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    Android中SurfaceView视频播放实现代码

    出处：互联网

    Surfaceview的特性是：可以在主线程之外的线程中向屏幕绘图上。这样可以避免画图任务繁重的时候造成主线程阻塞，从而提高了程序的反应速度。在游戏开发中多用到SurfaceView，游戏中的背景、人物、动画等等尽量在画布canvas中画出。

    1.案例一

    布局文件：

    < xml version="1.0" encoding="utf-8" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" android:layout_width="fill_parent"   
 android:layout_height="fill_parent" android:weightSum="1">    
<SurfaceView 
android:layout_height="220dip"
android:layout_gravity="center" 
android:id="@+id/surface" 
android:layout_weight="0.25" 
android:layout_width="320dip">
</SurfaceView>    
<LinearLayout
android:id="@+id/linearLayout1" 
android:layout_height="wrap_content"
android:layout_width="fill_parent">        
<Button 
android:text="播放" 
android:id="@+id/button1" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content">
</Button>       
<Button 
android:text="暂停" 
android:id="@+id/button2" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content">
</Button>       
<Button 
android:text="停止" 
android:id="@+id/button3" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content">
</Button>   
</LinearLayout>
</LinearLayout>

    主程序：

     

    public class SurfaceActivity extends Activity implements SurfaceHolder.Callback {   
      /** Called when the activity is first created. */    
     MediaPlayer player;    
     SurfaceView surface;     
    SurfaceHolder surfaceHolder;     
    Button play,pause,stop;     
    @Override   
      public void onCreate(Bundle savedInstanceState) {    
        super.onCreate(savedInstanceState);        
      setContentView(R.layout.main);         
     play=(Button)findViewById(R.id.button1);        
      pause=(Button)findViewById(R.id.button2);        
      stop=(Button)findViewById(R.id.button3);         
      surface=(SurfaceView)findViewById(R.id.surface);       
        surfaceHolder=surface.getHolder();//SurfaceHolder是SurfaceView的控制接口        
      surfaceHolder.addCallback(this); //因为这个类实现了SurfaceHolder.Callback接口，所以回调参数直接this         
     surfaceHolder.setFixedSize(320, 220);//显示的分辨率,不设置为视频默认         
     surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//Surface类型          
     play.setOnClickListener(new OnClickListener(){           
        @Override           
       public void onClick(View v) {               
       player.start();           
       }});        
     pause.setOnClickListener(new OnClickListener(){       
           @Override            
      public void onClick(View v) {         
             player.pause();           
       }});         
      stop.setOnClickListener(new OnClickListener(){       
            @Override          
        public void onClick(View v) {              
       player.stop();          
        }});    
     }     
     @Override    
     public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {    
     }     
     @Override     
    public void surfaceCreated(SurfaceHolder arg0) { 
    //必须在surface创建后才能初始化MediaPlayer,否则不会显示图像      
       player=new MediaPlayer();        
      player.setAudioStreamType(AudioManager.STREAM_MUSIC);    
       player.setDisplay(surfaceHolder);       
      //设置显示视频显示在SurfaceView上           
      try {               
      player.setDataSource("/sdcard/3.mp4");         
            player.prepare();             
    } catch (Exception e) {             
        e.printStackTrace();          
       }    
     }      
    @Override     
    public void surfaceDestroyed(SurfaceHolder arg0) {      
       // TODO Auto-generated method stub   
       }      
    @Override    protected void onDestroy() {       
      // TODO Auto-generated method stub       
      super.onDestroy();        
     if(player.isPlaying()){      
       player.stop();        }      
       player.release();       
      //Activity销毁时停止播放，释放资源。不做这个操作，即使退出还是能听到视频播放的声音 
        } 
    }

    2.案例二

    布局文件main.xml

     

    < xml version="1.0" encoding="utf-8" > 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     
android:orientation="vertical"     
android:layout_width="fill_parent"     
android:layout_height="fill_parent"     
android:background="#ffffff"     
> 
<TextView   
   android:layout_width="wrap_content"     
android:layout_height="wrap_content"    
android:text="@string/filename"     
/> 
<EditText  
android:layout_width="fill_parent"     
android:layout_height="wrap_content"    
android:text="oppo.mp4"    
android:id="@+id/filename"    
/> 
<LinearLayout     
android:orientation="horizontal"    
android:layout_width="fill_parent"  
android:layout_height="wrap_content"    
>     
<ImageButton  
android:layout_width="wrap_content"  
android:layout_height="fill_parent"      
android:src="@drawable/play"     
   android:id="@+id/play"    
/>    
<ImageButton  
android:layout_width="wrap_content"   
android:layout_height="fill_parent"     
   android:src="@drawable/pause"         
android:id="@+id/pause"     
/>    
<ImageButton   
android:layout_width="wrap_content"   
android:layout_height="fill_parent"     
   android:src="@drawable/stop"      
android:id="@+id/stop"    
/>   
<ImageButton  
android:layout_width="wrap_content"   
android:layout_height="fill_parent"    
android:src="@drawable/reset"       
android:id="@+id/reset"   
/> 
</LinearLayout> 
<SurfaceView  
android:layout_width="fill_parent"      
android:layout_height="fill_parent"      
android:id="@+id/surfaceview"   
/> 
</LinearLayout>

