如何实现一个简单的点击增加积分再升级的功能

Layout:

MainActivity

package com.example.userrecyclerviewapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;


import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {
  private TextView txt,level_num;
  private ProgressBar pb;
  private Button start;
  private int level = 1 ;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        level_num = findViewById(R.id.level_num);
        txt = findViewById(R.id.txt);
        pb = findViewById(R.id.progressBar);
        start = findViewById(R.id.start);
        pb.getProgressDrawable().setColorFilter(Color.YELLOW,android.graphics.PorterDuff.Mode.SRC_IN);
        initEvent();

    }

    private void initEvent() {
    start.setonClickListener(new View.onClickListener() {
        @Override
        public void onClick(View v) {
            int progress = pb.getProgress();
            int real_num = progress/10;


            if(real_num <10){
                progress = progress+10;
                txt.setText(String.valueOf(real_num));
                pb.setProgress(progress);
            }else {
                pb.setProgress(0);
                txt.setText("0");
                level++;
                level_num.setText(String.valueOf(level));

            }

        }
    });

}

}