android SD卡文件变化监控
16lz
2021-01-23
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 ; } } } } |
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