android开发 java.lang.IllegalStateException at android.media.MediaPlayer._prepare(Native Method)

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我是靠谱客的博主刻苦蛋挞，最近开发中收集的这篇文章主要介绍android开发 java.lang.IllegalStateException at android.media.MediaPlayer._prepare(Native Method)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

最近遇到一个问题，我在service里面播放一段音乐时遇到了IllegalStateException异常，代码是这样的：

protected void play() {
System.out.println("play");
mpMediaPlayer = MediaPlayer.create(this, R.raw.dd);
try {
mpMediaPlayer.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
mpMediaPlayer.start();
mpMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {//设置重复播放
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
mpMediaPlayer.start();
mpMediaPlayer.setLooping(true);
}
});
}

error:

08-16 14:47:09.822 21109-23341/com.shangyi.supplier W/System.err: java.lang.IllegalStateException
08-16 14:47:09.822 21109-23341/com.shangyi.supplier W/System.err:
at android.media.MediaPlayer._prepare(Native Method)
08-16 14:47:09.822 21109-23341/com.shangyi.supplier W/System.err:
at android.media.MediaPlayer.prepare(MediaPlayer.java:1193)
08-16 14:47:09.822 21109-23341/com.shangyi.supplier W/System.err:
at com.shangyi.service.SupplierService.play(SupplierService.java:139)
08-16 14:47:09.822 21109-23341/com.shangyi.supplier W/System.err:
at com.shangyi.service.SupplierService$1.run(SupplierService.java:61)
08-16 14:47:09.822 21109-23341/com.shangyi.supplier W/System.err:
at java.lang.Thread.run(Thread.java:833)

虽然也能播放，但是有异常不解决心里不爽，找了原因，说是java里面的mediaplayer对象的状态和native的对象状态不一致，mediaplayer的isPlaying方法引起的，后来改了一下：

protected void play() {
System.out.println("play");
mpMediaPlayer = MediaPlayer.create(this, R.raw.dd);
try {
//
mpMediaPlayer.prepare();
if(mpMediaPlayer.isPlaying()){
mpMediaPlayer.stop();
mpMediaPlayer.release();
mpMediaPlayer = MediaPlayer.create(this, R.raw.dd);
}
mpMediaPlayer.start();
} catch (IllegalStateException e) {
e.printStackTrace();
}
mpMediaPlayer.start();
mpMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {//设置重复播放
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
mpMediaPlayer.start();
mpMediaPlayer.setLooping(true);
}
});
}