android的mediaplayer播放视频，mediaplayer not present如何解决？求大神

u010653906 2015-12-21 10:43:23

代码如下：
package com.example.videoplay;

import java.io.File;
import java.io.IOException;

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MainActivity extends Activity implements OnBufferingUpdateListener,OnCompletionListener, MediaPlayer.OnPreparedListener,SurfaceHolder.Callback {

private MediaPlayer mediaPlayer;
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private int videoWidth;
private int videoHeight;
private String url;

@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
url = Environment.getExternalStorageDirectory() + "/SmartPhoneVideo/VideoAndGPS/20151218140523/1.mp4";
this.surfaceView = (SurfaceView) this.findViewById(R.id.surface);
this.surfaceHolder = this.surfaceView.getHolder();
this.surfaceHolder.addCallback(this);
this.surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

private void playVideo() throws IllegalArgumentException,IllegalStateException, IOException {
this.mediaPlayer = MediaPlayer.create(this, Uri.fromFile(new File(url)), surfaceHolder);
// this.mediaPlayer.setDataSource(url);
// this.mediaPlayer.setDisplay(this.surfaceHolder);
this.mediaPlayer.prepare();
this.mediaPlayer.setOnBufferingUpdateListener(this);
this.mediaPlayer.setOnPreparedListener(this);
this.mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
Log.i("mplayer", ">>>play video");
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
this.playVideo();
} catch (Exception e) {
Log.i("cat", ">>>error", e);
}
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub

}

@Override
public void onPrepared(MediaPlayer mp) {
this.videoWidth = this.mediaPlayer.getVideoWidth();
this.videoHeight = this.mediaPlayer.getVideoHeight();

if (this.videoHeight != 0 && this.videoWidth != 0) {
this.surfaceHolder.setFixedSize(this.videoWidth, this.videoHeight);
this.mediaPlayer.start();
}
}

@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub

}

@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
// TODO Auto-generated method stub

}

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

}

之前用的new MediaPlayer();出现not persent的问题，在网上查了下，说是android4.0之后必须用creat()方法，但是我更换了creat()方法之后，仍是报这个错误，求大神帮帮我。

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