To see how this works, let’s place just one toast message inside our function and then call it from button one:Run this and the code will behave precisely as it did before. Browse code samples directly in the browser During the previous lessons of this tutorial series you learnt about some fundamentals of Kotlin Android development such as variables, data types, functions and visibility modifiers. This is a “list” meaning that it is a variable that can contain multiple values – in this case multiple strings. A = 1, B = 2, and C = 3. Anyway I will provide the answer down below . We could do this with a second function, but better yet would be to place both messages inside a single function.To this end, we’re going to use two new concepts from Kotlin programming.Now you know how to use functions to group sections of code in Android, the next part of this Kotlin tutorial is where the real magic is going to happen. Kotlin Playground is an online sandbox to explore Kotlin programming language. In this tutorial series we will be developing Android app in kotlin language from scratch .Every previous tutorial will be updated to new code base on running . Also I want you to add validations to both buttons to avoid empty inputs . Now you’re going to learn three First, a variable is a “container” for data. But a quicker solution would be to use the “else” statement. I have set the value of Two buttons with ids “areaButton” and “circumferenceButton” will allow users to trigger calculations.Now, if you run the project with emulator you will see the home screen of the app.Before implementing UI controller (MainActivity for this scenario) , Let’s create a model class for calculations.In maths, to find the area and circumference of a circle we use a mathematical constant named “pi” . Now it’s time to do some practical exercises with the knowledge you gained. You’ll now see your game appear on the screen, and you’ll be able to select an answer. If we want to make this into a dynamic program that can show multiple questions and answers, then we need to add some logic. In this way, we can grab the next question along by incrementally increasing that value.Finally, we change our “right answer” condition to whatever the right entry in our list of right answers is.
“setText” for example is not an example of Kotlin, but rather it is part of an Android class (TextView). Now, when we subsequently call our function, we need to add a whole number inside the curly brackets:You can pass as many arguments into a function as you like, so long as you define them each and separate them with commas.In this case, we are going to assign each button to a number. To put this another way, a variable lets you use a word to represent another word, a number, or even a list of items. This is a full, working game, and you could create many more projects like it with the skills you learned here.The only slight issue with all this is that right now, the game will crash out as soon as you run out of questions!But rather than hand you the answer on a silver plate, I’m going to invite you to go off and find the answer yourself. Kotlin Here is the complete MainActivity.kt code after adding the validations.Congratulations ! It’s also less commonly used outside of Android, so many established developers still aren’t familiar with it.In this Kotlin tutorial, we’re going to walk through the process of building a simple Kotlin app – a quiz – that will serve as a jumping-off point to help you learn Kotlin at large. Android Jetpack and Advanced Architecture MasterclassAndroid Jetpack and Advanced Architecture MasterclassAndroid Jetpack and Advanced Architecture Masterclass>> Github Link To Download The Starter Project For This Lesson
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