Android Development

 asappstudio Build your first app

This section describes how to build a simple Android
app. First, you learn how to create a "Hello, World!"
project with Android Studio and run it. Then, you create
a new interface for the app that takes user input and
switches to a new screen in the app to display it.

Before you start, there are two fundamental concepts
that you need to understand about Android apps: how
they provide multiple entry points, and how they adapt
to different devices.

Apps provide multiple entry points
Android apps are built as a combination of components
that can be invoked individually. For example, an
activity is a type of app component that provides a user
interface (UI).

The "main" activity starts when the user taps your app's
icon. You can also direct the user to an activity from
elsewhere, such as from a notification or even from a
different app.

Other components, such as WorkManager, allow your
app to perform background tasks without a UI.

After you build your first app, you can learn more about
the other app components at Application
fundamentals.

Apps adapt to different devices
Android allows you to provide different resources for
different devices. For example, you can create different
layouts for different screen sizes. The system
determines which layout to use based on the screen
size of the current device.


If any of your app's features need specific hardware,
such as a camera, you can query at runtime whether
the device has that hardware or not, and then disable
the corresponding features if it doesn't. You can specify
that your app requires certain hardware so that Google
Play won't allow the app to be installed on devices
without them.

After you build your first app, learn more about device
configurations at Device compatibility overview.
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