Simple Calculator Project (Android App)

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#1

This https://www.codecademy.com/paths/introduction-to-android-with-java/tracks/developing-an-android-application/modules/building-android-apps/informationals/simple-calculator-project

project asks to

Ensuring the app doesn’t crash when the equals button is pressed and one of the number boxes is empty.

  • When equals is pressed, before you do anything, ensure that the number boxes aren’t empty so an error doesn’t throw.

How to check whether is it something in number boxes?

#2

Hi, and welcome to the forums :slight_smile:

If this is how you get the value from the numberBox:

numberBox.getText().toString()

…then you’d just need to check whether that equals "" (an empty String) or not.
Something like this:

if(numberBox.getText().toString() == ""){
    // do something
}else{
    // do something else
}

Hope this helped :slight_smile:

1 Like
#3

I had to use

numberBox.getText().toString().isEmpty()