android - FloatingActionButton doesn't hide -
i trying hide floatingactionbutton fablocation programmatically :
fablocation.setvisibility(view.gone) but not work.
if add android:visibility="gone" in xml layout, fablocation hidden when run activity reappears when scroll.
here layout:
<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.coordinatorlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/main_content" android:layout_width="match_parent" android:layout_height="match_parent" android:fitssystemwindows="true"> <android.support.design.widget.appbarlayout android:id="@+id/appbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:fitssystemwindows="true" android:theme="@style/themeoverlay.appcompat.dark.actionbar"> <android.support.design.widget.collapsingtoolbarlayout android:id="@+id/collapsing_toolbar" android:layout_width="match_parent" android:layout_height="match_parent" android:fitssystemwindows="true" app:contentscrim="@color/coloroverlay" app:expandedtitlemarginend="64dp" app:expandedtitlemarginstart="48dp" app:layout_scrollflags="scroll|exituntilcollapsed"> <imageview android:id="@+id/img_couverture" android:layout_width="match_parent" android:layout_height="match_parent" android:fitssystemwindows="true" android:scaletype="centercrop" android:src="@drawable/bg_navigation_drawer_header" app:layout_collapsemode="parallax" /> <android.support.v7.widget.toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionbarsize" app:layout_collapsemode="pin" app:popuptheme="@style/themeoverlay.appcompat.light" /> </android.support.design.widget.collapsingtoolbarlayout> </android.support.design.widget.appbarlayout> <android.support.v4.widget.nestedscrollview android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <android.support.v7.widget.cardview android:layout_margintop="8dp" android:layout_width="match_parent" android:layout_height="wrap_content"> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="16dp"> <textview android:id="@+id/tv_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:textsize="18sp" /> <view android:background="@drawable/separator_orange_gradient" android:layout_margintop="8dp" android:layout_marginbottom="16dp" android:layout_width="match_parent" android:layout_height="2dp"/> <textview android:id="@+id/tv_history" android:layout_width="match_parent" android:layout_height="wrap_content" android:textappearance="@style/textappearance.robotolight" /> </linearlayout> </android.support.v7.widget.cardview> </linearlayout> </android.support.v4.widget.nestedscrollview> <android.support.design.widget.floatingactionbutton android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="16dp" android:clickable="true" android:id="@+id/fab_location" android:src="@drawable/ic_fab_location_24dp" app:backgroundtint="@color/colororange" app:layout_anchor="@id/appbar" app:layout_anchorgravity="bottom|right|end" />
it due app:layout_anchor attribute. must rid of anchor before changing visibility:
coordinatorlayout.layoutparams p = (coordinatorlayout.layoutparams) fab.getlayoutparams(); p.setanchorid(view.no_id); fab.setlayoutparams(p); fab.setvisibility(view.gone); 
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