[Android] How to call the version number and displayed

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------ Solution ---------------------------------------- ----
Gets the current application version number :

   private String getVersionName() throws Exception
     {
             // 获取packagemanager的实例
             PackageManager packageManager = getPackageManager();
             // getPackageName()是你当前类的包名，0代表是获取版本信息
             PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),0);
             String version = packInfo.versionName;
             return version;
     }

Gets the version number of the current system :

"Product Model: " + android.os.Build.MODEL + "," 
                  + android.os.Build.VERSION.SDK + "," 
                  + android.os.Build.VERSION.RELEASE