Question

I’ve made an offline currency convertor that gets the users input in the EditText section using a TextWatcher and returns the required ouptut from methods…and I”ve made it an a way that the user cannot insert a “null” value in the EditText section and then press the convert button by using euro.getText !==null for example.But I don’t know how to proceed when the user leaves some space between the input,for instance 29 50.This will make my program to crash.My question what should I use to check for an input with space in order to avoid a program crash?Thank you.

Answer 1

Your program crashes with number format exception. You can do so:

try{
    double value = Double.parseDouble(editText.getText().toString());
} catch(NumberFormatException ex){
    Log.e(TAG, "improper number format");
    //show some dialog saying what's the format that should be entered
}

You can also go with a regex:

String editTextValue = editText.getText().toString();
if(editTextValue.matches("\\d+\\.\\d+")){
    double value = Double.parseDouble(editTextValue);
} else{
    //show dialog saying what should be the format.
}