Android中三种视频的播放

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。

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();
        }
    }