Hide FAB onScrollView

[douglasscriptore]

Hello ! How do I hide FAB to scroll the page ?

Thank you

[vbaidak]

Hi,

Call hide() method in your scroll listener.

To show it again, call show() method.

Best wishes, Shell Software Inc. On 8 May 2015 19:00, "Douglas Scriptore" notifications@github.com wrote:

Hello ! How do I hide FAB to scroll the page ?

Thank you

— Reply to this email directly or view it on GitHub https://github.com/shell-software/fab/issues/24.

[douglasscriptore]

I'm using RecyclerView used the setOnScrollLister if anyone has doubts below is the code I used .

 @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            float y = recyclerView.getY();
            if(dy == 0){
                fab.show();
            }else if (y > dy) {
                fab.show();
            }else{
                fab.hide();
            }
        }
    });

[vbaidak]

I'm not sure whether this should work correctly.

getY() is actually an inherited method from android.view.View class, which returns the visual position of the RecyclerView.

In order to get this work, I suggest:

1. Define some limit scroll value (you may use constant for this)
2. Calculate the absolute Y-axis scroll change value
3. If this absolute Y-axis scroll change value >= limit scroll value --> show or hide the ActionButton

The sample code may look like this:

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        int scrollLimit = 4 // convert this value to density-dependent pixel
        boolean scrollLimitReached = Math.abs(dy) >= scrollLimit;
        if (scrollLimitReached) {
            boolean scrollUp = dy >= 0;
            if (scrollUp) {
                actionButton.show();
            } else {
                actionButton.hide();
            }
        }
    }

Hope this helps. Good luck

[douglasscriptore]

wow great, thanks.

[vbaidak]

Issue solved