sharedPref.getInt: java.lang.String cannot be cast to java.lang.Integer

Question

I have a preferences.xml which contains the following definition:

Answer 1

First let's have a look at SharedPreferences.getInt() method.

public abstract int getInt (String key, int defValue)

• Added in API level 1
• Retrieve an int value from the preferences.

Parameters

1. key : The name of the preference to retrieve.
2. defValue : Value to return if this preference does not exist.

Returns : Returns the preference value if it exists, or defValue. Throws ClassCastException if there is a preference with this name that is not an int.

So in your case, all the entry values have been defined as a string array. Therefore the class cast exception will be thrown.

You can simply solve this problem by modifying your code as follows.

SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
int offsetProgressInitial = Integer.parseInt(sharedPref.getString("limitSetting", "10"));

Answer 2

If you look at what getInt() does internally you will see the problem:

Integer v = (Integer)mMap.get(key);

Your key "limitSetting" is returning a String which cannot be cast to an Integer.

You can parse it yourself however:

int offsetProgressInitial = Integer.parseInt(sharedPref.getString("limitSetting", "10"));

Answer 3

The problem is that if putInt was never called then getInt will return a null value, even if you set a default integer value.

This seems to be a bug that was never fixed. So the solution is to call the putInt before calling getInt.