EVENT =
              "android.bluetooth.headset.action.VENDOR_SPECIFIC_HEADSET_EVENT";
  
      /**
       * A String extra field in {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT}
       * intents that contains the name of the vendor-specific command.
       */
      public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD =
              "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_CMD";
  
      /**
       * An int extra field in {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT}
       * intents that contains the AT command type of the vendor-specific command.
       */
      public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE =
              "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE";
  
      /**
       * AT command type READ used with
       * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
       * For example, AT+VGM?. There are no arguments for this command type.
       */
      public static final int AT_CMD_TYPE_READ = 0;
  
      /**
       * AT command type TEST used with
       * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
       * For example, AT+VGM=?. There are no arguments for this command type.
       */
      public static final int AT_CMD_TYPE_TEST = 1;
  
      /**
       * AT command type SET used with
       * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
       * For example, AT+VGM=<args>.
       */
      public static final int AT_CMD_TYPE_SET = 2;
  
      /**
       * AT command type BASIC used with
       * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
       * For example, ATD. Single character commands and everything following the
       * character are arguments.
       */
      public static final int AT_CMD_TYPE_BASIC = 3;
  
      /**
       * AT command type ACTION used with
       * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
       * For example, AT+CHUP. There are no arguments for action commands.
       */
      public static final int AT_CMD_TYPE_ACTION = 4;
  
      /**
       * A Parcelable String array extra field in
       * {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT} intents that contains
       * the arguments to the vendor-specific command.
       */
      public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS =
              "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_ARGS";
  
      /**
       * The intent category to be used with {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT}
       * for the companyId
       */
      public static final String VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY =
              "android.bluetooth.headset.intent.category.companyid";
  
      /**
       * A vendor-specific command for unsolicited result code.
       */
      public static final String VENDOR_RESULT_CODE_COMMAND_ANDROID = "+ANDROID";
  
      /**
       * A vendor-specific AT command
       *
       * @hide
       */
      public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XAPL = "+XAPL";
  
      /**
       * A vendor-specific AT command
       *
       * @hide
       */
      public static final String VENDOR_SPECIFIC_HEADSET_EVENT_IPHONEACCEV = "+IPHONEACCEV";
  
      /**
       * Battery level indicator associated with
       * {@link #VENDOR_SPECIFIC_HEADSET_EVENT_IPHONEACCEV}
       *
       * @hide
       */
      public static final int VENDOR_SPECIFIC_HEADSET_EVENT_IPHONEACCEV_BATTERY_LEVEL = 1;
  
      /**
       * A vendor-specific AT command
       *
       * @hide
       */
      public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT = "+XEVENT";
  
      /**
       * Battery level indicator associated with {@link #VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT}
       *
       * @hide
       */
      public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT_BATTERY_LEVEL = "BATTERY";
  
      /**
       * Headset state when SCO audio is not connected.
       * This state can be one of
       * {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
       * {@link #ACTION_AUDIO_STATE_CHANGED} intent.
       */
      public static final int STATE_AUDIO_DISCONNECTED = 10;
  
      /**
       * Headset state when SCO audio is connecting.
       * This state can be one of
       * {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
       * {@link #ACTION_AUDIO_STATE_CHANGED} intent.
       */
      public static final int STATE_AUDIO_CONNECTING = 11;
  
      /**
       * Headset state when SCO audio is connected.
       * This state can be one of
       * {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
       * {@link #ACTION_AUDIO_STATE_CHANGED} intent.
       */
  
