Android遞歸方式刪除某文件夾下的所有文件

1.由於需要刪除文件，因此需要如下權限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

2.核心代碼

[java]
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:    [email protected]
 *2013-4-28  Nanjing,njupt,China
 */ 
public class DeleteYouMiMainActivity extends Activity implements 
        OnClickListener { 
    private Button deleteButton; 
    private final static String youmiPathString = "/mnt/sdcard/Android/data/.youmicache/";//文件夾的路徑  
 
    @Override 
    protected 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); 
    } 
 
    @Override 
    public 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; 
    } 
 
    @Override 
    public void onClick(View v) { 
        // TODO Auto-generated method stub  
        switch (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(), "文件或文件夾不存在", Toast.LENGTH_LONG).show(); 
                break; 
            case 1: 
                Toast.makeText(getApplicationContext(), "刪除成功！", Toast.LENGTH_LONG).show(); 
                break; 
            default: 
                break; 
            } 
        }; 
    }; 
    /**
     * 遞歸刪除文件和文件夾
     * 
     * @param file
     *            要刪除的根目錄
     */ 
    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(); 
            } 
        } 
    } 
} 

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:    [email protected]
 *2013-4-28  Nanjing,njupt,China
 */
public class DeleteYouMiMainActivity extends Activity implements
  OnClickListener {
 private Button deleteButton;
 private final static String youmiPathString = "/mnt/sdcard/Android/data/.youmicache/";//文件夾的路徑

 @Override
 protected 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);
 }

 @Override
 public 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;
 }

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  switch (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(), "文件或文件夾不存在", Toast.LENGTH_LONG).show();
    break;
   case 1:
    Toast.makeText(getApplicationContext(), "刪除成功！", Toast.LENGTH_LONG).show();
    break;
   default:
    break;
   }
  };
 };
 /**
  * 遞歸刪除文件和文件夾
  *
  * @param file
  *            要刪除的根目錄
  */
 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
本博客是以刪除為例。當然，對於遍歷某文件夾下的所有文件均可用這個方法。如搜索.mp3文件等。