MemoriaActivity.java

package com.example.youdothemath;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Chronometer;
import android.widget.GridView;
import android.widget.TextView;
import android.widget.Toast;

public class MemoriaActivity extends Activity {
    private GridView mGrid;
    private GridAdapter mAdapter;
    private TextView mStepCount;
    private Chronometer mTimerScore;
    private Integer stepCount; // кол-во ходов

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_memoria);

        mStepCount = findViewById(R.id.guessedview);
        mTimerScore = findViewById(R.id.timerview);

        stepCount = 0;
        mStepCount.setText(stepCount.toString());

        mTimerScore.start();

        mGrid = findViewById(R.id.field);
        mGrid.setNumColumns(6);
        mGrid.setEnabled(true);

        mAdapter = new GridAdapter(this, 6, 6);
        mGrid.setAdapter(mAdapter);

        mGrid.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                mAdapter.checkOpenCells();

                if (mAdapter.openCell(position)) {
                    stepCount++;
                    mStepCount.setText(stepCount.toString());
                }

                if (mAdapter.checkGameOver()) {
                    mTimerScore.stop();
                    String time = mTimerScore.getText().toString();
                    String textScore = "Игра закончена\n\nХодов: " + stepCount.toString() + "\n\nВремя: " + time;
                    Toast.makeText(getApplicationContext(), textScore, Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}