Google Android

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Google Android mobile platform

Essential links:

• Android application fundamentals
• Common Android tasks
• Android platform versions
• Android package index

Activities

The application's presentation layer. Each and every screen in an application has to extend the Activity class. Activities use Views to make up graphical user interfaces.

Normally an activity represents a single screen in the application and generally contains one or more views.

Services

Background processes that run (potentially, for a long time) in the background.

Android defines two types of services:

• local: only accessible by the application that is hosting the service
• remote: accessible by other applications running on the device

Content providers

A standard mechanism for applications to share data between applications without actually exposing the underlying structure and implementation - by programming towards an interface. Basically, content providers enable your application to use data from other applications on the devices (and vice versa).

Activating components

Pending...

• Intents:
  • Activities
  • Services
  • Broadcast receivers
• Content providers:
  • ContentResolver request

Views

Views are the graphical user interface (GUI) elements that make up the basic building blocks of a user interface. Each component knows how to draw itself - views themselves are hierarchical.

The application manifest (AndroidManifest.xml)

The manifest file defines both the content and behaviour of the application. For example, it lists the application's activities, services, and corresponding permissions.