【Java】How to Use SeekBar 2

MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        TextView textView = findViewById(R.id.textView);
        SeekBar seekbar = findViewById(R.id.seekbar);
        Button button = findViewById(R.id.button);

        // 初期値を表示
        textView.setText(seekbar.getProgress() + "");
    }
}