Android: Can't figure how to use setImeActionLabel

What I want to do is change the default "Done" label that appears in the virtual keyboard. Here's what I've tried without any luck:

mSearchInput.setImeOptions(EditorInfo.IME_ACTION_DONE);
mSearchInput.setImeActionLabel(getString(R.string.search_action_label), EditorInfo.IME_ACTION_DONE);

I am able, however, to handle a click on that button, with this:

mSearchInput.setOnEditorActionListener(new TextView.OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        if (actionId == EditorInfo.IME_ACTION_DONE) {
            performSearch();
            return true;
        }
        return false;
    }
});

I'm clueless as to how I can change the label on that button at the moment.