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(); } }