Why does Kit Kat require the use of the isValidFragment?

Question

Ever since KitKat was released, I\'ve noticed a whole bunch of my apps updating with \"Fixing a crash in Kit Kat\". Recently when I released my own app, I figured out the likely

Answer 1

Taken from a blog of commonsware.

Once you target API Level 19 or higher, you will need to override isValidFragment() in your PreferenceActivity, to validate that the supplied fragment class name is indeed something that should be displayed. Off the cuff, this feels like some hack to deal with a security flaw.

Documentation says

protected boolean isValidFragment (String fragmentName)

Subclasses should override this method and verify that the given fragment is a valid type to be attached to this activity. The default implementation returns true for apps built for android:targetSdkVersion older than KITKAT. For later versions, it will throw an exception.