How can I write android java random number?

public class MainActivity extends AppCompatActivity {

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

        final Button roll_Button = findViewById(R.id.rollButton);
        final TextView result_TextView = findViewById(R.id.resutlsTextView);
        final SeekBar seekBar = findViewById(R.id.seekBar);

        roll_Button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Random rand = new Random();
                int nr = rand.nextInt(seekBar.getProgress() + 1);
                result_TextView.setText(Integer.toString(nr));
            }
        }

        );

    }
}

what is wrong here? Nothing is displayed on the screen when I click on ROLL. I written the code in Java. That is a problem with Android Studio?