NodeItemsRecyclerAdapter.java

@ColorInt
    private int getColorForNode(Node node) {
        //Set the color of the node item.
        if(node.getEdges().getIn().length <= 1 && node.getEdges().getOut().length <= 1) {
            //This is either a green process or a yes/no question answer.
            //we need to check the previous node to see what we are.
            Node[] previousNodes = mAlgorithmGraph.getPreviousNodes(node);
            if(previousNodes.length == 0) {
                //this is the first node, so it has to be a process at this point.
                return 0x8BCCA5;
            } if(previousNodes.length == 1) {
                //there is one parent node to this one, so we check how many outer links it has.
                int numberOfOutEdges = previousNodes[0].getEdges().getOut().length;
                if(numberOfOutEdges > 1) {
                    //the previous node is a question, so this needs to be purple.
                    return 0xE1BEE7;
                }
                return 0x8BCCA5;
            }
            return 0x8BCCA5;
        } else if (node.getEdges().getOut().length > 1) {
            //Question node.
            return 0x82B1FF;
        } else if(node.getEdges().getOut().length == 0) {
            //final node.
            return 0xFF8A80;
        }
        throw new IllegalStateException("The provided node doesn't " +
                "have a possible color and should be checked. " +
                "Node ID:" + node.getId());
    }