<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical"

     tools:context=".MainActivity" >

     <EditText

         android:id="@+id/et_path"

         android:hint="请输入视频文件"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"

         android:text="/sdcard/mm.mp4"

         />

     <SeekBar

         android:id="@+id/sb"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content" />

     <LinearLayout

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"

         android:orientation="horizontal"

         >

         <Button

              android:id="@+id/bt_play"

              android:layout_weight="1"

              android:layout_width="0dip"

              android:layout_height="wrap_content"

              android:text="播放"

             />

          <Button

               android:id="@+id/bt_pause"

              android:layout_weight="1"

              android:layout_width="0dip"

              android:layout_height="wrap_content"

              android:text="暂停"

             />

           <Button

               android:id="@+id/bt_replay"

              android:layout_weight="1"

              android:layout_width="0dip"

              android:layout_height="wrap_content"

              android:text="重播"

             />

            <Button

               android:id="@+id/bt_stop"

              android:layout_weight="1"

              android:layout_width="0dip"

              android:layout_height="wrap_content"

              android:text="停止"

             />

     </LinearLayout>

     <SurfaceView

         android:id="@+id/sv"

         android:layout_width="fill_parent"

         android:layout_height="wrap_content"

         />

 </LinearLayout>

 package com.example.videoplay;

 import java.io.File;

 import android.media.AudioManager;

 import android.media.MediaPlayer;

 import android.media.MediaPlayer.OnCompletionListener;

 import android.os.Bundle;

 import android.app.Activity;

 import android.view.Menu;

 import android.view.SurfaceHolder;

 import android.view.SurfaceHolder.Callback;

 import android.view.SurfaceView;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.EditText;

 import android.widget.SeekBar;

 import android.widget.SeekBar.OnSeekBarChangeListener;

 import android.widget.Toast;

 public class MainActivity extends Activity implements OnClickListener{

     private EditText et_path;

     private Button bt_play,bt_pause,bt_replay,bt_stop;

     private MediaPlayer mediaPlayer;

     private SurfaceView sv;

     private int currentPosition;

     private SeekBar sb;

     private boolean isplaying;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         et_path = (EditText) findViewById(R.id.et_path);

         bt_play = (Button) findViewById(R.id.bt_play);

         bt_pause = (Button) findViewById(R.id.bt_pause);

         bt_replay = (Button) findViewById(R.id.bt_replay);

         bt_stop = (Button) findViewById(R.id.bt_stop);

         sb = (SeekBar) findViewById(R.id.sb);

         //监听进度条拖动改变状态

         sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

             //当拖动停止时的调用的方法

             @Override

             public void onStopTrackingTouch(SeekBar seekBar) {

                 int process = sb.getProgress();

                 if(mediaPlayer != null && mediaPlayer.isPlaying()){

                     mediaPlayer.seekTo(process);

                 }

             }

             @Override

             public void onStartTrackingTouch(SeekBar seekBar) {

                 // TODO Auto-generated method stub

             }

             @Override

             public void onProgressChanged(SeekBar seekBar, int progress,

                     boolean fromUser) {

                 // TODO Auto-generated method stub

             }

         });

         sv = (SurfaceView) findViewById(R.id.sv);

         //为什么要增加这个回调?主要是监控holder的变化的;因为如果你按一下小房子，声音仍在，而holder容易被销毁，再次打开时，看不到画面

         sv.getHolder().addCallback(new Callback(){

             @Override

             public void surfaceChanged(SurfaceHolder holder, int format,

                     int width, int height) {

                 // TODO Auto-generated method stub

                 System.out.println("holder被改变了!");

             }

             @Override

             public void surfaceCreated(SurfaceHolder holder) {

                 // TODO Auto-generated method stub

                 System.out.println("holder被创建了!");

                 if(currentPosition > 0){

                     play(currentPosition);

                 }

             }

             @Override

             public void surfaceDestroyed(SurfaceHolder holder) {

                 // TODO Auto-generated method stub

                 System.out.println("holder被销毁了!");

                 if(mediaPlayer != null && mediaPlayer.isPlaying()){

                     currentPosition = mediaPlayer.getCurrentPosition();//获取当前所播放的位置

                     stop();//holder被销毁时,就stop媒体

                 }

             }

         });

         bt_play.setOnClickListener(this);

         bt_pause.setOnClickListener(this);

         bt_replay.setOnClickListener(this);

         bt_stop.setOnClickListener(this);

     }

     @Override

     public void onClick(View v) {

         switch(v.getId()){

         case R.id.bt_play:

             play(0);

             break;

         case R.id.bt_pause:

             pause();

             break;

         case R.id.bt_replay:

             replay();

             break;

         case R.id.bt_stop:

             stop();

             break;

         }

     }

     private void pause() {

         if("继续".equals(bt_pause.getText().toString().trim())){

             mediaPlayer.start();

             bt_pause.setText("暂停");

             return;

         }

         if(mediaPlayer != null && mediaPlayer.isPlaying()){

             mediaPlayer.pause();

             bt_pause.setText("继续");

             return;

         }

     }

     private void replay() {

         if(mediaPlayer != null && mediaPlayer.isPlaying()){

             mediaPlayer.seekTo(0);

             return;

         }

         play(0);

     }

     private void stop() {

         // TODO Auto-generated method stub

         if(mediaPlayer != null && mediaPlayer.isPlaying()){

             mediaPlayer.stop();

             mediaPlayer.release();

             mediaPlayer = null;

             bt_play.setEnabled(true);

             isplaying = false;

         }

     }

     private void play(int currentPosition2){

         String path = et_path.getText().toString().trim();

         //File file = new File(path);

         //if(file.exists() && file.length() > 0){

             try {

                 mediaPlayer = new MediaPlayer();

                 mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

                 mediaPlayer.setDisplay(sv.getHolder());//设置video以SurfaceHolder播放

                 mediaPlayer.setDataSource(path);

                 //mediaPlayer.seekTo(currentPosition2);//不能把这定位放在此，否则播放不了

                 mediaPlayer.prepare();

                 mediaPlayer.seekTo(currentPosition2);

                 mediaPlayer.start();

                 //获取视频总长度

                 int max = mediaPlayer.getDuration();

                 sb.setMax(max);

                 new Thread(){

                     public void run(){

                         isplaying = true;

                         while(isplaying){

                             int position = mediaPlayer.getCurrentPosition();

                             sb.setProgress(position);

                             try {

                                 Thread.sleep(500);

                             } catch (InterruptedException e) {

                                 // TODO Auto-generated catch block

                                 e.printStackTrace();

                             }

                         }

                     }

                 }.start();

                 mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

                     @Override

                     public void onCompletion(MediaPlayer mp) {

                         // TODO Auto-generated method stub

                         bt_play.setEnabled(true);

                         isplaying = false;

                     }

                 });

                 bt_play.setEnabled(false);

             } catch (Exception e) {

                 // TODO Auto-generated catch block

                 Toast.makeText(this, "播放失败!", 0).show();

                 e.printStackTrace();

             }

         //}else{

             //Toast.makeText(this, "音频文件不存在!", 0).show();

         //}

     }

 }