[Android Studio] 비만도 계산기 만들기

안드로이드 스튜디오로 BMI 계산기 만들기

 

코드

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/Edit1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:hint="키(cm)" />

    <EditText
        android:id="@+id/Edit2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:hint="몸무게(kg)" />

    <Button
        android:id="@+id/BtnAdd"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="확인" />

    <TextView
        android:id="@+id/TextResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:textColor="#0000FF"
        android:textSize="20dp" />

</LinearLayout>

 

MainActivity.java

package com.cookandroid.test;

import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private EditText edit1, edit2;
    private Button btn1;
    private TextView textResult;
    private String height, weight, BMI, result2;
    private double result1;

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

        edit1 = findViewById(R.id.Edit1);
        edit2 = findViewById(R.id.Edit2);
        btn1 = findViewById(R.id.BtnAdd);
        textResult = findViewById(R.id.TextResult);

        btn1.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                height = edit1.getText().toString();
                weight = edit2.getText().toString();

 

비만도 계산 방법은 아래와 같다

 

신체질량지수(BMI) = 체중(kg) / [신장(m)]2

 

"Double.parseDouble(weight) / ((Double.parseDouble(height) / 100) * (Double.parseDouble(height) / 100));"

 

저체중< 20, 정상 20~24, 과체중 25~29, 비만>=30

 

                result1 = Double.parseDouble(weight) / ((Double.parseDouble(height) / 100) * (Double.parseDouble(height) / 100));
                if (result1 < 20) {
                    result2 = "저체중";
                } else if (result1 <= 24 && result1 > 20) {
                    result2 = "정상";
                } else if (result1 <= 30 && result1 > 24) {
                    result2 = "과체중";
                } else {
                    result2 = "비만";
                }
                String BMI = String.format("%.2f", result1);
                textResult.setText("귀하의 BMI = " + BMI + "이며, " + result2 + "입니다.");
                return false;
            }
        });
    }
}

 

 

결과