android 多媒体音频占用情况监听

什么场景适合？

如果你的app有长时间（大于一两秒）使用到音频，比如音乐视频的播放，录音，或者网络软件通话。这些场景在音频被占用时，你是需要做适当处理或暂停，或退出，或降低音量；在音频被其他软件释放时，再及时恢复app状态。

本文章的bug：部分手机可以监听音频被占用的情况，但是监听不到释放的情况，导致恢复app状态的动作不能执行（在这样的手机上发现其他app也无法恢复状态—>疑是系统释放了）。

下面的案例没有正儿八经使用音频，具体使用只需要实现最底下的四个方法即可。

其实对音频的控制只做app占用的情况还不够全面，应该加上对电话状态的监听才全面,请看最下面一段代码

注意点：

1.有版本的区别

2.type最好使用music，这是恢复播放比较好的一种类型了

public class SoftCallListenerActivity extends AppCompatActivity implements AudioManager.OnAudioFocusChangeListener {public static final String TAG = "SoftCallListenerActivity";AppCompatTextView textView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_solf_call_listener);textView = findViewById(R.id.atv);if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {audioListener();} else {audioListenerD26();}}AudioManager audioManager;AudioAttributes playbackAttributes;AudioFocusRequest focusRequest;final Object focusLock = new Object();private void audioListenerD26() {audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);int result = audioManager.requestAudioFocus(this,AudioManager.STREAM_MUSIC,AudioManager.AUDIOFOCUS_GAIN);if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {playbackNow();}}@RequiresApi(api = Build.VERSION_CODES.O)private void audioListener() {audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);playbackAttributes = new AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_GAME).setContentType(AudioAttributes.CONTENT_TYPE_MUSIC).build();focusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN).setAudioAttributes(playbackAttributes).setAcceptsDelayedFocusGain(true).setOnAudioFocusChangeListener(this, handler).build();request();}@Overrideprotected void onResume() {super.onResume();Logs.w(TAG, "onResume:  request" );if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {request();}}@RequiresApi(api = Build.VERSION_CODES.O)private void request(){int res = audioManager.requestAudioFocus(focusRequest);synchronized (focusLock) {if (res == AudioManager.AUDIOFOCUS_REQUEST_FAILED) {playbackNowAuthorized = false;} else if (res == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {playbackNowAuthorized = true;playbackNow();} else if (res == AudioManager.AUDIOFOCUS_REQUEST_DELAYED) {playbackDelayed = true;playbackNowAuthorized = false;}}}Handler handler = new Handler(Looper.getMainLooper()) {@Overridepublic void handleMessage(Message msg) {Logs.w(TAG, "handleMessage:" + msg.what);}};boolean playbackDelayed = false;boolean playbackNowAuthorized = false;boolean resumeOnFocusGain = false;@Overridepublic void onAudioFocusChange(int focusChange) {Logs.w(TAG, "onAudioFocusChange:" + focusChange);switch (focusChange) {case AudioManager.AUDIOFOCUS_GAIN:if (playbackDelayed || resumeOnFocusGain) {synchronized (focusLock) {playbackDelayed = false;resumeOnFocusGain = false;}playbackNow();}break;case AudioManager.AUDIOFOCUS_LOSS:synchronized (focusLock) {resumeOnFocusGain = false;playbackDelayed = false;}pausePlayback();break;case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:synchronized (focusLock) {resumeOnFocusGain = true;playbackDelayed = false;}pausePlayback();break;case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:playDependsYourDear();break;}}private void playDependsYourDear() {Logs.w(TAG, "playDependsYourDear");}private void playbackNow() {Logs.w(TAG, "playbackNow");}private void pausePlayback() {Logs.w(TAG, "pausePlayback");}/***当app的音频使用完毕，应该主动释放，这样其他app才能及时响应*/private void playComplete() {Logs.w(TAG, "playComplete");audioManager.abandonAudioFocus(this);}
}

private void telephony() {if (mTelephonyManager == null)mTelephonyManager = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);mPanelBroadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (TelephonyManager.ACTION_PHONE_STATE_CHANGED.equals(action)) {try {JSONObject jsonObject = new JSONObject();int state = mTelephonyManager.getCallState();switch (state) {case TelephonyManager.CALL_STATE_IDLE:// 电话挂断 Logs.w(TAG, "电话挂断..."); break;case TelephonyManager.CALL_STATE_OFFHOOK: //电话通话的状态 Logs.w(TAG, "正在通话...");break;case TelephonyManager.CALL_STATE_RINGING: //电话响铃的状态 Logs.w(TAG, "电话响铃...");break;}sendMessage(jsonObject.toString());} catch (JSONException e) {e.printStackTrace();}}}};IntentFilter panelFilter = new IntentFilter();panelFilter.addAction(TelephonyManager.ACTION_PHONE_STATE_CHANGED);panelFilter.setPriority(Integer.MAX_VALUE);mContext.registerReceiver(mPanelBroadcastReceiver, panelFilter, null, null);}

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android 多媒体音频占用情况监听

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