Android软件自动更新实现代码

<update> <version>2</version> <name>baiduxinwen.apk</name> <url>http://gdown.baidu.com/data/wisegame/e5f5c3b8e59401c8/baiduxinwen.apk</url></update>

package com.xiaowu.news.update;import java.io.InputStream;import java.util.HashMap;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;public class ParseXmlService { public HashMap<String, String> parseXml (InputStream inStream) throws Exception{ HashMap<String, String> hashMap = new HashMap<String, String>(); //创建DocumentBuilderFactory，该对象将创建DocumentBuilder。 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); //创建DocumentBuilder，DocumentBuilder将实际进行解析以创建Document对象 DocumentBuilder builder = factory.newDocumentBuilder(); //解析该文件以创建Document对象 Document document = builder.parse(inStream); //获取XML文件根节点  Element root = document.getDocumentElement(); //获得所有子节点 NodeList childNodes = root.getChildNodes(); for(int i = 0; i < childNodes.getLength(); i++) {  Node childNode = (Node) childNodes.item(i);  if(childNode.getNodeType() == Node.ELEMENT_NODE) {  Element childElement = (Element) childNode;  //版本号   if("version".equals(childElement.getNodeName())) {   hashMap.put("version", childElement.getFirstChild().getNodeValue());  //软件名称   } else if("name".equals(childElement.getNodeName())) {   hashMap.put("name", childElement.getFirstChild().getNodeValue());  //下载地址  } else if("url".equals(childElement.getNodeName())) {   hashMap.put("url", childElement.getFirstChild().getNodeValue());  }  }   } return hashMap; }}

