Quote:
java.lang.NumberFormatException: For input string: ""
The error is pretty clear. An empty string cannot be converted to a numerical value.
You're next question is going to be "how do I fix it?" Well, that depends. Assuming this is line 72:
int temp=Integer.parseInt(text);
It appears you're not validating the text you retrieved from line 71 actually returned anything useful. Either there's no text in "textField" or your business rules allowed that to happen when they should not have. How you fix that depends on how you want the app to act with bad data at that point in the code.