VideoSurfaceActivity.java

package com.parttime.IM;

import android.app.Activity;
import android.graphics.Point;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnSeekCompleteListener;
import android.media.MediaPlayer.OnVideoSizeChangedListener;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.LinearLayout;

import com.qingmu.jianzhidaren.R;

import java.io.IOException;

/**
 * 该实例中使用MediaPlayer完成播放，同时界面使用SurfaceView来实现  
 *   
 * 这里我们实现MediaPlayer中很多状态变化时的监听器  
 *   
 * 使用Mediaplayer时，也可以使用MediaController类，但是需要实现MediaController.mediaController接口  
 * 实现一些控制方法。  
 *   
 * 然后，设置controller.setMediaPlayer(),setAnchorView(),setEnabled(),show()就可以了，这里不再实现  
 * @author Administrator  
 *
 */    
public class VideoSurfaceActivity extends Activity implements MediaPlayer.OnCompletionListener,MediaPlayer.OnErrorListener,MediaPlayer.OnInfoListener,
        MediaPlayer.OnPreparedListener, OnSeekCompleteListener,OnVideoSizeChangedListener,SurfaceHolder.Callback{
    private Display currDisplay;
    private SurfaceView surfaceView;
    private SurfaceHolder holder;    
    private MediaPlayer player;
    private int vWidth,vHeight;    
    //private boolean readyToPlay = false;    
            
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);    
        this.setContentView(R.layout.video_surface);
                    
        surfaceView = (SurfaceView)this.findViewById(R.id.video_surface);    
        //给SurfaceView添加CallBack监听    
        holder = surfaceView.getHolder();    
        holder.addCallback(this);    
        //为了可以播放视频或者使用Camera预览，我们需要指定其Buffer类型    
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    
            
        //下面开始实例化MediaPlayer对象    
        player = new MediaPlayer();    
        player.setOnCompletionListener(this);    
        player.setOnErrorListener(this);    
        player.setOnInfoListener(this);    
        player.setOnPreparedListener(this);    
        player.setOnSeekCompleteListener(this);    
        player.setOnVideoSizeChangedListener(this);
        //然后指定需要播放文件的路径，初始化MediaPlayer    
        String dataPath = Environment.getExternalStorageDirectory().getPath()+"/sangfor/vedio.mp4";
        try {    
            player.setDataSource(dataPath);
        } catch (IllegalArgumentException | IllegalStateException | IOException e) {
            e.printStackTrace();
        }    
        //然后，我们取得当前Display对象    
        currDisplay = this.getWindowManager().getDefaultDisplay();

    }    
        
    @Override    
    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {    
        // 当Surface尺寸等参数改变时触发
    }    
    @Override    
    public void surfaceCreated(SurfaceHolder holder) {    
        // 当SurfaceView中的Surface被创建的时候被调用    
        //在这里我们指定MediaPlayer在当前的Surface中进行播放    
        player.setDisplay(holder);    
        //在指定了MediaPlayer播放的容器后，我们就可以使用prepare或者prepareAsync来准备播放了    
        player.prepareAsync();    
            
    }    
    @Override    
    public void surfaceDestroyed(SurfaceHolder holder) {    

    }    
    @Override    
    public void onVideoSizeChanged(MediaPlayer arg0, int arg1, int arg2) {    
        // 当video大小改变时触发    
        //这个方法在设置player的source后至少触发一次
    }    
    @Override    
    public void onSeekComplete(MediaPlayer arg0) {    
        // seek操作完成时触发
            
    }    
    @Override    
    public void onPrepared(MediaPlayer player) {    
        // 当prepare完成后，该方法触发，在这里我们播放视频    
            
        //首先取得video的宽和高    
        vWidth = player.getVideoWidth();    
        vHeight = player.getVideoHeight();

        int x = 0 ;
        int y = 0 ;
        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.GINGERBREAD_MR1) {
            Point point = new Point();
            currDisplay.getSize(point);
            x = point.x;
            y = point.y;
        }else{
            x = currDisplay.getWidth();
            y = currDisplay.getHeight();
        }


        if(vWidth > x || vHeight > y){
            //如果video的宽或者高超出了当前屏幕的大小，则要进行缩放    
            float wRatio = (float)vWidth/(float) x;
            float hRatio = (float)vHeight/(float) y;
                
            //选择小的一个进行缩放
            float ratio = Math.min(wRatio, hRatio);
                
            vWidth = (int)Math.ceil((float)vWidth/ratio);    
            vHeight = (int)Math.ceil((float)vHeight/ratio);    
                
            //设置surfaceView的布局参数    
            surfaceView.setLayoutParams(new LinearLayout.LayoutParams(vWidth, vHeight));
                
            //然后开始播放视频    
                
            player.start();    
        }else{
            //设置surfaceView的布局参数
            surfaceView.setLayoutParams(new LinearLayout.LayoutParams(x, y));

            //然后开始播放视频

            player.start();
        }
    }    
    @Override    
    public boolean onInfo(MediaPlayer player, int whatInfo, int extra) {    
        // 当一些特定信息出现或者警告时触发    
        switch(whatInfo){    
        case MediaPlayer.MEDIA_INFO_BAD_INTERLEAVING:    
            break;    
        case MediaPlayer.MEDIA_INFO_METADATA_UPDATE:      
            break;    
        case MediaPlayer.MEDIA_INFO_VIDEO_TRACK_LAGGING:    
            break;    
        case MediaPlayer.MEDIA_INFO_NOT_SEEKABLE:     
            break;    
        }    
        return false;    
    }    
    @Override    
    public boolean onError(MediaPlayer player, int whatError, int extra) {
        switch (whatError) {    
        case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
            break;    
        case MediaPlayer.MEDIA_ERROR_UNKNOWN:
            break;    
        default:    
            break;    
        }    
        return false;    
    }    
    @Override    
    public void onCompletion(MediaPlayer player) {    
        // 当MediaPlayer播放完成后触发
        this.finish();    
    }    
}