MainActivity.java (kocka)

package com.example.Kalkulator;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import java.util.Random;

public class MainActivity3 extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

    ImageView dice;

    Random random = new Random();

    void baciKocku(){

        int i = random.nextInt(6) + 1;

        switch(i){

            case 1:
                dice.setImageResource(R.drawable.one);
                break;

            case 2:
                dice.setImageResource(R.drawable.two);
                break;

            case 3:
                dice.setImageResource(R.drawable.three);
                break;

            case 4:
                dice.setImageResource(R.drawable.four);
                break;

            case 5:
                dice.setImageResource(R.drawable.five);
                break;

            case 6:
                dice.setImageResource(R.drawable.six);
                break;

            // "R.drawable." + naziv slike kocke od vrijednosti 1-6
            // Izbrisati ^^
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dice = findViewById(R.id.kocka);

        dice.setOnClickListener(view -> {

            baciKocku();
        });
    }
}