如下，关于android start called in state 0的问题

Question

在安卓手机上运行的时候会出现error：Tag：MediaPlayer Text：start call in state 0。这是什么问题啊，觉得应该不是代码问题，但又找不出问题在哪，求大神指教。代码如下：package com.example.playaudiotest;import java.io.File;import android.app.Activity;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener {private Button play;private Button pause;private Button stop;private MediaPlayer mediaPlayer = new MediaPlayer();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);play = (Button) findViewById(R.id.play);pause = (Button) findViewById(R.id.pause);stop = (Button) findViewById(R.id.stop);play.setOnClickListener(this);pause.setOnClickListener(this);stop.setOnClickListener(this);initMediaPlayer();}private void initMediaPlayer() {try {File file = new File(Environment.getExternalStorageDirectory(), "Over the horizon.mp3");mediaPlayer.setDataSource(file.getPath());mediaPlayer.prepare();} catch (Exception e) {e.printStackTrace();}}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.play:if (!mediaPlayer.isPlaying()) {mediaPlayer.start();}break;case R.id.pause:if (mediaPlayer.isPlaying()) {mediaPlayer.pause();}break;case R.id.stop:if (mediaPlayer.isPlaying()) {mediaPlayer.reset();initMediaPlayer();}break;default:break;}}@Overrideprotected void onDestroy() {super.onDestroy();if (mediaPlayer != null) {mediaPlayer.stop();mediaPlayer.release();}}}

Answer 1

protected void onDestroy() {
super.onDestroy();
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
}
}

你把onDestroy中的mediaPlayer.stop();和mediaPlayer.release();放到super.onDestroy()前面试试！

Answer 2

1、确定AndroidManefest.xml中添加了以下权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

2、去应用中手动开启存储控件的这个权限！

虽然第一步添加了权限，但是我的模拟机是7.0的，需要手动开启下权限。这个很重要。