MyAplication/MainActivity

package com.example.goodiny.myapplication;

import android.content.Context;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    LinearLayout first_layout, second_layout, third_layout;
    TextView countryName_text;
    Button first_btn;
    Context context;
    int click_counter = 0;

    //arrays should have the same length
    int[] first_bgColor = {Color.RED, Color.BLUE, Color.WHITE, Color.RED, Color.RED, Color.RED, Color.YELLOW, Color.RED, Color.GREEN, Color.YELLOW};
    int[] second_bgColor = {Color.YELLOW, Color.WHITE, Color.BLUE, Color.WHITE, Color.BLUE, Color.WHITE, Color.WHITE, Color.WHITE, Color.WHITE, Color.BLUE};
    int[] third_bgColor = {Color.RED, Color.BLUE, Color.RED, Color.RED, Color.YELLOW, Color.BLACK, Color.GREEN, Color.BLUE, Color.BLUE, Color.RED};
    String[] country_name = {"Spain", "Israel", "Russia", "Austria", "Armenia", "Egypt", "India", "Netherlands", "Sierra Leone", "Colombia"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //set pointer to objects from main layout
        setPointer();
    }

    private void setFlagsAndName() {
        //set parameters to all objects from arrays
        first_layout.setBackgroundColor(first_bgColor[click_counter]);
        second_layout.setBackgroundColor(second_bgColor[click_counter]);
        third_layout.setBackgroundColor(third_bgColor[click_counter]);
        countryName_text.setText(country_name[click_counter]);
        //fist increase counter
        click_counter += 1;
        //if counter more than last element index of array turn it to 0 else save counter with it's current value
        click_counter = click_counter == first_bgColor.length ? 0 : click_counter;
    }

    private void setPointer() {
        this.context = this;
        //setting pointers
        first_layout = findViewById(R.id.layout_first);
        second_layout = findViewById(R.id.layout_second);
        countryName_text = findViewById(R.id.countryName_text);
        third_layout = findViewById(R.id.layout_third);
        first_btn = findViewById(R.id.first_btn);
        //listen to click event on first_btn Button
        first_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //set color and names of countries
                setFlagsAndName();
            }
        });
    }
}