Android MediaPlayer-如何在STREAM_ALARM中播放?

问题描述

我尝试使用以下代码在应用程序中设置媒体播放器的音频流，但是当我这样做时，我在模拟器中听不到声音.如果我没有为播放器设置流，则音频可以正常播放.我确定我使用的是错误的，但无法锻炼，有什么帮助吗?

I've tried settings the audio stream of the media player in my application using the following code but when I do this I hear no sound in the emulator. If I don't set the stream for the player then the audio plays fine. I'm sure I'm using this wrong but cannot workout how, any help?

MediaPlayer player = MediaPlayer.create(getApplicationContext(), R.raw.test_audio);

AudioManager audioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
audioManager.getStreamVolume(AudioManager.STREAM_ALARM);
audioManager.setStreamVolume(AudioManager.STREAM_ALARM, audioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM), AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
player.setAudioStreamType(AudioManager.STREAM_ALARM);
player.start();

注意:我已经向清单中添加了MODIFY_AUDIO_SETTINGS权限.

Note: I've added the MODIFY_AUDIO_SETTINGS permission to my manifest already.

谢谢！

推荐答案

我不知道为什么会发生这种情况，但是下面的代码有效.您应该使用setDataSource()而不是create()设置数据源.

I don't know why this would happen, however the code below works. You should set the data source with setDataSource() instead of with create().

此代码有效:

MediaPlayer mp = new MediaPlayer();
mp.setAudioStreamType(AudioManager.STREAM_ALARM);
mp.setDataSource(this,Uri.parse("android.resource://PACKAGE_NAME/"+R.raw.soundfile));
mp.prepare();
mp.start();

此代码无效起作用:

MediaPlayer mp = MediaPlayer.create(this, R.raw.soundfile);
mp.setAudioStreamType(AudioManager.STREAM_ALARM);
mp.prepare();
mp.start();

这篇关于Android MediaPlayer-如何在STREAM_ALARM中播放?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！