BMI calculator for men and women using Android

Hi All,

I have created this blog for calculate BMI(Body mass Index) for both men and women. Its a rare combinations to get BMI for both men and women. we can give input in terms of Feet/Inches-Lbs or Cms/Kgs. lets start how to create BMI calculator using android program.

step 1: Create a new android project.

File->New->Project->Android->Android application project













step 2: Create a new relative layout and add widgets(Edit text, text field,spinner,button)

Else copy the below code for layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/textGender"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/textsubheading"

        android:layout_below="@+id/textsubheading"

        android:text="GENDER"

        android:textColor="#055F7A"

        android:textStyle="bold" />

    <TextView

        android:id="@+id/textHeading"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentRight="true"

        android:layout_alignParentTop="true"

        android:text="Body Mass Index Calculator"

        android:textAppearance="?android:attr/textAppearanceLarge"

        android:textColor="#ff0000"

        android:textSize="22sp"

        android:textStyle="bold" />

    <TextView

        android:id="@+id/textsubheading"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/radiosex"

        android:layout_below="@+id/textHeading"

        android:text="Enter your information and click calculate my BMI to find your Body Mass Index(BMI)"

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:textSize="12sp" />

    <RadioGroup

        android:id="@+id/radiosex"

        android:layout_width="300dp"

        android:layout_height="40dp"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/textGender"

        android:orientation="horizontal" >

        <RadioButton

            android:id="@+id/radiomale"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="0.05"

            android:checked="true"

            android:text="@string/radio_male"  />

        <RadioButton

            android:id="@+id/radiofemale"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="0.08"

            android:text="@string/radio_female" />

    </RadioGroup>

    <TextView

        android:id="@+id/textheight"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/radiosex"

        android:layout_alignRight="@+id/textGender"

        android:layout_below="@+id/radiosex"

        android:text="HEIGHT"

        android:textColor="#055F7A"

        android:textStyle="bold" />

    

    <EditText

        android:id="@+id/feet"

        android:layout_width="60dp"

        android:layout_height="40dp"

        android:layout_alignLeft="@+id/textheight"

        android:layout_below="@+id/textheight"

        android:layout_marginTop="14dp"

        android:hint="Feet"

        android:ems="10"

        android:inputType="numberDecimal" />

    <EditText

        android:id="@+id/cms"

        android:layout_width="60dp"

        android:layout_height="40dp"

        android:layout_alignBaseline="@+id/feet"

        android:layout_alignBottom="@+id/feet"

        android:layout_marginLeft="28dp"

        android:layout_toRightOf="@+id/textheight"

        android:ems="10"

        android:hint="Cms"

        android:inputType="numberDecimal" />

    <Spinner

        android:id="@+id/heightspin"

        android:layout_width="120dp"

        android:layout_height="50dp"

        android:layout_alignBottom="@+id/cms"

        android:layout_alignRight="@+id/radiosex"

        android:layout_alignTop="@+id/cms"

        android:entries="@array/height_arrays" />

    <TextView

        android:id="@+id/textweight"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/feet"

        android:layout_marginTop="24dp"

    android:text="WEIGHT"

        android:textColor="#055F7A"

        android:textStyle="bold" />

    <EditText

        android:id="@+id/lbs"

        android:layout_width="60dp"

        android:layout_height="40dp"

        android:layout_alignParentLeft="true"

        android:layout_alignRight="@+id/feet"

        android:layout_below="@+id/textweight"

        android:layout_marginTop="16dp"

        android:ems="10"

        android:hint="Lbs"

        android:inputType="numberDecimal" >

        <requestFocus />

    </EditText>

    <TextView

        android:id="@+id/Lbstext"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@+id/lbs"

        android:layout_alignLeft="@+id/cms"

        android:layout_alignRight="@+id/cms"

        android:layout_alignTop="@+id/lbs"

        android:text="Lbs"

         android:textSize="17sp"

        android:textColor="#055F7A"

        android:textStyle="bold" />

    <Button

        android:id="@+id/claculate"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/lbs"

        android:layout_alignRight="@+id/heightspin"

        android:layout_below="@+id/lbs"

        android:layout_marginTop="15dp"

        android:background="@drawable/button"

        android:text="> CALCULATE MY BMI >"

        android:textColor="#ffffff"

        android:textStyle="bold" />

    <TextView

        android:id="@+id/result"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/claculate"

        android:layout_alignRight="@+id/claculate"

        android:layout_below="@+id/claculate"

        android:text=""

        android:textAppearance="?android:attr/textAppearanceMedium"

        android:textSize="15sp" />

</RelativeLayout>

Step 3: Your string.xml file should look like,

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="app_name">BMI</string>

    <string name="action_settings">Settings</string>

     <string name="radio_male">Male</string>

    <string name="radio_female">Female</string>

    <string name="hello_world">Hello world!</string>

        <string-array name="height_arrays">

        <item>Feet/Inches</item>

        <item>Cms</item>

    </string-array>

</resources>

Step 4: Copy the below code and paste it in your main activity,

package com.example.bmiinfinite;

import android.os.Bundle;

import android.app.ActionBar;

import android.app.Activity;

import android.graphics.Color;

import android.graphics.drawable.ColorDrawable;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.Spinner;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.Button;

import android.widget.EditText;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

public class MainActivity extends Activity {

private Spinner heightspin;

private EditText feet;

private EditText cms;

private EditText lbs;

private TextView Lbstext;

private TextView result;

private RadioGroup rg;

private RadioButton radioSexButton;

public int hfeet;

public int hinc;

public int wlbs;

public int wkgs;

public int hcms;

public float bmifeet;

public float bmicms;

public String bmifeetStatus;

public String bmicmsstatus;

public int selectedId;

public String spintext;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ActionBar bar = getActionBar();

bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#c0c0c0")));

heightspin = (Spinner) findViewById(R.id.heightspin);

feet = (EditText) findViewById(R.id.feet);

cms = (EditText) findViewById(R.id.cms);

lbs = (EditText) findViewById(R.id.lbs);

