Merge "A2DP sink audio focus"

import android.bluetooth.BluetoothDevice;

import android.content.Context;

import android.media.AudioAttributes;

import android.media.AudioFocusRequest;

import android.media.AudioManager;

import android.media.AudioManager.OnAudioFocusChangeListener;

import android.os.Handler;

     * Utility functions.

     */

    private int requestAudioFocus() {

        int focusRequestStatus = mAudioManager.requestAudioFocus(

                mAudioFocusListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

        // Bluetooth A2DP may carry Music, Audio Books, Navigation, or other sounds so mark content

        // type unknown.

        AudioAttributes streamAttributes =

                new AudioAttributes.Builder()

                        .setUsage(AudioAttributes.USAGE_MEDIA)

                        .setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)

                        .build();

        // Bluetooth ducking is handled at the native layer so tell the Audio Manger to notify the

        // focus change listener via .setWillPauseWhenDucked().

        AudioFocusRequest focusRequest =

                new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)

                        .setAudioAttributes(streamAttributes)

                        .setWillPauseWhenDucked(true)

                        .setOnAudioFocusChangeListener(mAudioFocusListener, this)

                        .build();

        int focusRequestStatus = mAudioManager.requestAudioFocus(focusRequest);

        // If the request is granted begin streaming immediately and schedule an upgrade.

        if (focusRequestStatus == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {

            startAvrcpUpdates();