android 播发音频文件 IllegalStateException

android 播放音频文件 IllegalStateException
 private void playMusic(String path){
 System.out.println("path:"+path);
 try {
//重置MediaPlayer
 myMediaPlayer.reset();
 //设置要播放的文件的路径
myMediaPlayer.setDataSource(path);
System.out.println("setDataSource");
if(myMediaPlayer!=null){
System.out.println("myMediaPlayer!=null");
myMediaPlayer.stop();
}
myMediaPlayer.prepare();
System.out.println("prepare");
myMediaPlayer.start();
System.out.println("start");
SBHandler.sendEmptyMessage(1);
System.out.println("path:"+path);
myMediaPlayer.setOnCompletionListener(new OnCompletionListener(){

public void onCompletion(MediaPlayer mp) {
//播放完一首后停止
myMediaPlayer.reset();
SBHandler.removeCallbacks(null);
}

});
} catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException");
e.printStackTrace();
} catch (IllegalStateException e) {
System.out.println("IllegalStateException");
e.printStackTrace();
} catch (IOException e) {
System.out.println("IOException");
e.printStackTrace();
}
 }

执行这段代码的时候直接跳入
catch (IllegalStateException e) {
System.out.println("IllegalStateException");
e.printStackTrace();
} 
应该是停在myMediaPlayer.prepare();这里了  
sos
[解决办法]

if(myMediaPlayer!=null){
System.out.println("myMediaPlayer!=null");
myMediaPlayer.stop();//stop???看下MediaPlayer状态图吧
}

public void play(MediaListItem item) {
resetMediaPlayer();
String path = item.getMediaPath();
if (!SystemUtil.isMediaFileExisted(path)) {
// 删除该文件,播放下一首
}
/** 设置当前播放的媒体文件资源 */
try {
mediaPlayer.setDataSource(path);
mediaPlayer.prepare();
} catch (IllegalArgumentException e) {
CLog.d(String.format("播放%s失败", item.getMediaDisplayName()));
e.printStackTrace();
} catch (SecurityException e) {
CLog.d(String.format("播放%s失败", item.getMediaDisplayName()));
e.printStackTrace();
} catch (IllegalStateException e) {
CLog.d(String.format("播放%s失败", item.getMediaDisplayName()));
e.printStackTrace();
} catch (IOException e) {
CLog.d(String.format("播放%s失败", item.getMediaDisplayName()));
e.printStackTrace();
}

}

/**
 * 重置播放器
 */
private void resetMediaPlayer() {
/* 如果MediaPlayer不为空，将其停止，释放资源并强制置为null */
releaseMediaPlayer();
mediaPlayer = new MediaPlayer();
/* 设置监听事件 */
setMediaPlayerListener();
}

private void setMediaPlayerListener() {
mediaPlayer.setOnErrorListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setOnCompletionListener(this);
}

public void releaseMediaPlayer() {
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}
}

 
 

import java.io.File;

import android.app.Activity;
import android.content.Context;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText nameText;
    private String path;
    private MediaPlayer mediaPlayer;
    private boolean pause;
    private int position;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mediaPlayer = new MediaPlayer();
        nameText = (EditText) this.findViewById(R.id.filename);
        
        TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(new MyPhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);
    }
    
    private final class MyPhoneListener extends PhoneStateListener{
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_RINGING://来电
if(mediaPlayer.isPlaying()) {
position = mediaPlayer.getCurrentPosition();
mediaPlayer.stop();
}
break;

case TelephonyManager.CALL_STATE_IDLE:
if(position>0 && path!=null){
play(position);
position = 0;
}
break;
}
}
    }
    /*
    @Override
protected void onPause() {
if(mediaPlayer.isPlaying()) {
position = mediaPlayer.getCurrentPosition();
mediaPlayer.stop();
}
super.onPause();
}

@Override
protected void onResume() {
if(position>0 && path!=null){
play(position);
position = 0;
}
super.onResume();
}
*/
@Override
protected void onDestroy() {
    mediaPlayer.release();
    mediaPlayer = null;
super.onDestroy();
}

public void mediaplay(View v){
    switch (v.getId()) {
case R.id.playbutton:
String filename = nameText.getText().toString();
File audio = new File(Environment.getExternalStorageDirectory(), filename);
if(audio.exists()){
path = audio.getAbsolutePath();
play(0);
}else{
path = null;
Toast.makeText(getApplicationContext(), R.string.filenoexist, 1).show(); 
 
}
break;

case R.id.pausebutton:
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();//暂停
pause = true;
((Button)v).setText(R.string.continues);
}else{
if(pause){
mediaPlayer.start();//继续播放
pause = false;
((Button)v).setText(R.string.pausebutton);
}
}
break;
case R.id.resetbutton:
if(mediaPlayer.isPlaying()){
mediaPlayer.seekTo(0);//从开始位置播放音乐
}else{
if(path!=null){
play(0);
}
}
break;
case R.id.stopbutton:
if(mediaPlayer.isPlaying()) mediaPlayer.stop();
break;
}
    }

private void play(int position) {
try {
mediaPlayer.reset();//把各项参数恢复到初始状态
mediaPlayer.setDataSource(path);
mediaPlayer.prepare();//进行缓冲
mediaPlayer.setOnPreparedListener(new PrepareListener(position));
} catch (Exception e) {
e.printStackTrace();
}
}

private final class PrepareListener implements OnPreparedListener{
private int position;
public PrepareListener(int position) {
this.position = position;
}

public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();//开始播放
if(position>0) mediaPlayer.seekTo(position);
}
}
}

请参看