android开发 java.lang.IllegalStateException at android.media.MediaPlayer.

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@Overridepublic 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@Overridepublic void onCompletion(MediaPlayer mediaPlayer) {mpMediaPlayer.start();mpMediaPlayer.setLooping(true);}});}

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