Android2.0源代码

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(); } }