latency (Wafi Hasan)

MainActivity.java

package com.wafihasan.latency;

import android.annotation.SuppressLint;
import android.graphics.Color;
import android.os.Handler;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Locale;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

    final int WIN_SCORE = 2;
    String[] names = {"RED", "BROWN", "GREEN", "PURPLE", "YELLOW", "BLUE", "PINK"};
    String[] colours = {"#F44336", "#795548", "#4CAF50", "#9C27B0", "#FFEB3B", "#3F51B5", "#E91E63"};
    Random r = new Random();
    TextView p1Area, p2Area;
    Button button1, button2;
    Handler handler;
    Runnable runnable;
    int score1 = 0, score2 = 0, name_index, colour_index, i = 0;
    boolean winner = false, isCorrect = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if(getSupportActionBar()!=null){
            getSupportActionBar().hide();
        }

        handler = new Handler();

        p1Area = findViewById(R.id.p1Area);
        p2Area = findViewById(R.id.p2Area);
        button1 = findViewById(R.id.button1);
        button2 = findViewById(R.id.button2);

        displayLetsPlayDialog();

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isCorrect) {
                    p1Plus();
                } else {
                    p1Minus();
                }
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isCorrect) {
                    p2Plus();
                } else {
                    p2Minus();
                }
            }
        });
    }

    public void setColours() {
        runnable = new Runnable() {
            @Override
            public void run() {
                if (!winner) {
                    handler.postDelayed(runnable, 1000);
                    name_index = r.nextInt(names.length);
                    colour_index = r.nextInt(colours.length);
                    isCorrect = name_index == colour_index;
                    setTextColors();
                }
            }
        };
        handler.post(runnable);
    }

    private void checkForWin() {
        if (score1==WIN_SCORE || score2==WIN_SCORE){
            winner = true;
            Toast.makeText(getApplicationContext(), "we have a winner", Toast.LENGTH_LONG).show();
        }
    }

    private void setTextColors() {
        p1Area.setText(names[name_index]);
        p2Area.setText(names[name_index]);
        p1Area.setTextColor(Color.parseColor(colours[colour_index]));
        p2Area.setTextColor(Color.parseColor(colours[colour_index]));
    }

    public void p1Plus() {
        score1 += 1;
        button1.setText(String.format(Locale.getDefault(), "Score: %d", score1));
        checkForWin();
    }

    public void p2Plus() {
        score2 += 1;
        button2.setText(String.format(Locale.getDefault(), "Score: %d", score2));
        checkForWin();
    }

    public void p1Minus() {
        score1 -= 1;
        button1.setText(String.format(Locale.getDefault(), "Score: %d", score1));
        checkForWin();
    }

    public void p2Minus() {
        score2 -= 1;
        button2.setText(String.format(Locale.getDefault(), "Score: %d", score2));
        checkForWin();
    }

    private void displayLetsPlayDialog() {
        final AlertDialog builder = new AlertDialog.Builder(MainActivity.this).create();
        @SuppressLint("InflateParams")
        View v = LayoutInflater.from(MainActivity.this).inflate(R.layout.start_dialog, null);
        TextView tvPlay = v.findViewById(R.id.tv_start);
        builder.setView(v);
        builder.setCanceledOnTouchOutside(false);
        tvPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setColours();
                builder.dismiss();
            }
        });
        builder.show();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (handler != null) {
            handler.removeCallbacks(runnable);
        }
    }
}