（android实战）应用在线版本更新

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="TP.NationalTest"
      android:versionCode="4"
      android:versionName="1.4">
    <uses-sdk android:minSdkVersion="4" />

/*检测应用版本*/
    private void CheckAppEdtion()
    {
        //判断网络连接，如连接
          //Step One  判断当前是否有网络连接,
        if(!NetWorkUtility.CheckConnection(this))
        {
            return;
        }
        //获取网络平台的版本信息
        CAppInfo model=AppDataServiceHelper.GetAppEdtionInfo(ProjectConstant.AppID);

        //比较版本信息，有新版本 弹出 对话框
        
        if(model!=null)
        {

         try {   
             PackageInfo info = this.getPackageManager().getPackageInfo(this.getPackageName(), 0);   
             int oldVersion = info.versionCode;
             int newVersion = Integer.parseInt(model.Edition);
             if(newVersion > oldVersion){   
                  //创建更新对话框，并弹出
                 AppUpdateDialog.CreateRegisterAlert(this);
                 }  
             } catch (Exception e) {   
             // TODO Auto-generated catch block   
             e.printStackTrace();   
            } 
        }
    }

static ProgressDialog  m_Dialog;
    static Context m_context=null ;
    static AlertDialog appupdatedialog=null;
    /*创建查看单题对话框*/
    public static void CreateRegisterAlert(Context context)
    {
         m_context=context;
          Dialog dialog = new AlertDialog.Builder(context).setTitle("系统更新")   
          .setMessage("已有新版本，是否更新？")   
          .setPositiveButton("确定",new DialogInterface.OnClickListener() {    
              public void onClick(DialogInterface dialog, int which) {   
                 m_Dialog=ProgressDialog.show(m_context, "请等待...", "正在更新，请稍后...",true);
                 mRegsiterHandler.sleep(1000);
              }   
          })   
          .setNegativeButton("取消", new DialogInterface.OnClickListener() {    
              public void onClick(DialogInterface dialog, int which) {   
                
              }   
          }).create();   
      dialog.show();   
    }

/*
     *定时注册程序
     * */
    private static RegsiterHandler mRegsiterHandler = new RegsiterHandler();
    
   static  class RegsiterHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            try{
                String url="http://xx.xx.xx.xx/gointel/nationaltest.html";
                HttpClient client = new DefaultHttpClient();     
                HttpGet get = new HttpGet(url);     
                HttpResponse response;     
                
                 response = client.execute(get);     
                 HttpEntity entity = response.getEntity();     
                    long length = entity.getContentLength();     
                    InputStream is = entity.getContent();     
                    FileOutputStream fileOutputStream = null;     
                    if (is != null) {     
     
                        File file = new File(Environment     
                                .getExternalStorageDirectory(), "nationaltest.apk");     
                        fileOutputStream = new FileOutputStream(file);     
                       
     
                        byte[] buf = new byte[1024];     
                        int ch = -1;     
                        while ((ch = is.read(buf)) != -1) {     
                            fileOutputStream.write(buf, 0, ch);     
                        }     
     
                    }     
                    fileOutputStream.flush();     
                    if (fileOutputStream != null) {     
                        fileOutputStream.close();     
                    }  
                    
            }
             catch(Exception ex)
              {
                
               }
            finally{
                m_Dialog.cancel();
            }
            install();
            
        }
        public void sleep(long delayMillis) {
            this.removeMessages(0);
            sendMessageDelayed(obtainMessage(0), delayMillis);
        }
    };
   
    
    private static void install() {       
        Intent i = new Intent();   
        //i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
        i.setAction(Intent.ACTION_VIEW);       
        i.setDataAndType(Uri.fromFile(new File("/sdcard/nationaltest.apk")),       
                "application/vnd.android.package-archive");       
        m_context.startActivity(i);     
        //finish();   
    }