android获取指定路径下目录文件

package com.Aina.Android;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class Test_ListFile extends ListActivity {
     /** Called when the activity is first created. */
     private List items = null;//存放名称
     private List paths = null;//存放路径
     private String rootPath = "/";
     private TextView tv;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         tv = (TextView) this.findViewById(R.id.TextView);
         this.getFileDir(rootPath);//获取rootPath目录下的文件.
     }

     public void getFileDir(String filePath) {
         try{
             this.tv.setText("当前路径:"+filePath);// 设置当前所在路径
             items = new ArrayList();
             paths = new ArrayList();
             File f = new File(filePath);
             File[] files = f.listFiles();// 列出所有文件
             // 如果不是根目录,则列出返回根目录和上一目录选项
             if (!filePath.equals(rootPath)) {
                 items.add("返回根目录");
                 paths.add(rootPath);
                 items.add("返回上一层目录");
                 paths.add(f.getParent());
             }
             // 将所有文件存入list中
             if(files != null){
                 int count = files.length;// 文件个数
                 for (int i = 0; i < count; i++) {
                     File file = files[i];
                     items.add(file.getName());
                     paths.add(file.getPath());
                 }
             }

             ArrayAdapter adapter = new ArrayAdapter(this,
                     android.R.layout.simple_list_item_1, items);
             this.setListAdapter(adapter);
         }catch(Exception ex){
             ex.printStackTrace();
         }

     }

     @Override
     protected void onListItemClick(ListView l, View v, int position, long id) {
         super.onListItemClick(l, v, position, id);
         String path = paths.get(position);
         File file = new File(path);
         //如果是文件夹就继续分解
         if(file.isDirectory()){
             this.getFileDir(path);
         }else{
             new AlertDialog.Builder(this).setTitle("提示").setMessage(file.getName()+" 是一个文件！").setPositiveButton("OK", new DialogInterface.OnClickListener(){

                 public void onClick(DialogInterface dialog, int which) {

                 }

             }).show();
         }
     }

}

<?xml version="1.0" encoding="utf-8"?>
     android:orientation="vertical" android:layout_width="fill_parent"
     android:layout_height="fill_parent">
              android:id="@+id/TextView"
         android:background="#ffff00"
         android:layout_height="wrap_content" android:text="@string/hello" />
              android:layout_width="fill_parent"
         android:layout_height="wrap_content">

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