      /**
       * Intent used to broadcast the headset's indicator status
       *
       * <p>This intent will have 3 extras:
       * <ul>
       * <li> {@link #EXTRA_HF_INDICATORS_IND_ID} - The Assigned number of headset Indicator which
       * is supported by the headset ( as indicated by AT+BIND command in the SLC
       * sequence) or whose value is changed (indicated by AT+BIEV command) </li>
       * <li> {@link #EXTRA_HF_INDICATORS_IND_VALUE} - Updated value of headset indicator. </li>
       * <li> {@link BluetoothDevice#EXTRA_DEVICE} - Remote device. </li>
       * </ul>
       * <p>{@link #EXTRA_HF_INDICATORS_IND_ID} is defined by Bluetooth SIG and each of the indicators
       * are given an assigned number. Below shows the assigned number of Indicator added so far
       * - Enhanced Safety - 1, Valid Values: 0 - Disabled, 1 - Enabled
       * - Battery Level - 2, Valid Values: 0~100 - Remaining level of Battery
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission to receive.
       *
       * @hide
       */
      public static final String ACTION_HF_INDICATORS_VALUE_CHANGED =
              "android.bluetooth.headset.action.HF_INDICATORS_VALUE_CHANGED";
  
      /**
       * A int extra field in {@link #ACTION_HF_INDICATORS_VALUE_CHANGED}
       * intents that contains the assigned number of the headset indicator as defined by
       * Bluetooth SIG that is being sent. Value range is 0-65535 as defined in HFP 1.7
       *
       * @hide
       */
      public static final String EXTRA_HF_INDICATORS_IND_ID =
              "android.bluetooth.headset.extra.HF_INDICATORS_IND_ID";
  
      /**
       * A int extra field in {@link #ACTION_HF_INDICATORS_VALUE_CHANGED}
       * intents that contains the value of the Headset indicator that is being sent.
       *
       * @hide
       */
      public static final String EXTRA_HF_INDICATORS_IND_VALUE =
              "android.bluetooth.headset.extra.HF_INDICATORS_IND_VALUE";
  
      public static final int STATE_AUDIO_CONNECTED = 12;
  
      private static final int MESSAGE_HEADSET_SERVICE_CONNECTED = 100;
      private static final int MESSAGE_HEADSET_SERVICE_DISCONNECTED = 101;
  
      private Context mContext;
      private ServiceListener mServiceListener;
      private volatile IBluetoothHeadset mService;
      private BluetoothAdapter mAdapter;
  
      private final IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
              new IBluetoothStateChangeCallback.Stub() {
                  public void onBluetoothStateChange(boolean up) {
                      if (DBG) Log.d(TAG, "onBluetoothStateChange: up=" + up);
                      if (!up) {
                          doUnbind();
                      } else {
                          doBind();
                      }
                  }
              };
  
      /**
       * Create a BluetoothHeadset proxy object.
       */
      /*package*/ BluetoothHeadset(Context context, ServiceListener l) {
          mContext = context;
          mServiceListener = l;
          mAdapter = BluetoothAdapter.getDefaultAdapter();
  
          IBluetoothManager mgr = mAdapter.getBluetoothManager();
          if (mgr != null) {
              try {
                  mgr.registerStateChangeCallback(mBluetoothStateChangeCallback);
              } catch (RemoteException e) {
                  Log.e(TAG, "", e);
              }
          }
  
          doBind();
      }
  
      private boolean doBind() {
          synchronized (mConnection) {
              if (mService == null) {
                  if (VDBG) Log.d(TAG, "Binding service...");
                  try {
                      return mAdapter.getBluetoothManager().bindBluetoothProfileService(
                              BluetoothProfile.HEADSET, mConnection);
                  } catch (RemoteException e) {
                      Log.e(TAG, "Unable to bind HeadsetService", e);
                  }
              }
          }
          return false;
      }
  
      private void doUnbind() {
          synchronized (mConnection) {
              if (mService != null) {
                  if (VDBG) Log.d(TAG, "Unbinding service...");
                  try {
                      mAdapter.getBluetoothManager().unbindBluetoothProfileService(
                              BluetoothProfile.HEADSET, mConnection);
                  } catch (RemoteException e) {
                      Log.e(TAG, "Unable to unbind HeadsetService", e);
                  } finally {
                      mService = null;
                  }
              }
          }
      }
  
