create a body mass index calculator javascript

#Create a body mass index calculator javascript how to#
#Create a body mass index calculator javascript update#
#Create a body mass index calculator javascript full#
#Create a body mass index calculator javascript for android#
#Create a body mass index calculator javascript code#

Underneath this TextView, we will add another TextView that will be used for displaying the calculated BMI value. Inside this CardView, we will show a TextView with the text of “BMI” centered inside the CardView.

#Create a body mass index calculator javascript full#

We will add a CardView widget that will take up the full width of the screen. Next, we will add a Button with the label of “Calculate” which when selected will calculate the BMI and display the results underneath.įor that last part of the Activity layout we will add some UI elements for displaying the calculated BMI results. Underneath that TextView there will be two EditText widgets that also only accept decimal numbers that will be used for capturing the weight in kilograms or in pounds. There will be TextView with the text of “Weight” centered inside the CardView. The CardView on the right side will contain the weight information. Later inside the Main Activity class, we will control the display of these EditText widgets based on whether the user has chosen to use the metric measurement system or the imperial system using the ToggleButton. There will also be a LinearLayout with a horizontal orientation containing two EditText widgets for capturing the height in feet and inches. Underneath the TextView there will be an EditText for capturing the height in centimeters which only accepts decimal numbers via the attribute value of “android:inputType” set to “numberDecimal”. There will be TextView with the text of “Height” centered inside the CardView. The CardView on the left side will contain the height information. These CardView widgets will be used for populating the height and weight information.īoth will the following attribute values populated to give the the CardView widgets rounded corners with a margin in between: Next, we will add LinearLayout with a horizontal orientation and we will place two CardView widgets that will sit next to each other. We will default it to the metric system by setting the “android:checked” attribute value to “true” and setting the “android:textOn” attribute value to “Metric Units” and “android:textOff” to “Imperial Units”. Then, we will add a ToggleButton that we will use for toggling between the metric system and the imperial system of measurements for weight and height. We will center the TextView horizontally by setting the “android:gravity” attribute to “center_horizontally”. In the layout resource file for this Activity activity_main.xml, we will add the following user interface elements inside a LinearLayout with a vertical orientation.įirst, we will add a TextView inside the LinearLayout, that will display the title of the app as “BMI Calculator”. We will be using a single Activity for the BMI calculator app. See a sample of the styles.xml resource file that has removed the Action Bar below.

#Create a body mass index calculator javascript update#

Once the Android project has been created, open the styles.xml resource file in the /app/src/main/res/values directory and update the parent attribute on the style element to value “” to remove the Action Bar from the Activity. Select the “Blank Activity” project template and provide a project name, set the package name then select “Finish” to create the Android project. Open Android Studio and follow the wizard for creating a new Android project. We will start this tutorial for building a BMI calculator by creating a brand new project in Android Studio. See the sample screenshots below for the Android app we will build. We will support both the metric unit system and the imperial unit system for calculating the BMI which allows the user to enter weight in either kilograms or pounds and the height in centimeters or feet and inches. In this tutorial, we will be creating an Android app that calculates Body Mass Index (BMI) based height and weight entered by the user.

Creating a BMI Calculator Android App Tutorial

#Create a body mass index calculator javascript code#

Displays the calculated BMI and categorization of the BMI inside a CardView widgetĪll of the code samples shared in this post are available in GitHub.Uses a ToggleButton to support calculation of BMI with both the metric and imperial measurement systems.Contains a class that uses the Singleton Pattern and contains the calculation logic for BMI.Captures weight and height with EditText widgets.

#Create a body mass index calculator javascript for android#

In this tutorial, we will build a BMI calculator app for Android that:

#Create a body mass index calculator javascript how to#

As a part of the series for creating apps from scratch, I have put together a tutorial on how to build a BMI calculator app for Android.