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This article introduces you how to analyze the Android program framework, the content is very detailed, interested friends can refer to, hope to be helpful to you.

The system architecture of the Android program framework is the same as its operating system, using a hierarchical architecture. From the architecture diagram, the Android program framework is divided into four layers: application layer, application framework layer, system runtime layer and linux core layer from high level to low level.

1. Application program

The Android framework is released with a series of core application packages, including email client, SMS short message program, calendar, map, browser, contact manager, etc. All applications are written in Java.

two。 Application framework

Developers also have full access to the API framework used by core applications. The architectural design of the application simplifies the reuse of components; any application can publish its functional blocks. And any other application can use the functional blocks it publishes (subject to the security restrictions of the framework). Similarly, the application reuse mechanism also enables users to easily replace program components.

Hidden behind each application is a range of services and systems, including:

◆ 's rich and extensible Views can be used to build applications, including lists (lists), grids (grids), text boxes (text boxes), buttons (buttons), and even embedded web browsers.

◆ content providers (Content Providers) enable applications to access data from another application, such as a contact database, or to share their own data

◆ Explorer (Resource Manager) provides access to non-code resources, such as local strings, graphics, and layout files (layout files).

The ◆ Notification Manager (Notification Manager) enables applications to display custom prompts in the status bar.

The ◆ activity Manager (Activity Manager) is used to manage the application lifecycle and provide common navigation fallback functions

On how to analyze the Android program framework to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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