?

?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)
? */
[email protected]
?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

[email protected]
?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

[email protected]
?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();
???? }

?

}

?