      /**
       * Close the connection to the backing service.
       * Other public functions of BluetoothHeadset will return default error
       * results once close() has been called. Multiple invocations of close()
       * are ok.
       */
      @UnsupportedAppUsage
      /*package*/ void close() {
          if (VDBG) log("close()");
  
          IBluetoothManager mgr = mAdapter.getBluetoothManager();
          if (mgr != null) {
              try {
                  mgr.unregisterStateChangeCallback(mBluetoothStateChangeCallback);
              } catch (RemoteException re) {
                  Log.e(TAG, "", re);
              }
          }
          mServiceListener = null;
          doUnbind();
      }
  
      /**
       * Initiate connection to a profile of the remote bluetooth device.
       *
       * <p> Currently, the system supports only 1 connection to the
       * headset/handsfree profile. The API will automatically disconnect connected
       * devices before connecting.
       *
       * <p> This API returns false in scenarios like the profile on the
       * device is already connected or Bluetooth is not turned on.
       * When this API returns true, it is guaranteed that
       * connection state intent for the profile will be broadcasted with
       * the state. Users can get the connection state of the profile
       * from this intent.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
       * permission.
       *
       * @param device Remote Bluetooth Device
       * @return false on immediate error, true otherwise
       * @hide
       */
      @SystemApi
      @RequiresPermission(android.Manifest.permission.BLUETOOTH_ADMIN)
      public boolean connect(BluetoothDevice device) {
          if (DBG) log("connect(" + device + ")");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.connect(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return false;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * Initiate disconnection from a profile
       *
       * <p> This API will return false in scenarios like the profile on the
       * Bluetooth device is not in connected state etc. When this API returns,
       * true, it is guaranteed that the connection state change
       * intent will be broadcasted with the state. Users can get the
       * disconnection state of the profile from this intent.
       *
       * <p> If the disconnection is initiated by a remote device, the state
       * will transition from {@link #STATE_CONNECTED} to
       * {@link #STATE_DISCONNECTED}. If the disconnect is initiated by the
       * host (local) device the state will transition from
       * {@link #STATE_CONNECTED} to state {@link #STATE_DISCONNECTING} to
       * state {@link #STATE_DISCONNECTED}. The transition to
       * {@link #STATE_DISCONNECTING} can be used to distinguish between the
       * two scenarios.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
       * permission.
       *
       * @param device Remote Bluetooth Device
       * @return false on immediate error, true otherwise
       * @hide
       */
      @SystemApi
      @RequiresPermission(android.Manifest.permission.BLUETOOTH_ADMIN)
      public boolean disconnect(BluetoothDevice device) {
          if (DBG) log("disconnect(" + device + ")");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.disconnect(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return false;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<BluetoothDevice> getConnectedDevices() {
          if (VDBG) log("getConnectedDevices()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.getConnectedDevices();
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return new ArrayList<BluetoothDevice>();
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return new ArrayList<BluetoothDevice>();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
          if (VDBG) log("getDevicesMatchingStates()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.getDevicesMatchingConnectionStates(states);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return new ArrayList<BluetoothDevice>();
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return new ArrayList<BluetoothDevice>();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int getConnectionState(BluetoothDevice device) {
          if (VDBG) log("getConnectionState(" + device + ")");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.getConnectionState(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return BluetoothProfile.STATE_DISCONNECTED;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return BluetoothProfile.STATE_DISCONNECTED;
      }
  
