InstantiationException when using subclass of EditTextPreference

Question

Assume, I have a subclass of EditTextPreference called PasswordProtectedEditTextPreference. This subclass basically shows a password dialog before one can edit

Answer 1

You created an abstract class:

  public abstract class PasswordProtectedEditTextPreference  

No wonder it can't be instantiated ;-)

Answer 2

Usually, that means that you do not have an appropriate constructor. Make sure that your constructor is public and takes a Context and AttributeSet as parameters:

public TimePreference(Context ctxt, AttributeSet attrs)

(from this custom preference from this sample project)