Boca: MainActivity.java

package com.example.Kalkulator;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Vibrator;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.Toast;

import java.util.Random;

public class MainActivity5 extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

    int spinner_selected = 0;

    private ImageView boca;

    private Random r = new Random();

    private int lastDir;

    private boolean vrti;

    Spinner spinner3;

    public void otvoriMainActivity(){

        Vibrator v = (Vibrator) getSystemService(VIBRATOR_SERVICE);

        v.vibrate(1);

        Intent intent = new Intent(this, MainActivity.class);

        startActivity(intent);
    }

    public void otvoriMainActivity2(){

        Vibrator v = (Vibrator) getSystemService(VIBRATOR_SERVICE);

        v.vibrate(1);

        Intent intent = new Intent(this, MainActivity2.class);

        startActivity(intent);
    }

    public void otvoriMainActivity3(){

        Vibrator v = (Vibrator) getSystemService(VIBRATOR_SERVICE);

        v.vibrate(1);

        Intent intent = new Intent(this, MainActivity3.class);

        startActivity(intent);
    }

    public void otvoriMainActivity4(){

        Vibrator v = (Vibrator) getSystemService(VIBRATOR_SERVICE);

        v.vibrate(1);

        Intent intent = new Intent(this, MainActivity4.class);

        startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main5);

        boca = findViewById(R.id.boca);

        spinner3 = findViewById(R.id.spinner3);

        ArrayAdapter<CharSequence> adapter3 = ArrayAdapter.createFromResource(this, R.array.menu_MainActivity5, R.layout.dropdown_button);

        adapter3.setDropDownViewResource(R.layout.dropdown_item);

        spinner3.setAdapter(adapter3);

        spinner3.setOnItemSelectedListener(this);
    }

    public void spinBottle(View v) {

        if (!vrti) {

            int newDir = r.nextInt(1800);

            float pivotX = boca.getWidth() / 2;

            float pivotY = boca.getHeight() / 2;

            Animation rotate = new RotateAnimation(lastDir, newDir, pivotX, pivotY);

            rotate.setDuration(2500);

            rotate.setFillAfter(true);

            rotate.setAnimationListener(new Animation.AnimationListener() {

                @Override
                public void onAnimationStart(Animation animation) {
                    vrti = true;
                }

                @Override
                public void onAnimationEnd(Animation animation) {

                    SingleToast.show(getApplicationContext(), "Animacija je gotova!", Toast.LENGTH_SHORT);

                    vrti = false;
                }

                @Override
                public void onAnimationRepeat(Animation animation) {

                }
            });

            lastDir = newDir;

            boca.startAnimation(rotate);
        }

        else {
            SingleToast.show(getApplicationContext(), "Animacija nije gotova!", Toast.LENGTH_SHORT);
        }
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        String text = parent.getItemAtPosition(position).toString();

        if (spinner_selected > 0) {

            switch (text) {

                case "\uD83E\uDDEE":

                    otvoriMainActivity();

                    SingleToast.show(getApplicationContext(), text, Toast.LENGTH_SHORT);

                    break;

                case "\uD83D\uDCCF":

                    otvoriMainActivity2();

                    SingleToast.show(getApplicationContext(), text, Toast.LENGTH_SHORT);

                    break;

                case "\uD83C\uDFB2":

                    otvoriMainActivity3();

                    SingleToast.show(getApplicationContext(), text, Toast.LENGTH_SHORT);

                    break;

                case "\uD83E\uDE99":

                    otvoriMainActivity4();

                    SingleToast.show(getApplicationContext(), text, Toast.LENGTH_SHORT);

                    break;
            }
        }

        spinner_selected++;
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
}