How to Create a Dice Roller App in Android?

A dice roller application is a simple application that generates a random number between 1 and a specified maximum number, simulating the roll of a dice. The application is typically used by gamers or anyone who needs to roll a die but doesn’t have physical dice available. To create the app, you need to have a basic understanding of Java/Kotlin programming, Android app development, and UI design. There are plenty of online resources and tutorials available from GeeksforGeeks that can guide you through the process of creating an application in Android.

Step-by-Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. The code for that has been given in Kotlin Programming Language for Android.

Step 2: Working with the XML Files

The complete code of the activity_main.xml file is given below.

XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/dice_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        app:srcCompat="@drawable/empty_dice"
        tools:srcCompat="@drawable/dice_1" />

    <Button
        android:id="@+id/roll_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="@string/roll" />

</LinearLayout>

Step 3: Working with the MainActivity File

Go to the MainActivity File and refer to the following code. Since there is no change in MainActivity File, so keep it as it is.

Kotlin

import android.os.Bundle
import android.widget.Button
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import java.util.*

class MainActivity : AppCompatActivity() {

    lateinit var diceImage: ImageView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val rollButton: Button = findViewById(R.id.roll_button)
        rollButton.setOnClickListener {
            rollDice()
        }

        diceImage = findViewById(R.id.dice_image)
    }

    private fun rollDice() {
        val randomInt = Random().nextInt(6) + 1
        val drawableResource = when (randomInt) {
            1 -> R.drawable.dice_1
            2 -> R.drawable.dice_2
            3 -> R.drawable.dice_3
            4 -> R.drawable.dice_4
            5 -> R.drawable.dice_5
            else -> R.drawable.dice_6
        }

        diceImage.setImageResource(drawableResource)
    }
}

Output: