Android播放视频的方式
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();
}
}
