android SD卡文件变化监控-优快云博客

package com.orgcent.filelistener ;

import android.app.Activity ;
import android.os.Bundle ;
import android.os.Environment ;
import android.os.FileObserver ;

public class AndroidFileListenerActivity extends Activity {
private FileObserver mFileObserver ;

if ( null == mFileObserver ) {
mFileObserver = new SDCardFileObserver ( Environment. getExternalStorageDirectory ( ). getPath ( ) ) ;
mFileObserver. startWatching ( ) ; //开始监听
}

public void onDestory ( ) {
if ( null != mFileObserver ) mFileObserver. stopWatching ( ) ; //停止监听
}

static class SDCardFileObserver extends FileObserver {
//mask:指定要监听的事件类型，默认为FileObserver.ALL_EVENTS
public SDCardFileObserver ( String path, int mask ) {
super (path, mask ) ;
}

public SDCardFileObserver ( String path ) {
super (path ) ;
}

@Override
public void onEvent ( int event, String path ) {
final int action = event & FileObserver. ALL_EVENTS ;
switch (action ) {
case FileObserver. ACCESS :
System. out. println ( "event: 文件或目录被访问, path: " + path ) ;
break ;

case FileObserver. DELETE :
System. out. println ( "event: 文件或目录被删除, path: " + path ) ;
break ;

case FileObserver. OPEN :
System. out. println ( "event: 文件或目录被打开, path: " + path ) ;
break ;

case FileObserver. MODIFY :
System. out. println ( "event: 文件或目录被修改, path: " + path ) ;
break ;
}
}

}
}