How android.app.Application class work?

Issue

I want to know Application class behvaiour, how it work in following cases, any one have idea about it:

• How android.app.Application work,
• when it execute in lifecycle of application,
• how it interact with other app component like Activity/Service/Receiver.
• How it is usable to improve app performance/architectre?

Solution

• It starts when your application's process starts and ends when the system kills the process
• It cannot interact with them directly, your may use Broadcasts, or you can get the current Application instance with getApplicationContext()
• It is a singleton class which is available from every Activity, Service, etc. It's up to you how you use it

Answered By - pshegger