android控件之VideoView建立自己的播放器
简介
用来播放视频文件。该VideoView类可以加载各种来源的图像(如资源或内容提供商),需要计算它从视频测量,以便它可以在任何布局管理器使用,并提供诸如缩放和着色的各种显示选项。在其他的平台上面可能VideoPlayer开发是一个比较有挑战性的工作,但是在Android上面VideoPlayer的开发,基本上可以做到傻瓜式啦。本文简单对VideoPlayer的开发进行简单的介绍。
实例
1.布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<VideoView android:id="@+id/videoview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
/>
</LinearLayout>
2.Java代码
package com.wjq;
import android.app.Activity;
import android.content.pm.ActivityInfo;
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;
public class VideoViewDemo extends Activity implements MediaPlayer.OnErrorListener,MediaPlayer.OnCompletionListener{
public static final String TAG = "VideoPlayer";
private VideoView mVideoView;
private Uri mUri;
private int mPositionWhenPaused = -1;
private MediaController mMediaController;
/* (non-Javadoc)
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.videoview);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
mVideoView = (VideoView)findViewById(R.id.videoview);
//文件路径
mUri = Uri.parse(Environment.getExternalStorageDirectory() + "/ziranyouli.3gp");
//Create media controller
mMediaController = new MediaController(this);
//设置MediaController
mVideoView.setMediaController(mMediaController);
}
//监听MediaPlayer上报的错误信息
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
return false;
}
//Video播完的时候得到通知
@Override
public void onCompletion(MediaPlayer mp) {
this.finish();
}
//开始
public void onStart() {
// Play Video
mVideoView.setVideoURI(mUri);
mVideoView.start();
super.onStart();
}
//暂停
public void onPause() {
// 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 void onResume() {
// Resume video player
if(mPositionWhenPaused >= 0) {
mVideoView.seekTo(mPositionWhenPaused);
mPositionWhenPaused = -1;
}
super.onResume();
}
}