android 多媒体音频占用情况监听

2024-07-17 05:16| 来源: 网络整理| 查看: 265

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; @Override protected 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(); } @Override protected 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()) { @Override public void handleMessage(Message msg) { Logs.w(TAG, "handleMessage:" + msg.what); } }; boolean playbackDelayed = false; boolean playbackNowAuthorized = false; boolean resumeOnFocusGain = false; @Override public 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() { @Override public 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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