The app displays a circular UI element that resembles a physical fan control, with settings for off (0), low (1), medium (2), and high (3). The CustomFanController app demonstrates how to create a custom view subclass by extending the View class. Use listeners to provide the custom view's behavior.Initialize the custom view with drawing and painting values.How to use listeners to handle user interaction with the custom view.How to draw a custom view that is circular in shape.How to extend View to create a custom view.How to create an app with an Activity and run it using Android Studio.This lesson shows you how to create a custom view from scratch by extending View. By extending View directly, you can create an interactive UI element of any size and shape by overriding the onDraw() method for the View to draw it.Īfter you create a custom view, you can add it to your activity layouts in the same way you would add a TextView or Button. To create a custom view you can either extend an existing View subclass (such as a Button or EditText), or create your own subclass of View. If none of the View subclasses meet your needs, you can create a View subclass known as a custom view.
You can use these subclasses to construct a UI that enables user interaction and displays information in your app. We recommend that you do all the codelabs in order, because they progress through tasks step-by-step.Īndroid offers a large set of View subclasses, such as Button, TextView, EditText, ImageView, CheckBox, or RadioButton. This codelab is part of a series that guides you through building custom views, drawing on a canvas, clipping canvas objects, and using shaders for cool effects. All the course codelabs are listed on the Advanced Android in Kotlin codelabs landing page. You'll get the most value out of this course if you work through the codelabs in sequence, but it is not mandatory. Import codelab is part of the Advanced Android in Kotlin course. P.S This project is developed in Eclipse 3.7, and tested with Android 2.3.3. In this tutorial, we will show you two Toast examples : Toast.makeText(getApplicationContext(), "msg msg", Toast.LENGTH_LONG).show() Toast.makeText(getApplicationContext(), "msg msg", Toast.LENGTH_SHORT).show()
In Android, Toast is a notification message that pop up, display a certain amount of time, and automtaically fades in and out, most people just use it for debugging purpose.Ĭode snippets to create a Toast message :
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