如何播放,停止,然后再次使用MediaPlayer播放

时间:2016-04-06 22:50:19

标签: android android-mediaplayer

我的代码:

llBtn = (LinearLayout) findViewById(R.id.button);
llBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //Toast.makeText(MainActivity.this, "LL WAS CLICKED", Toast.LENGTH_SHORT).show();
        //IF AUDIO IS NOT PLAYING... PLAY AUDIO... OTHERWISE... STOP AUDIO
        if (tvPS.getText() == "Stop!") {
            StopAudio();
        }
        else {
            PlayAudio();
        }
    }
});

public void StopAudio() {
    if (mediaPlayer.isPlaying()) {
        stopPlaying(mediaPlayer);
    }
    Toast.makeText(MainActivity.this, "STOPPED", Toast.LENGTH_SHORT).show();
    tvPS.setText("Play!");
}

public void PlayAudio() {
    stopPlaying(mediaPlayer);
    tvPS.setText("Stop!");
    //Toast.makeText(MainActivity.this, "1", Toast.LENGTH_SHORT).show();
    inResId = getResources().getIdentifier("myaudio2" , "raw", getPackageName());

    mediaPlayer = MediaPlayer.create(getBaseContext(), inResId);
    mediaPlayer.start();
    mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            //Toast.makeText(MainActivity.this, "Done", Toast.LENGTH_SHORT).show();
        }
    });
}

private void stopPlaying(MediaPlayer mp) {
    if (mp != null) {
        mp.stop();
        mp.release();
        mp = null;
   }
}

当我播放音频并在中间停止并再次点击播放时,应用程序会崩溃并显示以下logcat:

04-06 18:46:48.383: E/AndroidRuntime(13041): FATAL EXCEPTION: main
04-06 18:46:48.383: E/AndroidRuntime(13041): Process: com.myapp, PID: 13041
04-06 18:46:48.383: E/AndroidRuntime(13041): java.lang.IllegalStateException
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.media.MediaPlayer._stop(Native Method)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.media.MediaPlayer.stop(MediaPlayer.java:1211)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at com.myapp.MainActivity.stopPlaying(MainActivity.java:131)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at com.myapp.MainActivity.PlayAudio(MainActivity.java:83)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at com.myapp.MainActivity$1.onClick(MainActivity.java:52)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.view.View.performClick(View.java:4756)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.view.View$PerformClick.run(View.java:19761)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.os.Handler.handleCallback(Handler.java:739)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.os.Handler.dispatchMessage(Handler.java:95)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.os.Looper.loop(Looper.java:135)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at android.app.ActivityThread.main(ActivityThread.java:5253)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at java.lang.reflect.Method.invoke(Native Method)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at java.lang.reflect.Method.invoke(Method.java:372)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
04-06 18:46:48.383: E/AndroidRuntime(13041):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

如何解决问题。

我希望能够再次播放和停止播放。

1 个答案:

答案 0 :(得分:3)

根据documentationstop()将MediaPlayer置于"停止"州。在此状态下不允许调用start(),因此例外。

从此状态再次播放的唯一方法是拨打prepareprepareAsync,等待onPrepared,最后拨打start()

相反,您可以反复pause()start()

由于您只播放音频,因此更换以下内容可能有意义:

 mp.stop();
 mp.release();

使用:

 mp.pause();
 mp.seekTo(0);

编辑:

我注意到您的PlayAudio创建了MediaPlayer的新实例。如果您将上述解决方案与pause一起使用,则应创建MediaPlayer一次(例如在onStarted中)并且不要将其发布到onStopped