Android录制或播放语音消息时关闭其他媒体播放

1.发送系统广播：

Intent i = new Intent(“com.android.music.musicservicecommand”);

i.putExtra(“command”, “pause”);

context.sendBroadcast(i);

因为其他的播放器不一定注册监听了那个广播，所以大多数情况是不起作用的。

2.通过触发媒体的按钮来操作播放器状态:

KeyEvent.KEYCODE_MEDIA_PAUSE

public static void sendMediaButton(Context context, int keyCode) {

AudioManager audioManager= (AudioManager) context.getSystemService (Context.AUDIO_SERVICE);

//先判断后台是否再播放音乐

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);
}

}

3. 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

后台播放音乐时，项目中播放视频，1方法不起作用，2方法有效 3 暂时获取焦点时，播放视频，音乐停止，退出播放界面，音乐自动播放

4.写一个服务，当第三方播放器打开时 ，开启这个服务，音乐暂停；关闭服务，音乐继续

服务类：

private AudioManager mAm;

private static boolean vIsActive=false;

private MyOnAudioFocusChangeListener mListener;

public class MyOnAudioFocusChangeListener implements OnAudioFocusChangeListener {

@Override

public void onAudioFocusChange(int focusChange) {

// TODO Auto-generated method stub

}

}

public int onStartCommand(Intent intent, int flags, int startId) {

// TODO Auto-generated method stub

Log.d(TAG, “onStartCommand”);

Toast.makeText(getApplicationContext(), “服务已启动”, 0).show();

mAm = (AudioManager) getApplicationContext().getSystemService(
Context.AUDIO_SERVICE);
vIsActive=mAm.isMusicActive();
mListener = new MyOnAudioFocusChangeListener();
if(vIsActive)
{
int result = mAm.requestAudioFocus(mListener,
AudioManager.STREAM_MUSIC,
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);

if (result == AudioMa
4000
nager.AUDIOFOCUS_REQUEST_GRANTED)
{
Log.d(TAG, "requestAudioFocus successfully.");
}
else
{
Log.d(TAG, "requestAudioFocus failed.");
}
}
return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
if(vIsActive)
{
mAm.abandonAudioFocus(mListener);
}
Log.d(TAG, "onDestroy");
}

调用：开始或结束服务

startService(new Intent(MainActivity.this,StartService.class));

stopService(new Intent(MainActivity.this,StartService.class));