package com.xiaowu.news.update;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.HashMap;import javax.net.ssl.HttpsURLConnection;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.content.DialogInterface.OnClickListener;import android.content.pm.PackageManager.NameNotFoundException;import android.net.Uri;import android.os.Environment;import android.os.Handler;import android.view.LayoutInflater;import android.view.View;import android.widget.ProgressBar;import android.widget.Toast;import com.xiaowu.news.R;/** *  * @author wwj * @date 2012/11/17 * 实现软件更新的管理类 */public class UpdateManager {  //下载中... private static final int DOWNLOAD = 1; //下载完成 private static final int DOWNLOAD_FINISH = 2; //保存解析的XML信息 HashMap<String , String> mHashMap; //下载保存路径 private String mSavePath; //记录进度条数量 private int progress; //是否取消更新 private boolean cancelUpdate = false; //上下文对象 private Context mContext; //进度条 private ProgressBar mProgressBar; //更新进度条的对话框 private Dialog mDownloadDialog;   private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) {  switch(msg.what){  //下载中。。。  case DOWNLOAD:  //更新进度条  System.out.println(progress);  mProgressBar.setProgress(progress);  break;  //下载完成  case DOWNLOAD_FINISH:  // 安装文件  installApk();  break;  } }; }; public UpdateManager(Context context) { super(); this.mContext = context; }   /** * 检测软件更新 */ public void checkUpdate() { if (isUpdate()) {  //显示提示对话框  showNoticeDialog(); } else {  Toast.makeText(mContext, R.string.soft_update_no, Toast.LENGTH_SHORT).show(); }  }  private void showNoticeDialog() { // TODO Auto-generated method stub //构造对话框 AlertDialog.Builder builder = new Builder(mContext); builder.setTitle(R.string.soft_update_title); builder.setMessage(R.string.soft_update_info); //更新 builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener() {    @Override  public void onClick(DialogInterface dialog, int which) {  // TODO Auto-generated method stub  dialog.dismiss();  // 显示下载对话框  showDownloadDialog();  } }); // 稍后更新 builder.setNegativeButton(R.string.soft_update_later, new OnClickListener() {    @Override  public void onClick(DialogInterface dialog, int which) {  // TODO Auto-generated method stub  dialog.dismiss();  } }); Dialog noticeDialog = builder.create(); noticeDialog.show(); }  private void showDownloadDialog() { // 构造软件下载对话框 AlertDialog.Builder builder = new Builder(mContext); builder.setTitle(R.string.soft_updating); // 给下载对话框增加进度条 final LayoutInflater inflater = LayoutInflater.from(mContext); View view = inflater.inflate(R.layout.softupdate_progress, null); mProgressBar = (ProgressBar) view.findViewById(R.id.update_progress); builder.setView(view); builder.setNegativeButton(R.string.soft_update_cancel, new OnClickListener() {    @Override  public void onClick(DialogInterface dialog, int which) {  // TODO Auto-generated method stub  dialog.dismiss();  // 设置取消状态  cancelUpdate = true;  } }); mDownloadDialog = builder.create(); mDownloadDialog.show(); //下载文件 downloadApk(); }  /** * 下载APK文件 */ private void downloadApk() { // TODO Auto-generated method stub // 启动新线程下载软件 new DownloadApkThread().start(); } /** * 检查软件是否有更新版本 * @return */ public boolean isUpdate() { // 获取当前软件版本 int versionCode = getVersionCode(mContext); //把version.xml放到网络上，然后获取文件信息 InputStream inStream = ParseXmlService.class.getClassLoader().getResourceAsStream("version.xml"); // 解析XML文件。 由于XML文件比较小，因此使用DOM方式进行解析 ParseXmlService service = new ParseXmlService(); try {  mHashMap = service.parseXml(inStream); } catch (Exception e) {  // TODO: handle exception  e.printStackTrace(); } if(null != mHashMap) {  int serviceCode = Integer.valueOf(mHashMap.get("version"));  //版本判断  if(serviceCode > versionCode) {  return true;  } } return false; } /** * 获取软件版本号 * @param context * @return */ private int getVersionCode(Context context) { // TODO Auto-generated method stub int versionCode = 0; // 获取软件版本号，对应AndroidManifest.xml下android:versionCode try {  versionCode = context.getPackageManager().getPackageInfo(   "com.xiaowu.news", 0).versionCode; } catch (NameNotFoundException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } return versionCode; }  /** * 下载文件线程 * @author Administrator * */ private class DownloadApkThread extends Thread { @Override public void run() {  try  {  //判断SD卡是否存在，并且是否具有读写权限  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))  {   // 获取SDCard的路径   String sdpath = Environment.getExternalStorageDirectory() + "/";   mSavePath = sdpath + "download";   URL url = new URL(mHashMap.get("url"));   // 创建连接   HttpURLConnection conn = (HttpURLConnection) url.openConnection();   conn.connect();   // 获取文件大小   int length = conn.getContentLength();   // 创建输入流   InputStream is = conn.getInputStream();   File file = new File(mSavePath);   // 如果文件不存在，新建目录   if (!file.exists())   {   file.mkdir();   }   File apkFile = new File(mSavePath, mHashMap.get("name"));   FileOutputStream fos = new FileOutputStream(apkFile);   int count = 0;   // 缓存   byte buf[] = new byte[1024];   // 写入到文件中   do   {   int numread = is.read(buf);   count += numread;   // 计算进度条的位置   progress = (int) (((float) count / length) * 100);   // 更新进度   mHandler.sendEmptyMessage(DOWNLOAD);   if (numread <= 0)   {    // 下载完成    mHandler.sendEmptyMessage(DOWNLOAD_FINISH);    break;   }   // 写入文件   fos.write(buf, 0, numread);   } while (!cancelUpdate);//点击取消就停止下载   fos.close();   is.close();  }  } catch (MalformedURLException e)  {  e.printStackTrace();  } catch (IOException e)  {  e.printStackTrace();  }  // 取消下载对话框显示  mDownloadDialog.dismiss(); } }  /** * 安装APK文件 */ private void installApk() { File apkfile = new File(mSavePath, mHashMap.get("name")); if (!apkfile.exists()) {  return; } Intent i = new Intent(Intent.ACTION_VIEW); i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive"); mContext.startActivity(i); }}