      /**
       * Set priority of the profile
       *
       * <p> The device should already be paired.
       * Priority can be one of {@link BluetoothProfile#PRIORITY_ON} or
       * {@link BluetoothProfile#PRIORITY_OFF},
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
       * permission.
       *
       * @param device Paired bluetooth device
       * @param priority
       * @return true if priority is set, false on error
       * @hide
       */
      @SystemApi
      @RequiresPermission(android.Manifest.permission.BLUETOOTH_ADMIN)
      public boolean setPriority(BluetoothDevice device, int priority) {
          if (DBG) log("setPriority(" + device + ", " + priority + ")");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              if (priority != BluetoothProfile.PRIORITY_OFF
                      && priority != BluetoothProfile.PRIORITY_ON) {
                  return false;
              }
              try {
                  return service.setPriority(device, priority);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return false;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * Get the priority of the profile.
       *
       * <p> The priority can be any of:
       * {@link #PRIORITY_AUTO_CONNECT}, {@link #PRIORITY_OFF},
       * {@link #PRIORITY_ON}, {@link #PRIORITY_UNDEFINED}
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
       *
       * @param device Bluetooth device
       * @return priority of the device
       * @hide
       */
      @UnsupportedAppUsage
      public int getPriority(BluetoothDevice device) {
          if (VDBG) log("getPriority(" + device + ")");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.getPriority(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
                  return PRIORITY_OFF;
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return PRIORITY_OFF;
      }
  
      /**
       * Start Bluetooth voice recognition. This methods sends the voice
       * recognition AT command to the headset and establishes the
       * audio connection.
       *
       * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
       * If this function returns true, this intent will be broadcasted with
       * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_CONNECTING}.
       *
       * <p> {@link #EXTRA_STATE} will transition from
       * {@link #STATE_AUDIO_CONNECTING} to {@link #STATE_AUDIO_CONNECTED} when
       * audio connection is established and to {@link #STATE_AUDIO_DISCONNECTED}
       * in case of failure to establish the audio connection.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
       *
       * @param device Bluetooth headset
       * @return false if there is no headset connected, or the connected headset doesn't support
       * voice recognition, or voice recognition is already started, or audio channel is occupied,
       * or on error, true otherwise
       */
      public boolean startVoiceRecognition(BluetoothDevice device) {
          if (DBG) log("startVoiceRecognition()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.startVoiceRecognition(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * Stop Bluetooth Voice Recognition mode, and shut down the
       * Bluetooth audio path.
       *
       * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
       * If this function returns true, this intent will be broadcasted with
       * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_DISCONNECTED}.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
       *
       * @param device Bluetooth headset
       * @return false if there is no headset connected, or voice recognition has not started,
       * or voice recognition has ended on this headset, or on error, true otherwise
       */
      public boolean stopVoiceRecognition(BluetoothDevice device) {
          if (DBG) log("stopVoiceRecognition()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.stopVoiceRecognition(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * Check if Bluetooth SCO audio is connected.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
       *
       * @param device Bluetooth headset
       * @return true if SCO is connected, false otherwise or on error
       */
      public boolean isAudioConnected(BluetoothDevice device) {
          if (VDBG) log("isAudioConnected()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.isAudioConnected(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
      }
  
      /**
       * Indicates if current platform supports voice dialing over bluetooth SCO.
       *
       * @return true if voice dialing over bluetooth is supported, false otherwise.
       * @hide
       */
      public static boolean isBluetoothVoiceDialingEnabled(Context context) {
          return context.getResources().getBoolean(
                  com.android.internal.R.bool.config_bluetooth_sco_off_call);
      }
  
      /**
       * Get the current audio state of the Headset.
       * Note: This is an internal function and shouldn't be exposed
       *
       * @hide
       */
      @UnsupportedAppUsage
      public int getAudioState(BluetoothDevice device) {
          if (VDBG) log("getAudioState");
          final IBluetoothHeadset service = mService;
          if (service != null && !isDisabled()) {
              try {
                  return service.getAudioState(device);
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
          return BluetoothHeadset.STATE_AUDIO_DISCONNECTED;
      }
  
      /**
       * Sets whether audio routing is allowed. When set to {@code false}, the AG will not route any
       * audio to the HF unless explicitly told to.
       * This method should be used in cases where the SCO channel is shared between multiple profiles
       * and must be delegated by a source knowledgeable
       * Note: This is an internal function and shouldn't be exposed
       *
       * @param allowed {@code true} if the profile can reroute audio, {@code false} otherwise.
       * @hide
       */
      public void setAudioRouteAllowed(boolean allowed) {
          if (VDBG) log("setAudioRouteAllowed");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  service.setAudioRouteAllowed(allowed);
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
      }
  
