为了播放在线音乐,我在后台做了例外.我无法解决问题.
01-08 09:42:05.199: E/MediaPlayer(16257): Unable to to create media player 01-08 09:42:05.209: W/System.err(16257): java.io.IOException: setDataSource Failed.: status=0x80000000 01-08 09:42:05.229: W/System.err(16257): at android.media.MediaPlayer._setDataSource(Native Method) 01-08 09:42:05.229: W/System.err(16257): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1000) 01-08 09:42:05.229: W/System.err(16257): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:960) 01-08 09:42:05.229: W/System.err(16257): at com.example.audioplayer.MainActivity$Player.doInBackground(MainActivity.java:89) 01-08 09:42:05.229: W/System.err(16257): at com.example.audioplayer.MainActivity$Player.doInBackground(MainActivity.java:1) 01-08 09:42:05.229: W/System.err(16257): at android.os.AsyncTask$2.call(AsyncTask.java:287) 01-08 09:42:05.229: W/System.err(16257): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 01-08 09:42:05.229: W/System.err(16257): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 01-08 09:42:05.229: W/System.err(16257): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 01-08 09:42:05.239: W/System.err(16257): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 01-08 09:42:05.239: W/System.err(16257): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 01-08 09:42:05.239: W/System.err(16257): at java.lang.Thread.run(Thread.java:856) 01-08 09:42:05.389: D/Prepared(16257): //false 01-08 09:42:05.389: E/MediaPlayer(16257): start called in state 1 01-08 09:42:05.389: E/MediaPlayer(16257): error (-38,0) 01-08 09:42:05.449: E/MediaPlayer(16257): Error (-38,0)
这是代码：
public class MainActivity extends Activity {
private Button btn;
/**
* help to toggle between play and pause.
*/
private boolean playPause;
private MediaPlayer mediaPlayer;
/**
* remain false till media is not completed,inside OnCompletionListener make it true.
*/
private boolean intialStage = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button1);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
btn.setOnClickListener(pausePlay);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main,menu);
return true;
}
private OnClickListener pausePlay = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
if (!playPause) {
btn.setBackgroundResource(R.drawable.button_pause);
if (intialStage)
new Player()
.execute("http://www.virginmegastore.me/Library/Music/CD_001214/Tracks/Track1.mp3");
else {
if (!mediaPlayer.isPlaying())
mediaPlayer.start();
}
playPause = true;
} else {
btn.setBackgroundResource(R.drawable.button_play);
if (mediaPlayer.isPlaying())
mediaPlayer.pause();
playPause = false;
}
}
};
/**
* preparing mediaplayer will take sometime to buffer the content so prepare it inside the background thread and starting it on UI thread.
* @author piyush
*
*/
class Player extends AsyncTask<String,Void,Boolean> {
private ProgressDialog progress;
@Override
protected Boolean doInBackground(String... params) {
// TODO Auto-generated method stub
Boolean prepared;
try {
mediaPlayer.setDataSource(params[0]);//line 89
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
intialStage = true;
playPause=false;
btn.setBackgroundResource(R.drawable.button_play);
mediaPlayer.stop();
mediaPlayer.reset();
}
});
mediaPlayer.prepare();
prepared = true;
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
Log.d("IllegarArgument",e.getMessage());
prepared = false;
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
prepared = false;
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
prepared = false;
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
prepared = false;
e.printStackTrace();
}
return prepared;
}
@Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (progress.isShowing()) {
progress.cancel();
}
Log.d("Prepared","//" + result);
mediaPlayer.start();
intialStage = false;
}
public Player() {
progress = new ProgressDialog(MainActivity.this);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
this.progress.setMessage("Buffering...");
this.progress.show();
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
if (mediaPlayer != null) {
mediaPlayer.reset();
mediaPlayer.release();
mediaPlayer = null;
}
}
}
链接是正确的.我已经提到了第89行产生的异常.请看那里出了什么问题.
提前致谢…
解决方法
您不需要编写自己的AsyncTask来处理这个问题,MediaPlayer类已经有一个PrepareAsync方法,它将为您处理后台加载.
尝试这样的事情：
package com.mypackage.test; import android.app.Activity; import android.media.AudioManager; import android.media.MediaPlayer; import android.os.Bundle; import android.view.View; import android.widget.Button; import java.io.IOException; public class MainActivity extends Activity { private Button btn; private MediaPlayer mediaPlayer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn = (Button) findViewById(R.id.button1); setVolumeControlStream(AudioManager.STREAM_MUSIC); mediaPlayer = new MediaPlayer(); mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); try { mediaPlayer.setDataSource("http://www.virginmegastore.me/Library/Music/CD_001214/Tracks/Track1.mp3"); mediaPlayer.prepareAsync(); mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { mediaPlayer.start(); } }); } catch (IOException e) { e.printStackTrace(); } btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (mediaPlayer.isPlaying()) { mediaPlayer.pause(); } else { mediaPlayer.start(); } } }); } }
我也为了自己的缘故简化了一些代码.
另外,不要忘记在清单中包含INTERNET权限：
< uses-permission android：name =“android.permission.INTERNET”/>
