How to create a Popup Window in Android using Kotlin

How to create a Popup Window in Android using Kotlin

Today, I’m going to show you how to create very easy a nice popup window with a semi-transparent background!

In this example I’m using CardView to have rounded corners in the popup window. If you don’t like it, and you want to use something else (RelativeLayout, FrameLayout e.t.c), just skip the next step.

Adding the CardView library

If you like your popup window to have rounded corners, add the cardView library to your build.gradle of your app module

Creating the Popup Window Activity

Create a new Empty Activity in your project. In this example, we call it PopUpWindow

Go to the xml layout and paste the following code:

Go to your activity file (PopUpWindow.kt) and disable Activity’s open/close animation by giving the number 0 on the overridePendingTransition before the setContentView

Use Bundle to get the data we’ll pass later on when we call the popup window from the MainActivity

Set the data to the TextViews and Button

Make the status bar appearance transparent at different API levels

Create a fade animation for the popup window background when the Activity starts

Create the fade animation for the popup window too

Close the popup window with fade animation when you press the ‘OK’ button or the back button on your device.

Using the Popup Window

To use the popup window, just pass the values for the Title, Text, Button text and Status Bar appearance.

In this example, when you press the button in the MainActivity, it shows the popup window with title ‘Error’ and text ‘Sorry, that email address is already used!’

You can find the final project here

If you have any questions feel free to DM me on Twitter @johncodeos or leave a comment below!

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