Activity程序

package com.example.fileasynctaskproject;

import java.io.File;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.os.AsyncTask;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

private ListView mylist=null;

private List<Map<String,Object>> filelist=new ArrayList<Map<String,Object>>();

private SimpleAdapter simple=null;

private ListFileThread tf=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

super.setContentView(R.layout.activity_main);

this.mylist=(ListView)super.findViewById(R.id.mylist);

File file=new File(java.io.File.separator);//从根目录下开始列出

this.tf=new ListFileThread();

tf.execute(file);

this.mylist.setOnItemClickListener(new OnItemClickListenerlmpl());

}

private class OnItemClickListenerlmpl implements OnItemClickListener{

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

File currFile=(File)MainActivity.this.filelist.get(arg2).get("name");

if(currFile.isDirectory()){

MainActivity.this.filelist=new ArrayList<Map<String,Object>>();

ListFileThread tft=new ListFileThread();

tft.execute(currFile);

}

}

}

private class ListFileThread extends AsyncTask<File, File, String>{

@Override

protected void onProgressUpdate(File... values) {

Map<String,Object> map=new HashMap<String, Object>();

if(values[0].isDirectory()){//如果是目录

map.put("img", R.drawable.folder_close);//设置文件夹图标

}else{

map.put("img", R.drawable.file);//设置文件图标

}

map.put("name", values[0]);

MainActivity.this.filelist.add(map);

MainActivity.this.simple=new SimpleAdapter(

MainActivity.this,

MainActivity.this.filelist, 

R.layout.file_out, 

new String[]{"img","name"}, 

new int[]{R.id.img,R.id.name});

MainActivity.this.mylist.setAdapter(MainActivity.this.simple);

}

@Override

protected String doInBackground(File... params) {

if(!params[0].getPath().equals(java.io.File.separator)){//不是根目录

Map<String,Object> map=new HashMap<String, Object>();

map.put("img", R.drawable.folder_open);

map.put("name", params[0].getParentFile());

MainActivity.this.filelist.add(map);

}

if(params[0].isDirectory()){//路径是目录

File tempFile[]=params[0].listFiles();

if(tempFile!=null){

for (int i = 0; i < tempFile.length; i++) {

this.publishProgress(tempFile[i]);

}

}

}

return "执行完毕";

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

界面配置文件Activity_mail.xml

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

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent" >

    <ListView 

        android:id="@+id/mylist"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"/>

</LinearLayout>

表格布局file_out.xml

<?xml version="1.0" encoding="utf-8"?>

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

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <TableRow>

        <ImageView 

            android:id="@+id/img"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"/>

        <TextView

            android:id="@+id/name"

            android:layout_width="180px"

            android:layout_height="wrap_content"/>

    </TableRow>

</TableLayout>

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