Android版的MediaPlayer不播放声音在某些设备上 [英] Android MediaPlayer not playing sound on some devices

问题描述

我做了一个简单的警报蜂鸣我的应用程序。但问题是，声音在有些设备和其他一些未播放

I have made a simple alert beep for my application. But the problem is that the sound is played on some devices and in some others not.

样品code如下：

public void audioPlayer() { // leshon tingull kur ka kolision //Armando 8/7/2013
        MediaPlayer beep_alert = MediaPlayer.create(Maps.this,R.raw.double_beep);
        try {
            beep_alert.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

有显示，它只是不例如打不出误差的Nexus 4 ，但它起着确定在的Nexus 7 。

There is no error shown, it just don play for example nexus 4, but it plays ok in nexus 7.

这是怎么回事了？

该double_beep是一个MP3文件。

The double_beep is a mp3 file.

在此先感谢...

推荐答案

请确保该卷起来，否则你不会听到任何声音。

Make sure the volume is up, otherwise you won't hear anything.

通常它不是真的建议编程调高音量，无需任何用户输入 - 如果量下来它通常是通过在首位用户行为

Generally it's not really advised to turn the volume up programmatically without any user input - if the volume is down it's usually through user action in the first place.

但这里是你如何能做到这一点：

But here's how you can do it:

AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
am.setStreamVolume(AudioManager.STREAM_MUSIC, am.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);

这将最大输出 STREAM_MUSIC 。还有许多其他的方式来控制/音量变化

This will max out STREAM_MUSIC. There are many other ways to control/change volume.

有一个读通过这个问题，以及以熟悉控制卷： http://developer.android.com/training/managing-audio/volume-playback.html

Have a read through this as well to familiarise yourself with controlling volumes: http://developer.android.com/training/managing-audio/volume-playback.html

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