Lbstext = (TextView )  findViewById(R.id.Lbstext);

result = (TextView )  findViewById(R.id.result);

rg = (RadioGroup) findViewById(R.id.radiosex);

spintext= heightspin.getSelectedItem().toString();

ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,

R.array.height_arrays, android.R.layout.simple_spinner_item);

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

heightspin.setAdapter(adapter);

heightspin.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

    if(position ==0 )

   {

    feet.setVisibility(View.VISIBLE);

    cms.setHint("Inches");

    Lbstext.setText("Lbs");

    lbs.setHint("Lbs");

   }

    else

    {

    feet.setVisibility(View.GONE);

    cms.setHint("Cms");

    Lbstext.setText("Kgs");

    lbs.setHint("Kgs");

    }

}

@Override

public void onNothingSelected(AdapterView<?> arg0) {

// TODO Auto-generated method stub

}

});

final Button button = (Button) findViewById(R.id.claculate);

      button.setOnClickListener(new View.OnClickListener() {

          public void onClick(View v) {

          

      if (v.getId() == R.id.claculate )

{

          

        EditText feet = (EditText)findViewById(R.id.feet);

EditText inches = (EditText)findViewById(R.id.cms);

EditText lbs = (EditText)findViewById(R.id.lbs);

result = (TextView )  findViewById(R.id.result);

hfeet = Integer.parseInt(feet.getText().toString());

hinc = Integer.parseInt(inches.getText().toString());

wlbs = Integer.parseInt(lbs.getText().toString());

selectedId = rg.getCheckedRadioButtonId();

radioSexButton = (RadioButton) findViewById(selectedId);

if(spintext.equalsIgnoreCase("Feet/Inches") && selectedId == R.id.radiomale)

    {

bmifeet = lbsbmi(hfeet, hinc ,wlbs);

    bmifeetStatus = staBMI(bmifeet);

    result.setText("PRESENT STATUS :"+ String.format( "%.2f", bmifeet )  + "-" + bmifeetStatus);

 

    }

if(spintext.equalsIgnoreCase("Feet/Inches") && selectedId == R.id.radiofemale)

    {

   

    bmifeet = lbsbmi(hfeet, hinc ,wlbs);

    bmicmsstatus = fstaBMI(bmifeet);

    result.setText("PRESENT STATUS :"+ String.format( "%.2f", bmifeet )  + "-" + bmicmsstatus);

    }

    if(spintext.equalsIgnoreCase("Cms") && selectedId == R.id.radiomale)

    {

   

    bmicms = kgscbmi(hcms, wkgs);

    bmifeetStatus = staBMI(bmicms);

    result.setText("PRESENT STATUS :"+ String.format( "%.2f", bmicms )  + "-" + bmifeetStatus);

    }

 

    if(spintext.equalsIgnoreCase("Cms") && selectedId == R.id.radiofemale)

    {

   

    bmicms = kgscbmi(hinc, wlbs);

    bmicmsstatus = fstaBMI(bmicms);

   

    result.setText("PRESENT STATUS :"+ String.format( "%.2f", bmicms )  + "-" + bmicmsstatus);

    }

    else

    Toast.makeText(getApplicationContext(), "Please Put the values",

                                Toast.LENGTH_LONG).show();

 

}

       }

      });

}

private float lbsbmi(int feet, int inches, int lbs )

{

int inc= feet + (inches/12);

return (float) (lbs * 4.88 / (inc * inc));

}

private float kgscbmi (float cms,  float kgs)

{

float hgt = cms/100 ;

return (float) ( kgs / (hgt * hgt));

}

private String staBMI(float bmiValue) 

{

if (bmiValue < 18.5) {

    return "Underweight";

    } 

    else if (bmiValue < 25) {

    return "Normal";

   } else if (bmiValue < 30) {

    return "Overweight";

    } else {

    return "Obese";

    }

   }

 

private String fstaBMI(float bmiValue) 

{

if (bmiValue < 16.5) {

    return "Underweight";

    } 

    else if (bmiValue < 22) {

    return "Normal";

     

    } else if (bmiValue < 27) {

    return "Overweight";

    } else {

    return "Obese";

    }

   }

}

step 5: create a new emulator by sdk manager,

Step 6: Run your project on BMI emulator.

Here we are giving background color ar run-time using the below code, user may choose any color any paste it.

ActionBar bar = getActionBar();

bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#c0c0c0")));

Should you have any questions on above pl feel free to contact undersigned

Happy reading!

Thanks,

Divakar U