Program: main_activity.kt // Author: Tanu. In my case, the package name is, it might vary in your case. The main_activity.kt can be found in:Īpp → java → →MainActivity.kt

The code is pretty much self-explanatory. Then in the Equals function, I am using the Expression Builder library and calling its method Expression Builder to do the calculations. To do this, I have created a function called evaluateExpression() which does the appending job to the text view. Step 6: Actual Kotlin coding for the calculatorįirst, I’m appending 1, 2, 3,….0 when the users press the keys to the text view, respectively. It is a mechanical process because of multiple text views. I’m placing all the text view inside a linear layout. Here we can use the text view layout rather than buttons for the keys.

This is the main layout file here you need not use the UI editor, rather you can code the entire layout using XML. Step 4: Configuring the “activity_main.xml” file A style can be applied to an individual View (from within a layout file) or to an entire Activity or application (from within the manifest file).Īpp →res →values →styles.xml 0dp match_parent 1 21sp center 0.5dp 0dp match_parent 1 21sp center 0.5dp 0dp match_parent 1 21sp center 0.5dp 0dp match_parent 1 21sp center 0.5dp Īll the above are just style properties for the calculator defined in the styles.xml file. Click Finish to complete Installation.The style file is used to define the format or the look for a UI. Choose start menu folder and click Install.Ħ. In this tutorial, we are going to use IntelliJ IDEA for our Kotlin program development. The download links of these IDE's are given below. We can choose these IDE according to our compatibility.

There are various Java IDE available which supports Kotlin project development. Since, Kotlin runs on JVM, it is necessary to install JDK and setup the JDK and JRE path in local system environment variable. Next → ← prev Kotlin Environment Setup (IDE) Install JDK and Setup JDK path

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