Android FileObserver检测文件变化demo

package com.ichliebephone; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.os.FileObserver; import android.view.View; import android.widget.Button; import android.view.View.OnClickListener; public class FileObserverDemo extends Activity implements OnClickListener{ String TAG = "fb_test"; private Button btn_start; FileObserver fb; String path = "/mnt/sdcard/test.txt"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn_start = (Button) findViewById(R.id.btn_start); btn_start.setOnClickListener(this); Log.e(TAG,"Enter OnCreate()...."); file_observer(); } public void file_observer(){ fb = new FileObserver(path){ @Override public void onEvent(int event, String path) { switch (event) { case FileObserver.MODIFY://修改删除 Log.d(TAG, "File is Modifing..."); break; } } }; } @Override public void onClick(View v) { if(v == btn_start){ Log.e(TAG,"startWatching file ...."); //开启监听 fb.startWatching(); //结束监听 //fb.stopWatching(); } } }