Set a lock code for individual apps on Android Setting a lock code on an app-by-app basis is a great way to add another level of security to your device. With App Lock, it's as easy as setting a PIN.

This is a full tutorial explaining how to make a basic gallery app using RecyclerView, including full project code and resources.

Methods to Generate QR Codes on Android Using the following methods, you can conveniently generate QR codes on your Android device for personal and business purposes.