Android递归方式删除某文件夹下的所有文件

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1.由于需要删除文件，因此需要如下权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

2.核心代码

package com.example.deleteyoumi;import java.io.File;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;/* *@author: ZhengHaibo   *web:     http://blog.csdn.net/nuptboyzhb *mail:    zhb931706659@126.com *2013-4-28  Nanjing,njupt,China */public class DeleteYouMiMainActivity extends Activity implementsOnClickListener {private Button deleteButton;private final static String youmiPathString = "/mnt/sdcard/Android/data/.youmicache/";//文件夹的路径@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_delete_you_mi_main);deleteButton = (Button) findViewById(R.id.delete_youmi);deleteButton.setOnClickListener(this);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.delete_you_mi_main, menu);return true;}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.delete_youmi:File file = new File(youmiPathString);DeleteFile(file);mHandler.sendEmptyMessage(1);break;default:break;}}Handler mHandler = new Handler() {public void handleMessage(Message msg) {switch (msg.what) {case 0:Toast.makeText(getApplicationContext(), "文件或文件夹不存在", Toast.LENGTH_LONG).show();break;case 1:Toast.makeText(getApplicationContext(), "删除成功！", Toast.LENGTH_LONG).show();break;default:break;}};};/** * 递归删除文件和文件夹 *  * @param file *            要删除的根目录 */public void DeleteFile(File file) {if (file.exists() == false) {mHandler.sendEmptyMessage(0);return;} else {if (file.isFile()) {file.delete();return;}if (file.isDirectory()) {File[] childFile = file.listFiles();if (childFile == null || childFile.length == 0) {file.delete();return;}for (File f : childFile) {DeleteFile(f);}file.delete();}}}}

3.拓展
本博客是以删除为例。当然，对于遍历某文件夹下的所有文件均可用这个方法。如搜索.mp3文件等。