How to get the build/version number of your Android application?

Question

I need to figure out how to get or make a build number for my Android application. I need the build number to display in the UI.

Do I have to do something with

Answer 1

Example for inside Fragment usage.

        import android.content.pm.PackageManager;
        .......

        private String VersionName;
        private String VersionCode;
        .......


        Context context = getActivity().getApplicationContext();

        /*Getting Application Version Name and Code*/
        try
        {

             VersionName = context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionName;

             /*I find usefull to convert vervion code into String, so it's ready for TextViev/server side checks*/ 

             VersionCode = Integer.toString(context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionCode);
        } catch (PackageManager.NameNotFoundException e)
        {
             e.printStackTrace();
        }

// DO SOMETHING USEFULL WITH THAT