在Android中悬空音频焦点

Question

我正在开发一款使用音频焦点功能播放TextToSpeech的应用。

正常场景 - 播放音乐 - ＆gt;开始TTS - ＆gt; TTS获得瞬态焦点 - ＆gt;完成 - ＆gt;音乐剧获得焦点。

错误情景 - 播放音乐 - ＆gt;开始TTS - ＆gt; TTS获得瞬态焦点 - >接收电话 - ＆gt; TTS焦点被抛弃 - ＆gt;通话结束 - ＆gt;媒体播放器和TTS都可以大量播放焦点。

有没有其他方法来处理这种情况

下面的

是Focus侦听器代码

 am.requestAudioFocus(afChangeListener,
                            // Use the music stream.
                            AudioManager.STREAM_MUSIC,
                            // Request permanent focus.
                            AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);

和

回调方法

  if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) {
            Log.d("READOUT", "Focus AUDIOFOCUS_LOSS_TRANSIENT " + getTTS().isSpeaking() + "SDK version = " + Build.VERSION.SDK_INT);
            if (getTTS().isSpeaking()) {
                startReadout = true;
                stopReading();
            }
        } else if (focusChange == AudioManager.AUDIOFOCUS_GAIN || focusChange == AudioManager.AUDIOFOCUS_GAIN_TRANSIENT || focusChange == AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK) {
            Log.d("READOUT", "Focus Gain "+ focusChange);
            listnerTTSCallbacks.resumeTTS();
        } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
            Log.e("READOUT", "Focus AUDIOFOCUS_LOSS");
            stopReading();
        }