public class EnableButtonActivity extends AppCompatActivity {

    Button btnA15;
    Button btnA25;
    Button btnReset;

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

        btnA15 = findViewById(R.id.btn_a_score_15);
        btnA25 = findViewById(R.id.btn_a_score_25);
        btnReset = findViewById(R.id.btn_reset);

        btnA15.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // give a score and then disable the score team A 15 button
                view.setEnabled(false);
            }
        });

        btnA25.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // give a score and then disable the score team A 25 button
                view.setEnabled(false);
            }
        });

        btnReset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // re-enalbe all the score button
                btnA15.setEnabled(true);
                btnA25.setEnabled(true);
            }
        });
    }
}