Hide ime switch icon when there are only one IME and no enabled subtypes

        return null;

    }

    // Display IME switcher icon only when all of the followings are true:

    // * There is only one enabled IME on the device.  (Note that the IME should be the system IME)

    // * There are no explicitly enabled (by the user) subtypes of the IME, or the IME doesn't have

    // its subtypes at all

    private boolean needsToShowIMEButton() {

        List<InputMethodInfo> imis = mImm.getInputMethodList();

        final int size = imis.size();

        return size > 1

                || (size == 1 && mImm.getEnabledInputMethodSubtypeList(imis.get(0)).size() > 1);

    }

    private void refreshStatusIcon(boolean keyboardShown) {

        if (!keyboardShown) {

            setVisibility(View.INVISIBLE);

    public void setIMEButtonVisible(IBinder token, boolean visible) {

        mToken = token;

        mKeyboardShown = visible;

        mKeyboardShown = visible ? needsToShowIMEButton() : false;

        refreshStatusIcon(mKeyboardShown);

    }

}