Securing Android apps

- Before looking at the security features…built into all Android apps, let's take…a deeper look at the four components of an app.…An activity is the entry point for user interaction,…and has an associated user interface screen.…It can start another activity or service through an intent,…and is used to manage navigation through the app.…An activity goes through a number of states, and must…declare call-backs to handle the transitions between them.…The most common, the first one you see when…creating an Android app, is the OnCreate function.…

Other functions include OnStart, OnResume, OnPause,…OnStop, OnRestart, and OnDestroy.…The second component that may appear…in an app is a service.…These are long-running background operations…which have no use interface.…Like activities, services are declared in the manifest,…and have call-back functions to control their transitions.…They'll eventually call the StopSelf function to close down.…A broadcast receiver component is used to send…or receive broadcast messages from the…