Android之SurfaceView实现视频播放

<?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>

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
    }
}

<?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>

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();
            }
        }
    }
}