Question

在文字转语音系统说出短语的同时，我试图让音频播放器静音。正如预期的那样，audiomanager在请求音频焦点时减小音量，但是当调用abandonAudioFocus时，音量不会被恢复，并且不会调用abandonAudioFocus的回调。这是我的代码：

private class SpeakRunnable implements Runnable {
    String mText;

    public SpeakRunnable(String text) {
        mText = text;
    }

    @Override
    public void run() {
        stream_volume = am.getStreamVolume(AudioManager.STREAM_MUSIC);
        am.requestAudioFocus(new OnAudioFocusChangeListener() {
            @Override
            public void onAudioFocusChange(int focusChange) {
                  //Check if focus granted
                  .....
                  HashMap<String, String> params = new HashMap<String, String>();
                  params.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, "none");
                  talker.speak(mText, TextToSpeech.QUEUE_ADD, params);
            }
        },
        AudioManager.STREAM_MUSIC,
        AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK);

    }
}

和

talker.setOnUtteranceProgressListener(new UtteranceProgressListener() {

            @Override
            public void onStart(String utteranceId) {

            }

            @Override
            public void onError(String utteranceId) {

            }

            @Override
            public void onDone(String utteranceId) {
                am.abandonAudioFocus(new OnAudioFocusChangeListener() {                     
                    @Override
                    public void onAudioFocusChange(int focusChange) {
                        Log.v(app_id, "CALLBACK");
                    }
                });
            }
        });

有什么想法吗？提前谢谢。

Answer 1

您需要将传递给AudioManager.OnAudioFocusChangeListener的{{1}}传递给abandonAudioFocus。这在the documentation for abandonAudioFocus：

中有所描述

requestAudioFocus

此外，我认为您不应期望在放弃音频焦点时调用您的侦听器中的public int abandonAudioFocus (AudioManager.OnAudioFocusChangeListener l) Parameters l the listener with which focus was requested.方法。当您放弃音频焦点时，已请求音频焦点的其他音频焦点客户端将被通知其已获得焦点。如果您想了解如何在Android内部实施此功能，您可以查看MediaFocusControl source code。

Audiomanager.abandonAudioFocus无法继续播放

1 个答案: