UiUtil.java

public static void hideKeyboard(Activity context) {
    View currentFocus = context.getCurrentFocus();
    if (currentFocus != null) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm != null) {
            imm.hideSoftInputFromWindow(currentFocus.getWindowToken(), 0);
        }
    }
}