Change Collapsing toolbar menu icons color on scroll

Question

How to create Toolbar like Google trips application Trip Screen [Please check the image in the below link]. https://i.sstatic.net/kZVnC.jpg ,

Before scroll toolbar menu icons will be in white colour. After scroll toolbar is collapsed menu icons will be changed to grey colour.

Answer 1

To change toolbar icons color on scroll, I used ToolbarColorizeHelper .[https://gist.github.com/chomi3/7e088760ef7bca10430e][1]

i added the addOnOffsetChangedListener to collapsing toolbar to observe the toolbar scroll offset. Below is the code I used to achieve the expected UI attached in the above question.

addOnOffsetChangedListener((appBarLayout, verticalOffset) -> { //Check if the view is collapsed

       if (scrollOffset <= toolbar.getHeight()) {
                ToolBarColourizer.colorizeToolbar(toolbar, Color.BLACK);             
        } else {
                ToolBarColourizer.colorizeToolbar(toolbar, Color.WHITE);
            }
        }
    });