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Android 视频开发

2013-12-12 16:40北大青鸟锦江天府学院
[导读] 在Android中,我们有三种方式来实现视频的播放: 1、使用其自带的播放器。指定Action为ACTION_VIEW,Data为Uri,Type为其MIME类型。 2、使用VideoView来播放。在布局文件中使用VideoView结合MediaCo

在Android中,我们有三种方式来实现视频的播放:

1、使用其自带的播放器。指定Action为ACTION_VIEW,Data为Uri,Type为其MIME类型。

2、使用VideoView来播放。在布局文件中使用VideoView结合MediaController来实现对其控制。

3、使用MediaPlayer类和SurfaceView来实现,这种方式很灵活。

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1、调用其自带的播放器:
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");
//调用系统自带的播放器
    Intent intent = new Intent(Intent.ACTION_VIEW);
    Log.v("URI:::::::::", uri.toString());
    intent.setDataAndType(uri, "video/mp4");
    startActivity(intent); 
 
2、使用VideoView来实现:
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");
VideoView videoView = (VideoView)this.findViewById(R.id.video_view);
videoView.setMediaController(new MediaController(this));
videoView.setVideoURI(uri);
videoView.start();
videoView.requestFocus();
3.使用MediaPlayer
package demo.camera;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnInfoListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.media.MediaPlayer.OnSeekCompleteListener;
import android.media.MediaPlayer.OnVideoSizeChangedListener;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.LinearLayout;
/**
 * 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 VideoSurfaceDemo extends Activity implements OnCompletionListener,OnErrorListener,OnInfoListener,
    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);
        Log.v("Begin:::", "surfaceDestroyed called");
        //然后指定需要播放文件的路径,初始化MediaPlayer
        String dataPath = Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v";
        try {
            player.setDataSource(dataPath);
            Log.v("Next:::", "surfaceDestroyed called");
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (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
        Log.v("Surface Change:::", "surfaceChanged called");
    }
    @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) { 
 
        Log.v("Surface Destory:::", "surfaceDestroyed called");
    }
    @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
        Log.v("Video Size Change", "onVideoSizeChanged called"); 
 
    }
    @Override
    public void onSeekComplete(MediaPlayer arg0) {
        // seek操作完成时触发
        Log.v("Seek Completion", "onSeekComplete called"); 
 
    }
    @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(); 
 
        if(vWidth > currDisplay.getWidth() || vHeight > currDisplay.getHeight()){
            //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)currDisplay.getWidth();
            float hRatio = (float)vHeight/(float)currDisplay.getHeight(); 
 
            //选择大的一个进行缩放
            float ratio = Math.max(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();
        }
    }
    @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) {
        Log.v("Play Error:::", "onError called");
        switch (whatError) {
        case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
            Log.v("Play Error:::", "MEDIA_ERROR_SERVER_DIED");
            break;
        case MediaPlayer.MEDIA_ERROR_UNKNOWN:
            Log.v("Play Error:::", "MEDIA_ERROR_UNKNOWN");
            break;
        default:
            break;
        }
        return false;
    }
    @Override
    public void onCompletion(MediaPlayer player) {
        // 当MediaPlayer播放完成后触发
        Log.v("Play Over:::", "onComletion called");
        this.finish();
    }
}
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