      /**
       * Returns whether audio routing is allowed. see {@link #setAudioRouteAllowed(boolean)}.
       * Note: This is an internal function and shouldn't be exposed
       *
       * @hide
       */
      public boolean getAudioRouteAllowed() {
          if (VDBG) log("getAudioRouteAllowed");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.getAudioRouteAllowed();
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
          return false;
      }
  
      /**
       * Force SCO audio to be opened regardless any other restrictions
       *
       * @param forced Whether or not SCO audio connection should be forced: True to force SCO audio
       * False to use SCO audio in normal manner
       * @hide
       */
      public void setForceScoAudio(boolean forced) {
          if (VDBG) log("setForceScoAudio " + String.valueOf(forced));
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  service.setForceScoAudio(forced);
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
      }
  
      /**
       * Check if at least one headset's SCO audio is connected or connecting
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
       *
       * @return true if at least one device's SCO audio is connected or connecting, false otherwise
       * or on error
       * @hide
       */
      public boolean isAudioOn() {
          if (VDBG) log("isAudioOn()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.isAudioOn();
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) Log.w(TAG, "Proxy not attached to service");
          return false;
  
      }
  
      /**
       * Initiates a connection of headset audio to the current active device
       *
       * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
       * If this function returns true, this intent will be broadcasted with
       * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_CONNECTING}.
       *
       * <p> {@link #EXTRA_STATE} will transition from
       * {@link #STATE_AUDIO_CONNECTING} to {@link #STATE_AUDIO_CONNECTED} when
       * audio connection is established and to {@link #STATE_AUDIO_DISCONNECTED}
       * in case of failure to establish the audio connection.
       *
       * Note that this intent will not be sent if {@link BluetoothHeadset#isAudioOn()} is true
       * before calling this method
       *
       * @return false if there was some error such as there is no active headset
       * @hide
       */
      @UnsupportedAppUsage
      public boolean connectAudio() {
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.connectAudio();
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
          return false;
      }
  
      /**
       * Initiates a disconnection of HFP SCO audio.
       * Tear down voice recognition or virtual voice call if any.
       *
       * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
       * If this function returns true, this intent will be broadcasted with
       * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_DISCONNECTED}.
       *
       * @return false if audio is not connected, or on error, true otherwise
       * @hide
       */
      @UnsupportedAppUsage
      public boolean disconnectAudio() {
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.disconnectAudio();
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
          return false;
      }
  
      /**
       * Initiates a SCO channel connection as a virtual voice call to the current active device
       * Active handsfree device will be notified of incoming call and connected call.
       *
       * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
       * If this function returns true, this intent will be broadcasted with
       * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_CONNECTING}.
       *
       * <p> {@link #EXTRA_STATE} will transition from
       * {@link #STATE_AUDIO_CONNECTING} to {@link #STATE_AUDIO_CONNECTED} when
       * audio connection is established and to {@link #STATE_AUDIO_DISCONNECTED}
       * in case of failure to establish the audio connection.
       *
       * @return true if successful, false if one of the following case applies
       *  - SCO audio is not idle (connecting or connected)
       *  - virtual call has already started
       *  - there is no active device
       *  - a Telecom managed call is going on
       *  - binder is dead or Bluetooth is disabled or other error
       * @hide
       */
      @RequiresPermission(Manifest.permission.BLUETOOTH_ADMIN)
      @UnsupportedAppUsage
      public boolean startScoUsingVirtualVoiceCall() {
          if (DBG) log("startScoUsingVirtualVoiceCall()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.startScoUsingVirtualVoiceCall();
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
          return false;
      }
  
