How to create a BMI( Body Mass Index) calculating App

 

Splash Screen Xml code:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    tools:context=".MainActivity2">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/bmi" />

   
</androidx.constraintlayout.widget.ConstraintLayout>

Splash Screen Java Code:

package com.programmingwithus786;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;

public class MainActivity2 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent i=new Intent(getApplicationContext(), MainActivity.class);
                startActivity(i);
                finish();

            }
        },3000);
    }
}
Main BMI App XML code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:id="@+id/layout"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <EditText
        android:id="@+id/weight"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Enter Your Weight "
        android:ems="15"
        android:inputType="number" />

    <EditText
        android:id="@+id/heightInFeet"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Enter Your Height (In feet)"
        android:ems="15"
        android:inputType="number" />

    <EditText
        android:id="@+id/heightInInches"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Enter Your Height (In inches)"
        android:ems="15"
        android:inputType="number" />

    <Button
        android:id="@+id/calculateBMI"
        android:layout_width="312dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Calculate body Mass " />

    <TextView
        android:id="@+id/result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="Result" />
</LinearLayout>
Main BMI App Java code:
package com.programmingwithus786;

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.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    EditText weight,heightInFeet,heightInInches;
    TextView result;
    Button calculateBMI;
    LinearLayout layout;


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

        weight=findViewById(R.id.weight);
        heightInFeet=findViewById(R.id.heightInFeet);
        heightInInches=findViewById(R.id.heightInInches);
        result=findViewById(R.id.result);
        calculateBMI=findViewById(R.id.calculateBMI);
        layout=findViewById(R.id.layout);

        calculateBMI.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

              int w8=Integer.parseInt(weight.getText().toString());
              int ft=Integer.parseInt(heightInFeet.getText().toString());
              int in=Integer.parseInt(heightInInches.getText().toString());

             int totalInches=ft*12 +in;
             double totalcm=totalInches*2.53;
             double totalm=totalcm/100;

            double bmi =w8/(totalm*totalm);
            if(bmi>25){
                result.setText("You're OverWeight !");
                layout.setBackgroundColor(getResources().getColor(R.color.red));
            }else if(bmi<18){
                result.setText("You're UnderWeight !");
                layout.setBackgroundColor(getResources().getColor( R.color.yellow));
                }else{
                result.setText("You're Healthy!");
                layout.setBackgroundColor(getResources().getColor( R.color.green));

            }



            }
        });

    }
}