Kotlin Android Button
Android Button is a push button used to perform events on its click. It is a UI component comes under the android.widget.Button class. To learn more about Android Button refers to Android Button Example
Using Kotlin, we can perform events on Android Button though different ways, using:
1. Implement the setOnClickListener of Button
2. Implement the View.OnClickListner and override its function
3. Adding the onClick attribute of Button in layout file and implement its function.
4. Create a Button programmatically and set it on the layout
Kotlin Android Button Example
In this example, we will create the Button and performs event on them. Clicking on the Button, display a toast message.
Add the three Button from the Widgets palette in the activity_main.xml layout file. Its code is given below. The Button of id button3 added the onClick attribute and its function name is implemented in MainActivity class file.
Add the following code in the MainActivity.kt class. In this class, we implement the setOnClickListener listener on the button, implements the OnClickListener of View class (View.OnClickListener) and override its function onClick. In this class, we also create a Button programmatically (button4), define its properties and set it on the layout.