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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <ListView

        android:id="@+id/mylist"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:divider="#b5b5b5"

        android:dividerHeight="1dp"

        android:listSelector="@drawable/list_selector" />

    <Button

        android:id="@+id/btn_clear"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="清除缓存, 重新加载" />

</LinearLayout>

CustomizedListView.java Request.java 访问网络

package com.example.androidhive;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import org.json.JSONArray;

import org.json.JSONException;

public class Request {

    public Request() {

    public JSONArray getJsonFromUrl(String urlStr) {

        try {

            URL url = new URL(urlStr);

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            conn.setRequestMethod("GET");

            // Sets the flag indicating whether this URLConnection allows input.

            // conn.setDoInput(true);

            conn.setConnectTimeout(3000);

            conn.setReadTimeout(3000);

            // Flag to define whether the protocol will automatically follow

            // redirects or not.

            conn.setInstanceFollowRedirects(true);

            int response_code = conn.getResponseCode();

            if (response_code == 200) {

                InputStream in = conn.getInputStream();

                InputStreamReader inputReader = new InputStreamReader(in);

                BufferedReader buffReader = new BufferedReader(inputReader);

                String line = "", JsonStr = "";

                while ((line = buffReader.readLine()) != null) {

                    JsonStr += line;

                JSONArray jsonArray = new JSONArray(JsonStr);

                return jsonArray;

            } else {

                conn.disconnect();

                return null;

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } catch (JSONException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        return null;

.csharpcode .lnum { color: rgba(96, 96, 96, 1) }StreamUtils.java 缓存时的I/O操作

package com.example.androidhive;

import java.io.InputStream;

import java.io.OutputStream;

public class StreamUtils {

    public static void CopyStream(InputStream is, OutputStream os)

        final int buffer_size=1024;

            byte[] bytes=new byte[buffer_size];

            for(;;)

              int count=is.read(bytes, 0, buffer_size);

              if(count==-1)

                  break;

              os.write(bytes, 0, count);

        catch(Exception ex){}

androidhive android-custom-listview-with-imgae-and-text

androidhive android android-custom-listview-with-image-and-text 译文

这三个链接的关系是，第二个链接的演示是根据第一个链接完成的，第三个链接翻译的第二个链接。但遗憾的是，英文原文是有bug的，程序运行不稳定。

Android ListView 和 ***Adapter 从本地/网络获取歌曲列表

Android LazyList 从网络获取图片并缓存