视频播放-SurfaceView

1、视图

 <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>

2、android代码

 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();
         //}
     }

 }

注意:

1)如果要播放互联网文件，则要加入网络权限: <uses-permission android:name="android.permission.INTERNET"/>

2)要注意和音频文件的播放代码进行比较，音频代码为:http://www.cnblogs.com/zhongyinghe/p/5354040.html