Android system architecture and execution process

Android system

A component is a basic function module that can be called. The Android app is made up of components.

Android System structure:

Activity : Complete basic function, visual interface = phone screen

Service: Background services, background operation, foreground application

Broadcastreceiver: Broadcast mechanism, groups that accept and respond to broadcast messages

ContentProvider: A set of interfaces, the only way to share data between applications, to store and retrieve data, and to think of an interface that his application provides access to data

Execution process:

Oncreate:acivity Initialization

Onstart:activity Display

Onrestart: Inactive state enters active state

Onresume: Data interaction

OnPause : Enter a paused state

Onstoop : Enter stop State

OnDestroy : Non-active

Android system architecture and execution process