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As we have already learned the basics about Button now we discuss about the CheckBox in Android

Read Working with Buttons in Android

Working With CheckBox is similar to that of Button.

Create a new Project and drag and drop a Checkbox

Then after that type the following code


isChecked   is a Boolean variable which gives two results on clicking the checkbox it gives true and when it is unchecked it gives false.

The Output will be





Read How to Develop a BMI calculator App.

Download the Source Code for this BMI calculator

Downlod APK

I make this post simple as possible in the coding point of view.

You can read what is BMI and what is the formula to calculate our Body Mass Index.

I am simply explaining how to develop a BMI Calculator Android App.

Just read my previous posts like How to work with Buttons, How to add two numbers in Android and a Simple Calculator app.

If you have practiced the above examples it will be easy for you to do this BMI calculator app.

Create a new Project, drag and drop 2 Edittext to enter the height and weight, a button to calculate and a TextView to display the result also use the Hint.



After register the button, Edittext and Textview in MainActivity.java



After that write the below code inside the onClick()

@Override
    public void onClick(View arg0)
    {
       
       
        final DecimalFormat df2 = new DecimalFormat(".##");
        Double weight,height,heightinmeter,bmi,finalht;
        weight=Double.parseDouble(wt.getText().toString());
        height=Double.parseDouble(ht.getText().toString());
        heightinmeter=height*0.3048;
        finalht=heightinmeter*heightinmeter;
        bmi=weight/finalht;
        bmival.setText(""+df2.format(bmi));
       
        if(bmi<18.5)
         {
             res.setText("underweight");
         }
         else if(bmi>18.5&&bmi<24.9)
         {
             res.setText("normal weight");
         }
         else if(bmi>25&&bmi<29.9)
         {
             res.setText("overweight");
         }
         else if(bmi>30&&bmi<39.9)
         {
             res.setText("obesity");
         }
         else if(bmi>40)
         {
             res.setText("severe obesity");
         }
       
       
    }



  final DecimalFormat df2 = new DecimalFormat(".##");

this line is used to print only two digits after the dot for ex: 21.23 

heightinmeter=height*0.3048;
this line will convert your height in feet to height in meter

  Formula for calculating:

        heightinmeter=height*0.3048;// meter=feet*0.3048
        finalht=heightinmeter*heightinmeter;// height=meter*meter
        bmi=weight/finalht; // bmi=weight/height