Question

I am making an android application where i got a set of strings that i load from SharedPreferences so that i can save the strings. The strings contain only numbers, but it is not an int value, its a string value. And i wounder how i can minus the numbers that’s in there, becuase usually, i would have been using something like an int value = value – value; But that doesn’t seem to work since it’s a string and not an int value. How can i do this even though it’s a string? I know i could use int values instead, but as i didn’t think of this before now, when i’m almost done, it would be alot of work changing all of the code that’s related to this. Please help me and thanks so much in advance!

Answer 1

You will have to convert your strings to ints first, then operate on them, then save the string back:

String value = preferences.getString("key:");
int intValue = Integer.valueOf(value);

intValue = intValue - 1;

preferences.edit().putString("key", Integer.toString(intValue)).commit();