android - Set layout_anchor at runtime on FloatingActionButton -

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i trying animate android.support.design.widget.floatingactionbutton pinned appbarlayout. can set fine within layout xml , shows fine. doing shared element transition layout , fab showing before view set. tried set visibility gone , invisible seem disregarded if layout_anchor set in layout xml. there anyway around this?

i activity load shared element transition fade in fab. can't hide fab on load. without using layout_anchor prefer keep if possible.

if have fab the app:layout_anchor attribute, , want set visibility should use this:

coordinatorlayout.layoutparams params = (coordinatorlayout.layoutparams) fab.getlayoutparams(); params.setanchorid(view.no_id); fab.setlayoutparams(params); fab.setvisibility(view.gone);

if want set theapp:layout_anchor dinamically can use same code:

coordinatorlayout.layoutparams p = (coordinatorlayout.layoutparams) fab.getlayoutparams(); p.setanchorid(xxxx); fab.setlayoutparams(p);

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