How do I make a Kotlin login page?
To make a Kotlin login page, first of all, open your Android Studio and make a new Project. Name it “LoginApp” or give any name of your choice. Select KOTLIN as the default language for your project. Before start coding first define these colors in your “colors.
How do I use login activity?
Define a button with login text and set its onClick Property. After that define the function mentioned in the onClick property in the java file. In the java file, inside the method of onClick get the username and passwords text using getText() and toString() method and match it with the text using equals() function.
What does ?: Mean in Kotlin?
length ?: -1. If the expression to the left of ?: is not null , the Elvis operator returns it, otherwise it returns the expression to the right. Note that the expression on the right-hand side is evaluated only if the left-hand side is null .