Question

我的游戏中有一个典型的onAudioFocusChange代码。

@Override
public void onAudioFocusChange(int focusChange) {
    switch (focusChange) {
        case AudioManager.AUDIOFOCUS_GAIN:
            Log.i(TAG,"AUDIOFOCUS_GAIN");
            mHasAudioFocus = requestAudioFocus();
            break;
        case AudioManager.AUDIOFOCUS_LOSS:
            Log.i(TAG,"AUDIOFOCUS_LOSS");
            abandonAudioFocus();
            break;
        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
            Log.i(TAG,"AUDIOFOCUS_LOSS_TRANSIENT");
            abandonAudioFocus();
            break;
        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
            Log.i(TAG,"AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK");
            abandonAudioFocus();
            break;
        default:
            Log.i(TAG,"Unrecognized audiofocus change");
    }

问题是，当 Samsung 手机上出现浮动窗口时，应用程序会收到AUDIOFOCUS_LOSS_TRANSIENT消息，但是当此窗口关闭时，应用程序不会收到任何消息。

以下是相关的日志行：

13:20:53.253   770  7745 I MediaFocusControl:  AudioFocus  requestAudioFocus() from AudioFocus_For_Phone_Ring_And_Calls
13:20:53.253 14499 14499 I com.js.helpers.JSNativeActivity: AUDIOFOCUS_LOSS_TRANSIENT
13:20:53.253 14499 14499 I com.js.helpers.JSNativeActivity: abandonAudioFocus()
13:20:53.253 14499 14499 I JSNativeActivity: onAbandonAudioFocus
13:20:53.253   770  1508 I MediaFocusControl:  AudioFocus  abandonAudioFocus() from android.media.AudioManager$42599770com.js.helpers.JSNativeActivity$4252c788
13:20:53.253   770  1508 I MediaFocusControl: AudioFocus  removeFocusStackEntry(): removing entry for android.media.AudioManager$42599770com.js.helpers.JSNativeActivity$4252c788
13:21:01.383   770  1220 I MediaFocusControl:  AudioFocus  abandonAudioFocus() from AudioFocus_For_Phone_Ring_And_Calls

如何抓住这个窗口的关闭？

Answer 1

关键句是here 注意：如果当前正在进行电话呼叫，系统将不会授予音频焦点（AUDIOFOCUS_REQUEST_FAILED），并且在呼叫结束后应用程序将不会收到AUDIOFOCUS_GAIN。

所以，这是一种预期的行为，我决定创建一个计时器，并在结束时请求音频焦点。

我目前的代码是：

@Override
public void onAudioFocusChange(int focusChange) {
    switch (focusChange) {
        case AudioManager.AUDIOFOCUS_GAIN:
            Log.d(TAG, "AUDIOFOCUS_GAIN");
            mHasAudioFocus = requestAudioFocus();
            break;
        case AudioManager.AUDIOFOCUS_LOSS:
            Log.d(TAG, "AUDIOFOCUS_LOSS");
            abandonAudioFocus();
            break;
        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
            Log.d(TAG, "AUDIOFOCUS_LOSS_TRANSIENT");
            abandonAudioFocus();
            startAudioFocusCountdownTimer(); 
            break;
        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
            Log.d(TAG, "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK");
            abandonAudioFocus();
            startAudioFocusCountdownTimer(); 
            break;
        default:
            Log.d(TAG, "Unrecognized audiofocus change");
    }
}

private void startAudioFocusCountdownTimer() {
     new CountDownTimer(2000, 2000) {
        public void onTick(long millisUntilFinished) {
            // do nothing
        }
        public void onFinish() {
            mHasAudioFocus = requestAudioFocus();
            if (!mHasAudioFocus)
                startAudioFocusCountdownTimer();
        }
    }.start();
}

拨打电话后，AUDIOFOCUS_GAIN无法通过AUDIOFOCUS_LOSS_TRANSIENT拨打电话

1 个答案: