Android提高第二十一篇之MediaPlayer播放网络视频
? ? ? 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：
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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：
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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. */ @Override public 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 { @Override public 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; @Override public 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(); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public 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); } } }?
本文来自http://blog.csdn.net/hellogv/article/details/6429455
