מחשבון BMI, פעולות JAVA

package com.example.mybmicalculator16092022;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;


import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    // 1
    private EditText etWeight, etHight;
    private Button btnCalculate;
    private TextView tvResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 0
        setContentView(R.layout.activity_main);

        // 3
        etWeight = findViewById(R.id.etWeight);
        etHight = findViewById(R.id.etHight);
        btnCalculate = findViewById(R.id.btnCalculate);
        tvResult = findViewById(R.id.tvResult);

        // 4 init
        tvResult.setText("");
    }

    public void calculateBmi(View view) {
        String weightStr = etWeight.getText().toString();
        String hightStr = etHight.getText().toString();

        double weight = Double.parseDouble(weightStr);
        double hight = Double.parseDouble(hightStr);

        double bmi = Math.round(weight / (hight * hight));

        if (bmi < 18.5) {
            tvResult.setText("The result is " + bmi + "\nUnderWeight");
            tvResult.setTextColor(Color.CYAN);
        } else if (bmi < 25) {
            tvResult.setText("The result is " + bmi + "\nNormal");
            tvResult.setTextColor(Color.GREEN);
        } else if (bmi < 30) {
            tvResult.setText("The result is " + bmi + "\nOverWeight");
            tvResult.setTextColor(Color.YELLOW);
        } else {
            tvResult.setText("The result is " + bmi + "\nObese");
            tvResult.setTextColor(Color.RED);
        }
    }
}