      /**
       * Terminates an ongoing SCO connection and the associated virtual call.
       *
       * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
       * If this function returns true, this intent will be broadcasted with
       * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_DISCONNECTED}.
       *
       * @return true if successful, false if one of the following case applies
       *  - virtual voice call is not started or has ended
       *  - binder is dead or Bluetooth is disabled or other error
       * @hide
       */
      @RequiresPermission(Manifest.permission.BLUETOOTH_ADMIN)
      @UnsupportedAppUsage
      public boolean stopScoUsingVirtualVoiceCall() {
          if (DBG) log("stopScoUsingVirtualVoiceCall()");
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.stopScoUsingVirtualVoiceCall();
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
          return false;
      }
  
      /**
       * Notify Headset of phone state change.
       * This is a backdoor for phone app to call BluetoothHeadset since
       * there is currently not a good way to get precise call state change outside
       * of phone app.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void phoneStateChanged(int numActive, int numHeld, int callState, String number,
              int type, String name) {
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  service.phoneStateChanged(numActive, numHeld, callState, number, type, name);
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
      }
  
      /**
       * Send Headset of CLCC response
       *
       * @hide
       */
      public void clccResponse(int index, int direction, int status, int mode, boolean mpty,
              String number, int type) {
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  service.clccResponse(index, direction, status, mode, mpty, number, type);
              } catch (RemoteException e) {
                  Log.e(TAG, e.toString());
              }
          } else {
              Log.w(TAG, "Proxy not attached to service");
              if (DBG) Log.d(TAG, Log.getStackTraceString(new Throwable()));
          }
      }
  
      /**
       * Sends a vendor-specific unsolicited result code to the headset.
       *
       * <p>The actual string to be sent is <code>command + ": " + arg</code>. For example, if {@code
       * command} is {@link #VENDOR_RESULT_CODE_COMMAND_ANDROID} and {@code arg} is {@code "0"}, the
       * string <code>"+ANDROID: 0"</code> will be sent.
       *
       * <p>Currently only {@link #VENDOR_RESULT_CODE_COMMAND_ANDROID} is allowed as {@code command}.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
       *
       * @param device Bluetooth headset.
       * @param command A vendor-specific command.
       * @param arg The argument that will be attached to the command.
       * @return {@code false} if there is no headset connected, or if the command is not an allowed
       * vendor-specific unsolicited result code, or on error. {@code true} otherwise.
       * @throws IllegalArgumentException if {@code command} is {@code null}.
       */
      public boolean sendVendorSpecificResultCode(BluetoothDevice device, String command,
              String arg) {
          if (DBG) {
              log("sendVendorSpecificResultCode()");
          }
          if (command == null) {
              throw new IllegalArgumentException("command is null");
          }
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && isValidDevice(device)) {
              try {
                  return service.sendVendorSpecificResultCode(device, command, arg);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) {
              Log.w(TAG, "Proxy not attached to service");
          }
          return false;
      }
  
      /**
       * Select a connected device as active.
       *
       * The active device selection is per profile. An active device's
       * purpose is profile-specific. For example, in HFP and HSP profiles,
       * it is the device used for phone call audio. If a remote device is not
       * connected, it cannot be selected as active.
       *
       * <p> This API returns false in scenarios like the profile on the
       * device is not connected or Bluetooth is not turned on.
       * When this API returns true, it is guaranteed that the
       * {@link #ACTION_ACTIVE_DEVICE_CHANGED} intent will be broadcasted
       * with the active device.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
       * permission.
       *
       * @param device Remote Bluetooth Device, could be null if phone call audio should not be
       * streamed to a headset
       * @return false on immediate error, true otherwise
       * @hide
       */
      @RequiresPermission(android.Manifest.permission.BLUETOOTH_ADMIN)
      @UnsupportedAppUsage
      public boolean setActiveDevice(@Nullable BluetoothDevice device) {
          if (DBG) {
              Log.d(TAG, "setActiveDevice: " + device);
          }
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled() && (device == null || isValidDevice(device))) {
              try {
                  return service.setActiveDevice(device);
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) {
              Log.w(TAG, "Proxy not attached to service");
          }
          return false;
      }
  
