android.media.AudioManager#OnAudioFocusChangeListener ( )源码实例Demo

@Override
protected void init(Context context) {
    super.init(context);
    mCoverImage = (ImageView) findViewById(R.id.thumbImage);
    if (mThumbImageViewLayout != null &&
            (mCurrentState == -1 || mCurrentState == CURRENT_STATE_NORMAL || mCurrentState == CURRENT_STATE_ERROR)) {
        mThumbImageViewLayout.setVisibility(VISIBLE);
    }
    onAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
        @Override
        public void onAudioFocusChange(int focusChange) {
            switch (focusChange) {
                case AudioManager.AUDIOFOCUS_GAIN:
                    break;
                case AudioManager.AUDIOFOCUS_LOSS:
                    //todo 判断如果不是外界造成的就不处理
                    break;
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                    //todo 判断如果不是外界造成的就不处理
                    break;
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                    break;
            }
        }
    };
}
 

/**
 * 放弃音频焦点, 使上一个焦点所有者 ( 如果有 ) 接收焦点
 * @param listener 焦点监听事件
 * @return {@code true} success, {@code false} fail
 */
public static boolean abandonAudioFocus(final AudioManager.OnAudioFocusChangeListener listener) {
    AudioManager audioManager = AppUtils.getAudioManager();
    if (audioManager != null) {
        try {
            audioManager.abandonAudioFocus(listener);
            return true;
        } catch (Exception e) {
            LogPrintUtils.eTag(TAG, e, "abandonAudioFocus");
        }
    }
    return false;
}
 

@VisibleForTesting
/* package */ AudioManager.OnAudioFocusChangeListener getFocusListener() {
  return focusListener;
}
 

public void start(AudioManagerEvents audioManagerEvents) {
  LogUtil.d(TAG, "start");
  AppRTCUtils.checkIsOnMainThread(apprtcContext);
  if (amState == AudioManagerState.RUNNING) {
    LogUtil.e(TAG, "AudioManager is already active");
    return;
  }
  amState = AudioManagerState.RUNNING;

  // TODO(henrika): perhaps call new method called preInitAudio() here if UNINITIALIZED.

  LogUtil.d(TAG, "AudioManager starts...");
  this.audioManagerEvents = audioManagerEvents;

  // Store current audio state so we can restore it when stop() is called.
  savedAudioMode = audioManager.getMode();
  savedIsSpeakerPhoneOn = audioManager.isSpeakerphoneOn();
  savedIsMicrophoneMute = audioManager.isMicrophoneMute();
  hasWiredHeadset = hasWiredHeadset();

  // Create an AudioManager.OnAudioFocusChangeListener instance.
  audioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
    // Called on the listener to notify if the audio focus for this listener has been changed.
    // The |focusChange| value indicates whether the focus was gained, whether the focus was lost,
    // and whether that loss is transient, or whether the new focus holder will hold it for an
    // unknown amount of time.
    // TODO(henrika): possibly extend support of handling audio-focus changes. Only contains
    // logging for now.
    @Override
    public void onAudioFocusChange(int focusChange) {
      String typeOfChange = "AUDIOFOCUS_NOT_DEFINED";
      switch (focusChange) {
        case AudioManager.AUDIOFOCUS_GAIN:
          typeOfChange = "AUDIOFOCUS_GAIN";
          break;
        case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT:
          typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT";
          break;
        case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE:
          typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE";
          break;
        case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK:
          typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK";
          break;
        case AudioManager.AUDIOFOCUS_LOSS:
          typeOfChange = "AUDIOFOCUS_LOSS";
          break;
        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
          typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT";
          break;
        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
          typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK";
          break;
        default:
          typeOfChange = "AUDIOFOCUS_INVALID";
          break;
      }
      LogUtil.d(TAG, "onAudioFocusChange: " + typeOfChange);
    }
  };

  // Request audio playout focus (without ducking) and install listener for changes in focus.
  int result = audioManager.requestAudioFocus(audioFocusChangeListener,
      AudioManager.STREAM_VOICE_CALL, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
  if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
    LogUtil.d(TAG, "Audio focus request granted for VOICE_CALL streams");
  } else {
    LogUtil.e(TAG, "Audio focus request failed");
  }

  // Start by setting MODE_IN_COMMUNICATION as default audio mode. It is
  // required to be in this mode when playout and/or recording starts for
  // best possible VoIP performance.
  audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);

  // Always disable microphone mute during a WebRTC call.
  setMicrophoneMute(false);

  // Set initial device states.
  userSelectedAudioDevice = AudioDevice.NONE;
  selectedAudioDevice = AudioDevice.NONE;
  audioDevices.clear();

  // Initialize and start Bluetooth if a BT device is available or initiate
  // detection of new (enabled) BT devices.
  bluetoothManager.start();

  // Do initial selection of audio device. This setting can later be changed
  // either by adding/removing a BT or wired headset or by covering/uncovering
  // the proximity sensor.
  updateAudioDeviceState();

