Android 4.2 introduced a variety of user-facing features and improvements, such as lock-screen widgets, Daydream, support for RTL layouts, and others. It also introduced a number of important security enhancements for users and developers.

The post below recaps key security features in Jelly Bean that all developers should know about. Whether you are targeting Android 4.2 or earlier versions, it's a good idea to validate the areas covered in this post in order to to make your app more secure and robust. 
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