Android Basics (i)

• Android Architecture Introduction

1. Android is a mobile development platform, hierarchy: Operating system (OS), middleware (middle Ware), Applications (application)

Specific:

Operating system (OS)--Various drivers, etc. Using Linux2.6 as the operating system

Various libraries (Libraries) and Android Runtime Environment (runtime)--various managers, libraries and virtual machines

Application System Framework (application framework)--manager, etc.

Apps (application)-Phone, browser, etc.

Note: A basic Android application can take advantage of the 5 parts of the application framework:

Activity (Activities)

Boradcast Intent Receiver (broadcast intent receiver)

Server (Service)

Content Provider (contents provider)

Intent and Intent filter (intent and intent filters)

• Activity (Activities)

1. The representation is a separate interface (screen), and each activity is a separate class;
2. This class displays a user interface composed of views and responds to the interface;
3. After opening a new interface, the previous interface is paused and placed on the stack, leaving all the interfaces in the stack: from the first to the last.

• Boradcast Intent Receiver (broadcast intent receiver)

• Server (Service)

• Content Provider (contents provider)

• Intent and Intent filter (intent and intent filters)

1. A dedicated intent for page switching;
2. Intent describes what the program wants to do;
3. Intent asked what to do, Intent filter describes what an activity can do with intent.

Android Basics (i)