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When versioning your application, you use the AndroidManifest.xml to specify the versionCode and versionName. You can read your application’s versionCode and versionName from you activity using the following code: PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0); int versionNumber = packageInfo.versionCode; String versionName = packageInfo.versionName; To know more about versioning your app read de documentation.

This code snippet shows how to get a reference to a preference in PreferenceActivity. With this reference, you could update the UI without reloading the PreferenceActivity. Source: Update preference value without reloading PreferenceActivity