Weird exception: Cannot cast String to Boolean when using getBoolean

Question

I'm getting a very weird error. I have 2 activities. On both I'm getting the SharedPreferences using MODE_PRIVATE (if it matters) by sp = getPreferences(MODE_PRIVATE); on each activity's onCreate() I'm calling sp.getBoolean(IntroActivity.SHOW_INTRO, true)

On the IntroActivity this works fine. But when I'm trying in the main activity, I'm getting this

10-12 04:55:23.208: E/AndroidRuntime(11668): FATAL EXCEPTION: main
10-12 04:55:23.208: E/AndroidRuntime(11668): java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.app.SharedPreferencesImpl.getBoolean(SharedPreferencesImpl.java:242)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at com.lablabla.parkme.ParkMeActivity$2.onClick(ParkMeActivity.java:194)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.view.View.performClick(View.java:4084)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.view.View$PerformClick.run(View.java:16966)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.os.Handler.handleCallback(Handler.java:615)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.os.Looper.loop(Looper.java:137)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at android.app.ActivityThread.main(ActivityThread.java:4745)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at java.lang.reflect.Method.invokeNative(Native Method)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at java.lang.reflect.Method.invoke(Method.java:511)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-12 04:55:23.208: E/AndroidRuntime(11668):    at dalvik.system.NativeStart.main(Native Method)

I made sure that I'm not putting a String somewhere in the middle with that same key

Any ideas?

Thanks!

EDIT: some code:

//onCreate()
sp = getPreferences(MODE_PRIVATE);

// other method
boolean showIntro = sp.getBoolean(IntroActivity.SHOW_INTRO, true); // Exception is here
showIntroCheckBox.setChecked(showIntro);

If it matters, the code which throws the exception is inside a button's onClick

Answer 1

If there's ever been a string with that key, even if by accident, it will stay there until you clear the app's data or uninstall. Try uninstalling it to see if it still occurs.