通用类_更新APK

判断apk是否为最新版本，否则下载最新apk，下载时开启新线程下载并显示进度条，最后安装

流程图：

package com.news.util;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 org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONObject;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.content.Intent;import android.content.pm.PackageManager.NameNotFoundException;import android.net.Uri;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.View;import android.widget.ProgressBar;import android.widget.Toast;import com.szy.news.service.SyncHttp;public class UpdateManager{/* 下载中 */private static final int DOWNLOAD = 1;/* 下载结束 */private static final int DOWNLOAD_FINISH = 2;/* 保存解析的XML信息 */HashMap<String, String> mHashMap = new HashMap<String, String>();/* 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;private Context mContext;/* 更新进度条 */private ProgressBar mProgress;private Dialog mDownloadDialog;private Handler mHandler = new Handler(){public void handleMessage(Message msg){switch (msg.what){// 正在下载case DOWNLOAD:// 设置进度条位置mProgress.setProgress(progress);break;case DOWNLOAD_FINISH:// 安装文件installApk();break;default:break;}};};public UpdateManager(Context context){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_LONG).show();}}/** * 检查软件是否有更新版本 *  * @return */private boolean isUpdate(){// 获取当前软件版本int localVersionCode = 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();    /** * 从服务器获取版本号 */SyncHttp syncHttp = new SyncHttp();String url = "http://10.0.2.2:8080/web/getSoftwareVersion";String retStr = new String();int serverVersionCode = 0;String name = new String();URL urlData;   try {retStr = syncHttp.httpGet(url, null);JSONObject jsonObject = new JSONObject(retStr); //得到第一层的json对象if(0 == jsonObject.getInt("ret")){mHashMap.put("name", jsonObject.getString("name"));mHashMap.put("url", jsonObject.getString("url"));serverVersionCode = Integer.parseInt(jsonObject.getString("version"));}else{   return false;}if(localVersionCode < serverVersionCode )return true;} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return false;}/** * 获取软件版本号 *  * @param context * @return */private int getVersionCode(Context context){int versionCode = 0;try{// 获取软件版本号，对应AndroidManifest.xml下android:versionCodeversionCode = context.getPackageManager().getPackageInfo("com.szy.news.activity", 0).versionCode;} catch (NameNotFoundException e){e.printStackTrace();}return versionCode;}/** * 显示软件更新对话框 */private void showNoticeDialog(){// 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(){@Overridepublic void onClick(DialogInterface dialog, int which){dialog.dismiss();// 显示下载对话框showDownloadDialog();}});// 稍后更新builder.setNegativeButton(R.string.soft_update_later, new OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){dialog.dismiss();}});Dialog noticeDialog = builder.create();noticeDialog.show();}/** * 显示软件下载对话框 */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 v = inflater.inflate(R.layout.softupdate_progress, null);mProgress = (ProgressBar) v.findViewById(R.id.update_progress);builder.setView(v);// 取消更新builder.setNegativeButton(R.string.soft_update_cancel, new OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){dialog.dismiss();// 设置取消状态cancelUpdate = true;}});mDownloadDialog = builder.create();mDownloadDialog.show();// 现在文件downloadApk();}/** * 下载apk文件 */private void downloadApk(){// 启动新线程下载软件new downloadApkThread().start();}/** * 下载文件线程 *  * @author coolszy *@date 2012-4-26 *@blog http://blog.92coding.com */private class downloadApkThread extends Thread{@Overridepublic void run(){try{if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))// 判断SD卡是否存在，并且是否具有读写权限{String sdpath = Environment.getExternalStorageDirectory() + "/";// 获得存储卡的路径mSavePath = sdpath + "download"; //mSavePath = /mnt/sdcard/downloadURL url = new URL(mHashMap.get("url"));HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 打开连接conn.connect(); //进行连接     int length = conn.getContentLength();// 获取待下载文件大小InputStream is = conn.getInputStream();// 创建输入流File file = new File(mSavePath); //mSavePath = /mnt/sdcard/downloadif (!file.exists())// 判断文件目录是否存在{file.mkdir();}File apkFile = new File(mSavePath, mHashMap.get("name"));FileOutputStream fos = new FileOutputStream(apkFile);int count = 0; //记录下载完成的大小byte buf[] = new byte[1024];// 缓存do   {     int numread = is.read(buf);// 写入到缓存中count += numread;progress = (int) (((float) count / length) * 100);// 计算进度条位置mHandler.sendEmptyMessage(DOWNLOAD);// 更新进度if (numread <= 0){mHandler.sendEmptyMessage(DOWNLOAD_FINISH);// 下载完成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;  }// 通过Intent安装APK文件Intent i = new Intent(Intent.ACTION_VIEW);i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");mContext.startActivity(i);}}