  // Register receiver for broadcast intents related to adding/removing a
  // wired headset.
  registerReceiver(wiredHeadsetReceiver, new IntentFilter(Intent.ACTION_HEADSET_PLUG));
  LogUtil.d(TAG, "AudioManager started");
}
 

@SuppressWarnings("deprecation")
public void start(AudioManagerEvents audioManagerEvents) {
    Log.d(Config.LOGTAG, AppRTCAudioManager.class.getName() + ".start()");
    ThreadUtils.checkIsOnMainThread();
    if (amState == AudioManagerState.RUNNING) {
        Log.e(Config.LOGTAG, "AudioManager is already active");
        return;
    }
    awaitMicrophoneLatch();
    this.audioManagerEvents = audioManagerEvents;
    amState = AudioManagerState.RUNNING;
    // Store current audio state so we can restore it when stop() is called.
    savedIsSpeakerPhoneOn = audioManager.isSpeakerphoneOn();
    savedIsMicrophoneMute = audioManager.isMicrophoneMute();
    hasWiredHeadset = hasWiredHeadset();
    // Create an AudioManager.OnAudioFocusChangeListener instance.
    audioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
        // Called on the listener to notify if the audio focus for this listener has been changed.
        // The |focusChange| value indicates whether the focus was gained, whether the focus was lost,
        // and whether that loss is transient, or whether the new focus holder will hold it for an
        // unknown amount of time.
        // TODO(henrika): possibly extend support of handling audio-focus changes. Only contains
        // logging for now.
        @Override
        public void onAudioFocusChange(int focusChange) {
            final String typeOfChange;
            switch (focusChange) {
                case AudioManager.AUDIOFOCUS_GAIN:
                    typeOfChange = "AUDIOFOCUS_GAIN";
                    break;
                case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT:
                    typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT";
                    break;
                case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE:
                    typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE";
                    break;
                case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK:
                    typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK";
                    break;
                case AudioManager.AUDIOFOCUS_LOSS:
                    typeOfChange = "AUDIOFOCUS_LOSS";
                    break;
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                    typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT";
                    break;
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                    typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK";
                    break;
                default:
                    typeOfChange = "AUDIOFOCUS_INVALID";
                    break;
            }
            Log.d(Config.LOGTAG, "onAudioFocusChange: " + typeOfChange);
        }
    };
    // Request audio playout focus (without ducking) and install listener for changes in focus.
    int result = audioManager.requestAudioFocus(audioFocusChangeListener,
            AudioManager.STREAM_VOICE_CALL, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
    if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
        Log.d(Config.LOGTAG, "Audio focus request granted for VOICE_CALL streams");
    } else {
        Log.e(Config.LOGTAG, "Audio focus request failed");
    }
    // Start by setting MODE_IN_COMMUNICATION as default audio mode. It is
    // required to be in this mode when playout and/or recording starts for
    // best possible VoIP performance.
    audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
    // Always disable microphone mute during a WebRTC call.
    setMicrophoneMute(false);
    // Set initial device states.
    userSelectedAudioDevice = AudioDevice.NONE;
    selectedAudioDevice = AudioDevice.NONE;
    audioDevices.clear();
    // Initialize and start Bluetooth if a BT device is available or initiate
    // detection of new (enabled) BT devices.
    bluetoothManager.start();
    // Do initial selection of audio device. This setting can later be changed
    // either by adding/removing a BT or wired headset or by covering/uncovering
    // the proximity sensor.
    updateAudioDeviceState();
    // Register receiver for broadcast intents related to adding/removing a
    // wired headset.
    registerReceiver(wiredHeadsetReceiver, new IntentFilter(Intent.ACTION_HEADSET_PLUG));
    Log.d(Config.LOGTAG, "AudioManager started");
}
 

@Override
public void onCreate() {
    // The service is being created.
    Utils.logDebug(TAG, "onCreate");
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(CHOICE_NOTIFICATION_ACTION_1);
    intentFilter.addAction(CHOICE_NOTIFICATION_ACTION_2);
    intentFilter.addAction(CHOICE_NOTIFICATION_ACTION_3);
    registerReceiver(mReceiver, intentFilter);

    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

    // Determines the behavior for handling Audio Focus surrender.
    mAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
        @Override
        public void onAudioFocusChange(int focusChange) {
            if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT
                    || focusChange == AudioManager.AUDIOFOCUS_LOSS) {

                if (mTextToSpeech.isSpeaking()) {
                    mTextToSpeech.setOnUtteranceProgressListener(null);
                    mTextToSpeech.stop();
                }

                if (mMediaPlayer.isPlaying()) {
                    mMediaPlayer.stop();
                }

                // Abandon Audio Focus, if it's requested elsewhere.
                mAudioManager.abandonAudioFocus(mAudioFocusChangeListener);

                // Restart the current moment if AudioFocus was lost. Since AudioFocus is only
                // requested away from this application if this application was using it,
                // only Moments that play sound will restart in this way.
                if (mMission != null) {
                    mMission.restartMoment();
                }
            }
        }
    };

