Android使用FileObserver对sdcard文件或文件夹监控

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;
 
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
 
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);
}