Android File文件操作

<?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>

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();
		}
	}
	
}