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Let's start with a basic bit of Android coding so we can get an understanding of how it works. We'll use a simple calculator as our example, and this detailed example explains how it's all put together. In this example, we'll create a calculator for adding and subtracting two numbers. It's an easy program that is great for getting started.

Getting Started

To begin, open Android Studio, which is the most popular Integrated Development Environment (IDE) for developing Android apps. After you open Android Studio, create a new project with an empty activity and name it “My Calculator”. In the “design” view of the app you should be able to see a graphical layout of the app with a button, text field, and text box. Add a button, two text boxes, and a label to the app and assign the corresponding values to them.

Recipe Ingredients

• Android Studio IDE
• Java language
• XML markup
• Android SDK

Instructions

To start, create a method in the Java class that will do the addition. For example;

public static int add(int n1, int n2) 

   return n1 + n2;

Then in the main class, you should be able to see the layout for an OnClickListener for the button. This will enable you to set an action for when the button is clicked.

public void onClick()
   int n1 = Integer.parseInt(textfield1.getText().toString());
   int n2 = Integer.parseInt(textfield2.getText().toString());
   result.setText(String.valueOf(add(n1, n2)));

Inside the OnClickListener, you should parse the text fields that the user entered into an integer and then call the addition method you previously created. For example;

Now, you just need to add the code to show the result on the display. To do this, find the setText method in the layout and call it with the result. For example;

result.setText("The result is: " + String.valueOf(add(n1, n2)));

Finally, you'll need to run the app. To do so, you must either run it through the Android Studio emulator or install it on a physical device. To run it through the Android Studio emulator, you should be able to see the “Hello World” app on the emulator screen.

That's all there is to it! With just a few lines of code and a small understanding of the Android framework, you can create a functioning calculator in no time. Now that you've created a simple calculator, you can take your Android development skills to the next level and begin to build more complex apps.

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