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<String> items = null;//存放名称

private List<String> 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<String>();

paths = new ArrayList<String>();

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<String> adapter = new ArrayAdapter<String>(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"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView android:layout_width="fill_parent"

android:id="@+id/TextView"

android:background="#ffff00"

android:layout_height="wrap_content" android:text="@string/hello" />

<ListView android:id="@android:id/list"

android:layout_width="fill_parent"

android:layout_height="wrap_content">

</ListView>

</LinearLayout>