public void setCheckedButtonByIndex(final boolean checked, final int... indexes) {
        for (int idx : indexes) {
            if (idx >= 0 && idx < this.valueButtons.size()) {
                this.valueButtons.get(idx).setChecked(checked);
            }
        }
        checkAndSetAllNone();
    }
adds chips to this group programatically
main/src/main/java/cgeo/geocaching/ui/ChipChoiceGroup.java