Android 在线更新apk

1.获取当前包的信息：

 1 PackageManager manager = Main.this.getPackageManager();
 2 try {
 3     PackageInfo info = manager.getPackageInfo(Main.this.getPackageName(), 0);
 4     String appVersion = info.versionName; // 版本名
 5     currentVersionCode = info.versionCode; // 版本号
 6     System.out.println(currentVersionCode + " " + appVersion);
 7 } catch (NameNotFoundException e) {
 8    // TODO Auto-generated catch blockd
 9    e.printStackTrace();
10 }
11 //上面是获取manifest中的版本数据，使用了versionCode
12 //在从服务器获取到最新版本的versionCode,比较
13 showUpdateDialog();

2.直接启动线程进行下载管理并安装：

 private void showUpdateDialog() {
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("检测到新版本");
         builder.setMessage("是否下载更新?");
         builder.setPositiveButton("更新", new DialogInterface.OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 // TODO Auto-generated method stub                 showDownloadDialog();
　　　　　　　　　　  dialog.dismiss();
             }
         }).setNegativeButton("稍后更新", new DialogInterface.OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 // TODO Auto-generated method stub
 　　　　　　　　　dialog.dismiss();
             }
         });
         builder.show();
     }

3.弹出下载更新进度框，进行apk下载更新：

 private void showDownloadDialog(){
         AlertDialog.Builder builder = new Builder(mContext);
         builder.setTitle("软件版本更新");

         final LayoutInflater inflater = LayoutInflater.from(mContext);
         View v = inflater.inflate(R.layout.progress, null);
         mProgress = (ProgressBar)v.findViewById(R.id.progress);

         builder.setView(v);
         builder.setNegativeButton("取消", new OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 dialog.dismiss();
                 interceptFlag = true;
             }
         });
         downloadDialog = builder.create();
         downloadDialog.show();

         downloadApk();
     }

4.启动线程进行下载任务：

  /**
      * 下载apk
      */

     private void downloadApk(){
         downLoadThread = new Thread(mdownApkRunnable);
         downLoadThread.start();
     }

5.对于下载更新进度框的控制：interceptFlag

 private Runnable mdownApkRunnable = new Runnable() {
         @Override
         public void run() {
             try {
                 URL url = new URL(apkUrl);

                 HttpURLConnection conn = (HttpURLConnection)url.openConnection();
                 conn.connect();
                 int length = conn.getContentLength();
                 InputStream is = conn.getInputStream();

                 File file = new File(savePath);
                 if(!file.exists()){
                     file.mkdir();
                 }
                 String apkFile = saveFileName;
                 File ApkFile = new File(apkFile);
                 FileOutputStream fos = new FileOutputStream(ApkFile);

                 int count = 0;
                 byte buf[] = new byte[1024];

                 do{
                     int numread = is.read(buf);
                     count += numread;
                     progress =(int)(((float)count / length) * 100);
                     //更新进度
                     mHandler.sendEmptyMessage(DOWN_UPDATE);
                     if(numread <= 0){
                         //下载完成通知安装
                         mHandler.sendEmptyMessage(DOWN_OVER);
                         break;
                     }
                     fos.write(buf,0,numread);
                 }while(!interceptFlag);//点击取消就停止下载.

                 fos.close();
                 is.close();
             } catch (MalformedURLException e) {
                 e.printStackTrace();
             } catch(IOException e){
                 e.printStackTrace();
             }

         }
     };

6.进行提示框进度条更新：

 private Handler mHandler = new Handler(){
         public void handleMessage(Message msg) {
             switch (msg.what) {
             case DOWN_UPDATE:
                 mProgress.setProgress(progress);
                 break;
             case DOWN_OVER:

                 installApk();
                 break;
             default:
                 break;
             }
         };
     };

7.下载完成，进行apk安装：

  /**
      * 安装apk
      */
     private void installApk(){
         File apkfile = new File(saveFileName);
         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);

     }