    主程序VodeoPlayActivity.java

     

    public class VodeoPlayActivity extends Activity {   
  /** Called when the activity is first created. */    
  private EditText filenamEditText;  
  private MediaPlayer mediaPlayer;    
  private String filename;    
  private SurfaceView surfaceView;    
  private final static String TAG="VodeoPlayActivity";  
  private int prosition=0;        
  @Override    
  public void onCreate(Bundle savedInstanceState) {    
  super.onCreate(savedInstanceState);     
  setContentView(R.layout.main);        
  filenamEditText=(EditText) this.findViewById(R.id.filename);    
  surfaceView=(SurfaceView)this.findViewById(R.id.surfaceview);       
  surfaceView.getHolder().setFixedSize(176, 144);//设置分辨率       
  surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//设置surfaceview不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前     
  surfaceView.getHolder().addCallback(new SurceCallBack());//对surface对象的状态进行监听      
  mediaPlayer=new MediaPlayer();           
  ButtonOnClikListiner buttonOnClikListinero=new ButtonOnClikListiner();      
  ImageButton start=(ImageButton) this.findViewById(R.id.play);         
  ImageButton pause=(ImageButton) this.findViewById(R.id.pause);        
  ImageButton stop=(ImageButton) this.findViewById(R.id.stop);        
  ImageButton replay=(ImageButton) this.findViewById(R.id.reset);      
  start.setOnClickListener(buttonOnClikListinero);     
  pause.setOnClickListener(buttonOnClikListinero);     
  stop.setOnClickListener(buttonOnClikListinero);      
  replay.setOnClickListener(buttonOnClikListinero);    
  }      
  private final class ButtonOnClikListiner implements View.OnClickListener{      
  @Override    
  public void onClick(View v) {    
  if(Environment.getExternalStorageState()==Environment.MEDIA_UNMOUNTED){       
  Toast.makeText(VodeoPlayActivity.this, "sd卡不存在", Toast.LENGTH_SHORT).show();             
  return;       
  }         
  filename=filenamEditText.getText().toString();         
  switch (v.getId()) {         
  case R.id.play:             
  play();                
  break;          
  case R.id.pause:          
  if(mediaPlayer.isPlaying()){       
  mediaPlayer.pause();            
  }else{                   
  mediaPlayer.start();         
  }                 
  break;          
  case R.id.reset:         
  if(mediaPlayer.isPlaying()){    
  mediaPlayer.seekTo(0);             
  }else{              
  play();              
  }               
  break;            
  case R.id.stop:          
  if(mediaPlayer.isPlaying()){    
  mediaPlayer.stop();             
  }               
  break;            
  }        
  }      
  }       
  private void play() {     
  try {                
  File file=new File(Environment.getExternalStorageDirectory(),filename);        
  mediaPlayer.reset();//重置为初始状态         
  mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//设置音乐流的类型            
  mediaPlayer.setDisplay(surfaceView.getHolder());//设置video影片以surfaceviewholder播放       
  mediaPlayer.setDataSource(file.getAbsolutePath());//设置路径             
  mediaPlayer.prepare();//缓冲                
  mediaPlayer.start();//播放            
  } catch (Exception e) {         
  Log.e(TAG, e.toString());                
  e.printStackTrace();            
  }     
  }      
  private final class SurceCallBack implements SurfaceHolder.Callback{    
  /**         * 画面修改         */        
  @Override        
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {  
  // TODO Auto-generated method stub                
  }       
  /**         * 画面创建         */     
  @Override        
  public void surfaceCreated(SurfaceHolder holder) {           
  if(prosition>0&&filename!=null){            
  play();               
  mediaPlayer.seekTo(prosition);            
  prosition=0;            }          
  }      
  /**         * 画面销毁         */        
  @Override        
  public void surfaceDestroyed(SurfaceHolder holder) {      
  if(mediaPlayer.isPlaying()){        
  prosition=mediaPlayer.getCurrentPosition();          
  mediaPlayer.stop();         
  }        
  }    
  } 
  }
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