    // Asynchronously prepares the TextToSpeech.
    mTextToSpeech = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
        @Override
        public void onInit(int status) {
            if (status == TextToSpeech.SUCCESS) {
                // Check if language is available.
                switch (mTextToSpeech.isLanguageAvailable(DEFAULT_TEXT_TO_SPEECH_LOCALE)) {
                    case TextToSpeech.LANG_AVAILABLE:
                    case TextToSpeech.LANG_COUNTRY_AVAILABLE:
                    case TextToSpeech.LANG_COUNTRY_VAR_AVAILABLE:
                        Utils.logDebug(TAG, "TTS locale supported.");
                        mTextToSpeech.setLanguage(DEFAULT_TEXT_TO_SPEECH_LOCALE);
                        mIsTextToSpeechReady = true;
                        break;
                    case TextToSpeech.LANG_MISSING_DATA:
                        Utils.logDebug(TAG, "TTS missing data, ask for install.");
                        Intent installIntent = new Intent();
                        installIntent.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
                        startActivity(installIntent);
                        break;
                    default:
                        Utils.logDebug(TAG, "TTS local not supported.");
                        break;
                }
            }
        }
    });

    mMediaPlayer = new MediaPlayer();
}
 

@VisibleForTesting
/* package */ AudioManager.OnAudioFocusChangeListener getFocusListener() {
  return focusListener;
}
 

@SuppressWarnings("deprecation")
public void start(AudioManagerEvents audioManagerEvents) {
    Log.d(Config.LOGTAG, AppRTCAudioManager.class.getName() + ".start()");
    ThreadUtils.checkIsOnMainThread();
    if (amState == AudioManagerState.RUNNING) {
        Log.e(Config.LOGTAG, "AudioManager is already active");
        return;
    }
    awaitMicrophoneLatch();
    this.audioManagerEvents = audioManagerEvents;
    amState = AudioManagerState.RUNNING;
    // Store current audio state so we can restore it when stop() is called.
    savedIsSpeakerPhoneOn = audioManager.isSpeakerphoneOn();
    savedIsMicrophoneMute = audioManager.isMicrophoneMute();
    hasWiredHeadset = hasWiredHeadset();
    // Create an AudioManager.OnAudioFocusChangeListener instance.
    audioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
        // Called on the listener to notify if the audio focus for this listener has been changed.
        // The |focusChange| value indicates whether the focus was gained, whether the focus was lost,
        // and whether that loss is transient, or whether the new focus holder will hold it for an
        // unknown amount of time.
        // TODO(henrika): possibly extend support of handling audio-focus changes. Only contains
        // logging for now.
        @Override
        public void onAudioFocusChange(int focusChange) {
            final String typeOfChange;
            switch (focusChange) {
                case AudioManager.AUDIOFOCUS_GAIN:
                    typeOfChange = "AUDIOFOCUS_GAIN";
                    break;
                case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT:
                    typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT";
                    break;
                case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE:
                    typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE";
                    break;
                case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK:
                    typeOfChange = "AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK";
                    break;
                case AudioManager.AUDIOFOCUS_LOSS:
                    typeOfChange = "AUDIOFOCUS_LOSS";
                    break;
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                    typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT";
                    break;
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                    typeOfChange = "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK";
                    break;
                default:
                    typeOfChange = "AUDIOFOCUS_INVALID";
                    break;
            }
            Log.d(Config.LOGTAG, "onAudioFocusChange: " + typeOfChange);
        }
    };
    // Request audio playout focus (without ducking) and install listener for changes in focus.
    int result = audioManager.requestAudioFocus(audioFocusChangeListener,
            AudioManager.STREAM_VOICE_CALL, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
    if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
        Log.d(Config.LOGTAG, "Audio focus request granted for VOICE_CALL streams");
    } else {
        Log.e(Config.LOGTAG, "Audio focus request failed");
    }
    // Start by setting MODE_IN_COMMUNICATION as default audio mode. It is
    // required to be in this mode when playout and/or recording starts for
    // best possible VoIP performance.
    audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
    // Always disable microphone mute during a WebRTC call.
    setMicrophoneMute(false);
    // Set initial device states.
    userSelectedAudioDevice = AudioDevice.NONE;
    selectedAudioDevice = AudioDevice.NONE;
    audioDevices.clear();
    // Initialize and start Bluetooth if a BT device is available or initiate
    // detection of new (enabled) BT devices.
    bluetoothManager.start();
    // Do initial selection of audio device. This setting can later be changed
    // either by adding/removing a BT or wired headset or by covering/uncovering
    // the proximity sensor.
    updateAudioDeviceState();
    // Register receiver for broadcast intents related to adding/removing a
    // wired headset.
    registerReceiver(wiredHeadsetReceiver, new IntentFilter(Intent.ACTION_HEADSET_PLUG));
    Log.d(Config.LOGTAG, "AudioManager started");
}
 

@VisibleForTesting
/* package */ AudioManager.OnAudioFocusChangeListener getFocusListener() {
  return focusListener;
}