使用FileObserver 类监听android sd卡变动，,import andro

使用FileObserver 类监听android sd卡变动，,import andro

import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.net.Uri;import android.os.Environment;import android.os.FileObserver;import android.util.Log;/** * sd卡上的目录创建监听器 */public class SDCardListener extends FileObserver {    private Context context;    public SDCardListener(Context context, String path) {        // 这种构造方法是默认监听所有事件的,如果使用super(String,int)这种构造方法， 则int参数是要监听的事件类型.        super(path);        this.context = context;        init();    }    /**     * 注册监听器     */    public void init() {        IntentFilter intentfilter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_STARTED);        intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);        intentfilter.addDataScheme("file");        ScanSdReceiver scanSdReceiver = new ScanSdReceiver();        context.registerReceiver(scanSdReceiver, intentfilter);    }    @Override    public void onEvent(int event, String path) {        switch (event) {        case FileObserver.CREATE://监听创建            Log.d("Create", "path:" + path);            rescanSdcard();            break;        case FileObserver.DELETE://监听删除            Log.d("Delete", "path:" + path);            rescanSdcard();            break;        }    }    /**     * 刷新SD卡     */    public void rescanSdcard() {        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,                 Uri.parse("file://"+ Environment.getExternalStorageDirectory().getAbsolutePath())));    }}