Before honeycomb, dialogs used their own theme, it is now inherited from the parent

Use this function to generate the AlertDialog context so the theming remains constant.

public Context getThemedContext() {
    Context themedContext;

    if (android.os.Build.VERSION.SDK_INT  >= 
        Build.VERSION_CODES.HONEYCOMB) {
        themedContext = this;
    } else {
        themedContext = new ContextThemeWrapper(this, 
        android.R.style.Theme_Dialog);
    }

    return themedContext;
}