Android Life Cycle Summary

Manage the life cycle of your activity

When the user browses, leaves and returns to the instance of your app,activity in different states of its life cycle to convert. For example: When your application first starts, it comes to the highlighted position in the system and receives the user's focus. (It comes to the foreground of the system and receives user focus.) in this process, when you load the user interface and other components, the Android system calls a series of raw Life cycle functions. If a user does an action that initiates another activity or switches to another app, in short, when your activity moves to the background (activity is no longer visible, but its instance and state are still intact), The system invokes another set of life cycle functions in your activity.

Android Life Cycle Summary