.3gp 文件播放初窥

近日在同事的帮助下,写了一个最简单的播放器apk,当然,是播放视频的,唔,没想到代码量真是少...

package VideoPlayer.norz; import android.app.Activity; import android.graphics.PixelFormat; import android.media.AudioManager; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.MediaController; import android.widget.VideoView; public class main extends Activity { private static final int SHUTDOWN = 0; private static final int OPEN3GP = 1; private static final int OPENMP4 = 2; private static final int OPENAVI = 3; private VideoView video; private MediaController mc; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFormat(PixelFormat.TRANSPARENT); setContentView(R.layout.main); initComponents(); } private void initComponents() { video = (VideoView) findViewById(R.id.VideoView); mc = new MediaController(this); } public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(0, OPENMP4, 0, R.string.open_mp4); menu.add(0, OPENAVI, 0, R.string.open_avi); menu.add(0, OPEN3GP, 0, R.string.open_3gp); menu.add(0, SHUTDOWN, 0, R.string.shut_down); return true; } public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case OPEN3GP: video.setVideoPath("data/test.3gp"); mc.setMediaPlayer(video); video.setMediaController(mc); video.start(); break; case OPENMP4: video.setVideoPath("data/test.mp4"); mc.setMediaPlayer(video); video.setMediaController(mc); video.start(); break; case OPENAVI: video.setVideoPath("data/test.avi"); mc.setMediaPlayer(video); video.setMediaController(mc); video.start(); break; case SHUTDOWN: video.stopPlayback(); this.finish(); break; default: return super.onContextItemSelected(item); } video.requestFocus(); return true; } }  

 

/************** main.xml ******************************/ <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <VideoView android:layout_height="fill_parent" android:layout_width="fill_parent" android:id="@+id/VideoView"></VideoView> </LinearLayout> /*************** strings.xml ***************************/ <?xml version="1.0" encoding="utf-8"?> <resources> <string name="open_3gp">打开3gp</string> <string name="app_name">VideoPlayer</string> <string name="shut_down">关闭...</string> <string name="open_mp4">打开MP4</string> <string name="open_avi">打开AVI</string> </resources>  

 

只是java,确实还是不太熟悉...

 

好了,废话说了这么多,还是来看 3gp的播放流程吧.

MediaPlayerService或者说pvmf以上的流层就不多说了,这些流程网上和书上都有很多描述.(比如说<<Android系统原理及开发要点详解>>).

参照:http://blog.youkuaiyun.com/wstarx/archive/2008/12/17/3541458.aspx

如果按照上文到fileformats中去找,会发现没有3gp文件格式?!