Categories

Oct 5, 2019 in Android

Q: please explain Android Core Building Blocks

1 Answer

Oct 5, 2019
Android Core Building Blocks

android components

An android component is simply a piece of code that has a well defined life cycle e.g. Activity, Receiver, Service etc.

The core building blocks or fundamental components of android are activities, views, intents, services, content providers, fragments and AndroidManifest.xml.

Activity

An activity is a class that represents a single screen. It is like a Frame in AWT.

View

A view is the UI element such as button, label, text field etc. Anything that you see is a view.

Intent

Intent is used to invoke components. It is mainly used to:

Start the service

Launch an activity

Display a web page

Display a list of contacts

Broadcast a message

Dial a phone call etc.

For example, you may write the following code to view the webpage.

Intent intent=new Intent(Intent.ACTION_VIEW);  

intent.setData(Uri.parse("http://www.javatpoint.com"));  

startActivity(intent);  

 

Service

Service is a background process that can run for a long time.

There are two types of services local and remote. Local service is accessed from within the application whereas remote service is accessed remotely from other applications running on the same device.

Content Provider

Content Providers are used to share data between the applications.

Fragment

Fragments are like parts of activity. An activity can display one or more fragments on the screen at the same time.

AndroidManifest.xml

It contains informations about activities, content providers, permissions etc. It is like the web.xml file in Java EE.

Android Virtual Device (AVD)

It is used to test the android application without the need for mobile or tablet etc. It can be created in different configurations to emulate different types of real devices.
Click here to read more about Android
Click here to read more about Insurance

Related questions

Madanswer
Oct 12, 2019 in Cloud Computing
Oct 7, 2019 in Android
Oct 7, 2019 in Android
...