      /**
       * Get the connected device that is active.
       *
       * <p>Requires {@link android.Manifest.permission#BLUETOOTH}
       * permission.
       *
       * @return the connected device that is active or null if no device
       * is active.
       * @hide
       */
      @RequiresPermission(android.Manifest.permission.BLUETOOTH)
      @UnsupportedAppUsage
      public BluetoothDevice getActiveDevice() {
          if (VDBG) {
              Log.d(TAG, "getActiveDevice");
          }
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.getActiveDevice();
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) {
              Log.w(TAG, "Proxy not attached to service");
          }
          return null;
      }
  
      /**
       * Check if in-band ringing is currently enabled. In-band ringing could be disabled during an
       * active connection.
       *
       * @return true if in-band ringing is enabled, false if in-band ringing is disabled
       * @hide
       */
      @RequiresPermission(android.Manifest.permission.BLUETOOTH)
      public boolean isInbandRingingEnabled() {
          if (DBG) {
              log("isInbandRingingEnabled()");
          }
          final IBluetoothHeadset service = mService;
          if (service != null && isEnabled()) {
              try {
                  return service.isInbandRingingEnabled();
              } catch (RemoteException e) {
                  Log.e(TAG, Log.getStackTraceString(new Throwable()));
              }
          }
          if (service == null) {
              Log.w(TAG, "Proxy not attached to service");
          }
          return false;
      }
  
      /**
       * Check if in-band ringing is supported for this platform.
       *
       * @return true if in-band ringing is supported, false if in-band ringing is not supported
       * @hide
       */
      public static boolean isInbandRingingSupported(Context context) {
          return context.getResources().getBoolean(
                  com.android.internal.R.bool.config_bluetooth_hfp_inband_ringing_support);
      }
  
      private final IBluetoothProfileServiceConnection mConnection =
              new IBluetoothProfileServiceConnection.Stub() {
          @Override
          public void onServiceConnected(ComponentName className, IBinder service) {
              if (DBG) Log.d(TAG, "Proxy object connected");
              mService = IBluetoothHeadset.Stub.asInterface(Binder.allowBlocking(service));
              mHandler.sendMessage(mHandler.obtainMessage(
                      MESSAGE_HEADSET_SERVICE_CONNECTED));
          }
  
          @Override
          public void onServiceDisconnected(ComponentName className) {
              if (DBG) Log.d(TAG, "Proxy object disconnected");
              doUnbind();
              mHandler.sendMessage(mHandler.obtainMessage(
                      MESSAGE_HEADSET_SERVICE_DISCONNECTED));
          }
      };
  
      @UnsupportedAppUsage
      private boolean isEnabled() {
          return mAdapter.getState() == BluetoothAdapter.STATE_ON;
      }
  
      private boolean isDisabled() {
          return mAdapter.getState() == BluetoothAdapter.STATE_OFF;
      }
  
      private static boolean isValidDevice(BluetoothDevice device) {
          return device != null && BluetoothAdapter.checkBluetoothAddress(device.getAddress());
      }
  
      private static void log(String msg) {
          Log.d(TAG, msg);
      }
  
      private final Handler mHandler = new Handler(Looper.getMainLooper()) {
          @Override
          public void handleMessage(Message msg) {
              switch (msg.what) {
                  case MESSAGE_HEADSET_SERVICE_CONNECTED: {
                      if (mServiceListener != null) {
                          mServiceListener.onServiceConnected(BluetoothProfile.HEADSET,
                                  BluetoothHeadset.this);
                      }
                      break;
                  }
                  case MESSAGE_HEADSET_SERVICE_DISCONNECTED: {
                      if (mServiceListener != null) {
                          mServiceListener.onServiceDisconnected(BluetoothProfile.HEADSET);
                      }
                      break;
                  }
              }
          }
      };
  }
  