How will you track foreground and background events in android? Implementing a Foreground and Background Handler First, lets create our interface that will be implemented by a custom Application class. Something as simple as this: interface LifecycleDelegate { fun onAppBackgrounded() fun onAppForegrounded() } we could use onTrimMemory and the TRIM_MEMORY_UI_HIDDEN flag to detect background events. So lets do that now. Add this into the onTrimMemory method callback body if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) { // lifecycleDelegate instance was passed in on the constructor lifecycleDelegate.onAppBackgrounded() } So now we have the background event covered lets handle the foreground event. To do this we are going to use the onActivityResumed. This method gets called every time any Activity in your app is resumed, so this could be called multiple times if you have multiple Activities. What we will do is use a flag...