Android Preferences error, "String cannot be cast to int"

Your Preferences in XML, even if you set android:inputType="number" are still stored as a String

You have 2 choices:

1) the 'not-so-nice': Integer.parseInt( preferences.getString("defaultTip", "15"));

2) Using your own type of Integer Preference. More complicated to set in first place but really better (similar question here: https://stackoverflow.com/a/3755608/327402)

The exception can also be thrown if

• you are using the same key for storing two or more different types of values
• at first you stored the value as String and then changed storing and retrieving implementation for int value. For this case just clear the cache.