content: /*
   * Copyright (C) 2011 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 com.android.future.usb;
  
  import android.app.PendingIntent;
  import android.content.Context;
  import android.content.Intent;
  import android.hardware.usb.IUsbManager;
  import android.os.IBinder;
  import android.os.ParcelFileDescriptor;
  import android.os.RemoteException;
  import android.os.ServiceManager;
  import android.util.Log;
  
  /**
   * This is a wrapper class for the USB Manager to support USB accessories.
   *
   * <p>You can obtain an instance of this class by calling {@link #getInstance}
   *
   */
  public class UsbManager {
      private static final String TAG = "UsbManager";
  
     /**
       * Broadcast Action:  A broadcast for USB accessory attached event.
       *
       * This intent is sent when a USB accessory is attached.
       * Call {@link #getAccessory(android.content.Intent)} to retrieve the
       * {@link com.google.android.usb.UsbAccessory} for the attached accessory.
       */
      public static final String ACTION_USB_ACCESSORY_ATTACHED =
              "android.hardware.usb.action.USB_ACCESSORY_ATTACHED";
  
     /**
       * Broadcast Action:  A broadcast for USB accessory detached event.
       *
       * This intent is sent when a USB accessory is detached.
       * Call {@link #getAccessory(android.content.Intent)} to retrieve the
       * {@link com.google.android.usb.UsbAccessory} for the attached accessory that was detached.
       */
      public static final String ACTION_USB_ACCESSORY_DETACHED =
              "android.hardware.usb.action.USB_ACCESSORY_DETACHED";
  
      /**
       * Name of extra added to the {@link android.app.PendingIntent}
       * passed into {#requestPermission} or {#requestPermission}
       * containing a boolean value indicating whether the user granted permission or not.
       */
      public static final String EXTRA_PERMISSION_GRANTED = "permission";
  
      private final Context mContext;
      private final IUsbManager mService;
  
      private UsbManager(Context context, IUsbManager service) {
          mContext = context;
          mService = service;
      }
  
      /**
       * Returns a new instance of this class.
       *
       * @param context the caller's {@link android.content.Context}
       * @return UsbManager instance.
       */
      public static UsbManager getInstance(Context context) {
          IBinder b = ServiceManager.getService(Context.USB_SERVICE);
          return new UsbManager(context, IUsbManager.Stub.asInterface(b));
      }
  
      /**
       * Returns the {@link com.google.android.usb.UsbAccessory} for
       * a {@link #ACTION_USB_ACCESSORY_ATTACHED} or {@link #ACTION_USB_ACCESSORY_ATTACHED}
       * broadcast Intent. This can also be used to retrieve the accessory from the result
       * of a call to {#requestPermission}.
       *
       * @return UsbAccessory for the intent.
       */
      public static UsbAccessory getAccessory(Intent intent) {
          android.hardware.usb.UsbAccessory accessory =
              intent.getParcelableExtra(android.hardware.usb.UsbManager.EXTRA_ACCESSORY);
          if (accessory == null) {
              return null;
          } else {
              return new UsbAccessory(accessory);
          }
      }
  
      /**
       * Returns a list of currently attached USB accessories.
       * (in the current implementation there can be at most one)
       *
       * @return list of USB accessories, or null if none are attached.
       */
      public UsbAccessory[] getAccessoryList() {
          try {
              android.hardware.usb.UsbAccessory accessory = mService.getCurrentAccessory();
              if (accessory == null) {
                  return null;
              } else {
                  return new UsbAccessory[] { new UsbAccessory(accessory) };
              }
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException in getAccessoryList" , e);
              return null;
          }
      }
  
      /**
       * Opens a file descriptor for reading and writing data to the USB accessory.
       *
       * @param accessory the USB accessory to open
       * @return file descriptor, or null if the accessor could not be opened.
       */
      public ParcelFileDescriptor openAccessory(UsbAccessory accessory) {
          try {
              return mService.openAccessory(new android.hardware.usb.UsbAccessory(
                      accessory.getManufacturer(),accessory.getModel(),
                      accessory.getDescription(), accessory.getVersion(),
                      accessory.getUri(), accessory.getSerial()));
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException in openAccessory" , e);
              return null;
          }
      }
  
      /**
       * Returns true if the caller has permission to access the accessory.
       * Permission might have been granted temporarily via
       * {@link #requestPermission} or
       * by the user choosing the caller as the default application for the accessory.
       *
       * @param accessory to check permissions for
       * @return true if caller has permission
       */
      public boolean hasPermission(UsbAccessory accessory) {
          try {
              return mService.hasAccessoryPermission(new android.hardware.usb.UsbAccessory(
                      accessory.getManufacturer(),accessory.getModel(),
                      accessory.getDescription(), accessory.getVersion(),
                      accessory.getUri(), accessory.getSerial()));
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException in hasPermission", e);
              return false;
          }
      }
  
      /**
       * Requests temporary permission for the given package to access the accessory.
       * This may result in a system dialog being displayed to the user
       * if permission had not already been granted.
       * Success or failure is returned via the {@link android.app.PendingIntent} pi.
       * The boolean extra {@link #EXTRA_PERMISSION_GRANTED} will be attached to the
       * PendingIntent to indicate success or failure.
       * If successful, this grants the caller permission to access the device only
       * until the device is disconnected.
       *
       * @param accessory to request permissions for
       * @param pi PendingIntent for returning result
       */
      public void requestPermission(UsbAccessory accessory, PendingIntent pi) {
          try {
              mService.requestAccessoryPermission(new android.hardware.usb.UsbAccessory(
                      accessory.getManufacturer(),accessory.getModel(),
                      accessory.getDescription(), accessory.getVersion(),
                      accessory.getUri(), accessory.getSerial()),
                      mContext.getPackageName(), pi);
          } catch (RemoteException e) {
              Log.e(TAG, "RemoteException in requestPermission", e);
          }
      }
  }
  