Floatingactionbutton Doesn't Hide

FloatingActionButton doesn't hide

It is due to the app:layout_anchor attribute. You must get rid of the anchor before changing visibility:

CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setAnchorId(View.NO_ID);
fab.setLayoutParams(p);
fab.setVisibility(View.GONE);

I can't hide Floating Action Button?

Use the method hide:

fab.hide();

FloatingActionButton setVisibility() not working

If your issue is the animation, you could try invalidating the FAB Behavior. As for the visibility, you should null the anchor you have set in your layout:

CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setBehavior(null); //should disable default animations
p.setAnchorId(View.NO_ID); //should let you set visibility
fab.setLayoutParams(p);
fab.setVisibility(View.GONE); // View.INVISIBLE might also be worth trying

//to bring things back to normal state
CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setBehavior(new FloatingActionButton.Behavior());
p.setAnchorId(R.id.appbar);
fab.setLayoutParams(p);

How to hide floatingActionButton when endDrawer is open Flutter

I think it's because you have the end drawer in the child Scaffold, so the FloatingActionButton is above the child Scaffold including its endDrawer.

try moving the endDrawer to the parent Scaffold

return Scaffold(
  backgroundColor: Colors.white,
  appBar: AppBar(),
  floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
  floatingActionButton: FloatingActionButton(),
  drawer: Drawer(),
  endDrawer: Drawer(),
  body: Scaffold(
    appBar: AppBar(),
    body: Container(
    ),
  ),
);

or move the FloatingActionButton to the child Scaffold

child: Scaffold(
  backgroundColor: Colors.white,
  appBar: AppBar(),
  drawer: Drawer(),
  body: Scaffold(
    floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
    floatingActionButton: FloatingActionButton(),
    appBar: AppBar(),
    endDrawer: Drawer(),
    body: Container(
    ),
  ),
);

Custom auto hide floatingActionButton behavior is not working

Take a look at what @woxingxiao is saying here

Pretty much onNestedScroll won't get fired if the visibility of the button is GONE. So, replace:

child.hide();

to:

child.hide(new FloatingActionButton.OnVisibilityChangedListener() {
    @Override
    public void onHidden(FloatingActionButton fab) {
        super.onHidden(fab);
        fab.setVisibility(View.INVISIBLE);
    }
});

FloatingActionButton visible for sometime even if visibility is set to gone

        CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams)    fab.getLayoutParams();
        p.setAnchorId(View.NO_ID);
        p.width = 0;
        p.height = 0;
        fab.setLayoutParams(p);
        fab.setVisibility(View.GONE);

Floating Action Button attached with anchor not hiding when scrolling RecyclerView items slow

You have to implement custom behavior for FAB to achieve effect which you want.
I slightly changed original implementation, to get it working without toolbar.

    public class FABBehavior extends FloatingActionButton.Behavior {

    public FABBehavior() {
    }

    public FABBehavior(Context context, AttributeSet attributeSet) {
    }

    public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton child, View dependency) {
        if(dependency instanceof Snackbar.SnackbarLayout) {
           return super.onDependentViewChanged(parent, child, dependency);
        } else if(dependency instanceof AppBarLayout) {
            this.updateFabVisibility(parent, (AppBarLayout)dependency, child);
        }

        return false;
    }

    private boolean updateFabVisibility(CoordinatorLayout parent, AppBarLayout appBarLayout, FloatingActionButton child) {
        CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams)child.getLayoutParams();
        if(lp.getAnchorId() != appBarLayout.getId()) {
            return false;
        } else {

            ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) child.getLayoutParams();
            int point = child.getTop() - params.topMargin;
            try {
                Method method = AppBarLayout.class.getDeclaredMethod("getMinimumHeightForVisibleOverlappingContent");
                method.setAccessible(true);
                if(point <= (int) method.invoke(appBarLayout)) {
                    child.hide();
                } else {
                    child.show();
                }
                return true;
            } catch (Exception e) {
                return true;
            }
        }
    }
}

You may apply this behavior using app:layout_behavior of course.

F.A.B Hides but Doesn't Show

Which support library version are you using in your project?

If you are using the latest one ( I mean 25.0.x), this is because fab.hide() method set the visibility to be View.GONE. This makes nested scroll listener stop to check fab, the second time you try to scroll the list.

More detail can be found here: https://code.google.com/p/android/issues/detail?id=230298

And I search a bit found this similar question already have a nice answer:
Floating action button not visible on scrolling after updating Google Support & Design Library

So a possible work around would be to override fab.hide method, not to set the visibility to GONE but INVISIBLE instead.

And I think this may be fixed from upstream later, so just keep an eye on it.

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