java.lang.NumberFormatException: Invalid int: “” : Error

Question

I am doing some calculation but unable to parse a string into int or even in float.I searched for solution and i read it somewhere there must be a empty string but i checked my

Answer 1

put these lines inside onClick()

final  String height = e1.getText().toString();
final int a = Integer.parseInt(height);

You are fetching value of e1 in onCreate(), while you want it when user click on button

Also need to check whether height is having any value or not, check Stuluske's answer for this