android 播发网络视频和音频

android 播放网络视频和音频
       本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！
       上次讲解了MediaPlayer播放网络音频，介绍了MediaPlayer关于网络音频的缓冲和进度条控制的方法，这次再讲解MediaPlayer播放网络视频。播放网络视频比播放网络音频多需要一个SurfaceView而已，已经熟悉MediaPlayer播放网络音频之后，相信大家对播放网络视频也能很快地掌握。先来看看本文程序运行截图：


本文程序的视频来自http://daily3gp.com，大家可以替换程序中的视频链接，试试其他影片。
main.xml的源码如下：

Player.java是本文的核心，Player.java实现了“进度条更新”、“数据缓冲”、“SurfaceHolder生命周期”等功能，其中“SurfaceHolder生命周期”是视频与音频播放的最大区别，通过surfaceCreated()、surfaceDestroyed()、surfaceChanged()可以创建/释放某些资源。下面这个地方需要注意一下：
package com.videoplayer;import android.app.Activity;import android.content.pm.ActivityInfo;import android.net.Uri;import android.os.Bundle;import android.util.Log;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.SeekBar;public class test_videoplayer extends Activity {private SurfaceView surfaceView;private Button btnPause, btnPlayUrl, btnStop;private SeekBar skbProgress;private Player player;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView1);btnPlayUrl = (Button) this.findViewById(R.id.btnPlayUrl);btnPlayUrl.setOnClickListener(new ClickEvent());btnPause = (Button) this.findViewById(R.id.btnPause);btnPause.setOnClickListener(new ClickEvent());btnStop = (Button) this.findViewById(R.id.btnStop);btnStop.setOnClickListener(new ClickEvent());skbProgress = (SeekBar) this.findViewById(R.id.skbProgress);skbProgress.setOnSeekBarChangeListener(new SeekBarChangeEvent());player = new Player(surfaceView, skbProgress);}class ClickEvent implements OnClickListener {@Overridepublic void onClick(View arg0) {if (arg0 == btnPause) {player.pause();} else if (arg0 == btnPlayUrl) {String url="http://daily3gp.com/vids/family_guy_penis_car.3gp";player.playUrl(url);} else if (arg0 == btnStop) {player.stop();}}}class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener {int progress;@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// 原本是(progress/seekBar.getMax())*player.mediaPlayer.getDuration()this.progress = progress * player.mediaPlayer.getDuration()/ seekBar.getMax();}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// seekTo()的参数是相对与影片时间的数字，而不是与seekBar.getMax()相对的数字player.mediaPlayer.seekTo(progress);}}}