[android] How to remove focus without setting focus to another control?

Using clearFocus() didn't seem to be working for me either as you found (saw in comments to another answer), but what worked for me in the end was adding:

<LinearLayout 
    android:id="@+id/my_layout" 
    android:focusable="true" 
    android:focusableInTouchMode="true" ...>

to my very top level Layout View (a linear layout). To remove focus from all Buttons/EditTexts etc, you can then just do

LinearLayout myLayout = (LinearLayout) activity.findViewById(R.id.my_layout);
myLayout.requestFocus();

Requesting focus did nothing unless I set the view to be focusable.