How to call the version number and displayed

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Get the current application version number:

 private String getVersionName () throws Exception 
{
/ / Get instance of 
 packagemanagerPackageManager packageManager = getPackageManager (); 
/ / GetPackageName () is the package name of your current class, 0 is to get the version information 
PackageInfo packInfo = packageManager.getPackageInfo (getPackageName (), 0); 
String version = packInfo.versionName; 
return version; 
} 

Get the current system version number:

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