Question

My app has a number of numeric user input fields which need sanity checks before proceeding to the next intent.
I read viewText fields, convert them to double and then do the (numeric) tests but odd things happen and I find that while the code runs on my HTC in debug, it falls over if I publish then download the published version. My code is sumarised as;

    String sFy;
    double  mFy=0;D
    sFy=(txtFy.getText().toString());
    mFy=Double.parseDouble(sFy);  

if sFy is null the .parsedouble crashes. If I use;

    sFy=(txtFy.getText().toString());
    mFy=getDouble(sFy); 

    private double getDouble(String string){
    double temp=0.0;
    try {
        temp = Double.parseDouble(string.trim());
    } catch(NumberFormatException nfe) {
       System.out.println("getDouble, Could not parse " + nfe);
    }         
    return temp;        
} 

it works, even if sFy is empty.

Can anyone tell my why, or suggest a ‘correct’ method?

Answer 1

Maybe like that :

String sFy;
double  mFy=0;
sFy = txtFy.getText();
if ((sFy != ""){
    mFy=Double.parseDouble(sFy);  
}

Or maybe I haven’t really understood your problem…