Android is free and open-source software; its source code is known as Android Open Source Project (AOSP), which is primarily licensed under the Apache License. However most Android devices ship with additional proprietary software pre-installed, most notably Google Mobile Services (GMS) which includes core apps such as Google Chrome, the digital distribution platform Google Play and associated Google Play Services development platform. Life Cycle is also considered to be one of the important topics to expect in a interview. Find more about android here

Life Cycle

• OnCreate(): It is called when activity is created. Using this, the views are created and data is collected from bundles.
• OnStart(): It is called if the activity is becoming visible to the user. It may be succeeded by onResume() if the activity comes to the foreground, or onStop() if it becomes hidden.
• OnResume(): It is called when the activity will start an interaction with the user.
• OnPause(): This is called when the activity is moving to the background but hasn’t been killed yet.
• OnStop(): This is called when an activity is no longer visible to the user.
• OnDestroy(): This is called when the activity is finished or destroyed.
• OnRestart(): This is called after the activity has been stopped, prior to it being started again.

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