在其他的平台上实现VideoPlayer可能是一个比较困难的事情,但在Android上基本上可以做到傻瓜式了。本文对VideoPlayer的开发进行简单的介绍。
在Android系统中,是通过MediaPalyer类播放媒体文件的(包括视频和音频)。虽然这个类已经比较简单了,但是还需要控制各种状态,对于视频还需要设置输出窗口,还是需要仔细研究的。为了避免这些麻烦事儿,Android框架提供了VideoView类来封装MediaPalyer,这个VideoView类非常好用。Android自带的程序Gallery也是用VideoView实现的。本文以实例介绍怎样用VideoView来实现VideoPlayer,本文也参考了Android自带程序Gallery的实现。
创建一个AndroidVideoPlayer的工程。
main.xml文件如下:
http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:orientation="vertical"
>
android:id="@+id/video_view"
android:layout_centerinparent="true"
android:layout_height="match_parent"
android:layout_width="match_parent"
/>
VideoPlayer.java文件如下:
package com.simon;
import android.app.Activity;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.MediaController;
import android.widget.VideoView;
import android.content.pm.ActivityInfo;
public class VideoPlayer extends Activity implementsMediaPlayer.OnErrorListener,
MediaPlayer.OnCompletionListener {
publicstatic final String TAG = "VideoPlayer";
privateVideoView mVideoView;
private UrimUri;
private intmPositionWhenPaused = -1;
privateMediaController mMediaController;
@Override
public voidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Set the screen to landscape.
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
mVideoView = (VideoView)findViewById(R.id.video_view);
//Video file
mUri = Uri.parse(Environment.getExternalStorageDirectory() +"/1.3gp");
//Create media controller
mMediaController = new MediaController(this);
mVideoView.setMediaController(mMediaController);
}
public voidonStart() {
// Play Video
mVideoView.setVideoURI(mUri);
mVideoView.start();
super.onStart();
}
public voidonPause() {
// Stop video when the activity is pause.
mPositionWhenPaused = mVideoView.getCurrentPosition();
mVideoView.stopPlayback();
Log.d(TAG, "OnStop: mPositionWhenPaused = " +mPositionWhenPaused);
Log.d(TAG, "OnStop: getDuration = " +mVideoView.getDuration());
super.onPause();
}
public voidonResume() {
// Resume video player
if(mPositionWhenPaused >= 0) {
mVideoView.seekTo(mPositionWhenPaused);
mPositionWhenPaused = -1;
}