Android的HTTP通信 XML解析和异步消息处理

项目上点右键 -> Build Path -> Add Libraries -> User Library -> User Libraries -> New -> 为类库起个名字 -> 选中这个类库 -> Add JARs 导入 Android 的 jar 包

项目上点右键 -> Build Path -> Add Libraries -> User Library -> 选择 Android 库

DownloadManagerAsync.java

代码

package webabcd.util;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.URL;

import java.net.URLConnection;

import org.apache.http.protocol.HTTP;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

// 以一个实例，即异步下载，来演示 Android 的异步消息处理(用 Handler 的方式)

public class DownloadManagerAsync {

public DownloadManagerAsync() {

}

// 实例化自定义的 Handler

EventHandler mHandler = new EventHandler(this);

// 按指定 url 地址下载文件到指定路径

public void download(final String url, final String savePath) {

new Thread(new Runnable() {

public void run() {

try {

sendMessage(FILE_DOWNLOAD_CONNECT);

URL sourceUrl = new URL(url);

URLConnection conn = sourceUrl.openConnection();

InputStream inputStream = conn.getInputStream();

int fileSize = conn.getContentLength();

File savefile = new File(savePath);

if (savefile.exists()) {

savefile.delete();

}

savefile.createNewFile();

FileOutputStream outputStream = new FileOutputStream(

savePath, true);

byte[] buffer = new byte[1024];

int readCount = 0;

int readNum = 0;

int prevPercent = 0;