Android(安卓)关闭后台音频播放

import android.media.AudioManager;import android.media.AudioManager.OnAudioFocusChangeListener;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.launcher_activity);//add by song startmAudioManager = (AudioManager)this.getSystemService(AUDIO_SERVICE);//mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);//add by song end}@Overrideprotected void onResume() {super.onResume();mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);//add by song}private OnAudioFocusChangeListener mAudioFocusListener = new OnAudioFocusChangeListener() {public void onAudioFocusChange(int focusChange) {}};

1.通过触发媒体的按钮来操作播放器状态:KeyEvent.KEYCODE_MEDIA_PAUSE

public static void sendMediaKeyCode(Context context, int keyCode) {    AudioManager audioManager= (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);   if (audioManager.isMusicActive()){        KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, keyCode);        Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON);        intent.putExtra(Intent.EXTRA_KEY_EVENT, keyEvent);        context.sendOrderedBroadcast(intent,null);        keyEvent = new KeyEvent(KeyEvent.ACTION_UP, keyCode);        intent = new Intent(Intent.ACTION_MEDIA_BUTTON);        intent.putExtra(Intent.EXTRA_KEY_EVENT, keyEvent);        context.sendOrderedBroadcast(intent,null);    }}

 2.通过AudioManager获取音频焦点AudioFocus，来竞争使用audio做停止播放或者降低声音的处理 
AudioManager am = (AudioManager) mAppContext.getSystemService(Context.AUDIO_SERVICE); 
am.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT); 
AudioManager.AUDIOFOCUS_GAIN：永久获取媒体焦点（播放音乐） 估计音乐播放器使用了此方法，在播放视频时调用，不起作用 
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT 暂时获取焦点 适用于短暂的音频 
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK Duck我们应用跟其他应用共用焦点 我们播放的时候其他音频会降低音量

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