ScrollAwareFABBehavior temporary fix.

app/src/main/java/gr/thmmy/mthmmy/utils/ScrollAwareFABBehavior.java

@@ -3,6 +3,7 @@ package gr.thmmy.mthmmy.utils;
 import android.content.Context;
 import android.support.design.widget.CoordinatorLayout;
 import android.support.design.widget.FloatingActionButton;
+import android.support.v4.view.ViewCompat;
 import android.util.AttributeSet;
 import android.view.View;
 
@@ -14,7 +15,7 @@ public class ScrollAwareFABBehavior extends CoordinatorLayout.Behavior<FloatingA
     @Override
     public boolean onStartNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
                                        final View directTargetChild, final View target, final int nestedScrollAxes) {
-        return true;
+        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
     }
 
     @Override
@@ -24,7 +25,13 @@ public class ScrollAwareFABBehavior extends CoordinatorLayout.Behavior<FloatingA
                                final int dxUnconsumed, final int dyUnconsumed) {
         super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed,dxUnconsumed, dyUnconsumed);
         if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {
-            child.hide();
+            child.hide(new FloatingActionButton.OnVisibilityChangedListener() {
+                @Override
+                public void onHidden(FloatingActionButton fab) {
+                    super.onHidden(fab);
+                    fab.setVisibility(View.INVISIBLE);
+                }
+            });
         } else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
             child.show();
         }

app/src/main/res/layout/activity_topic.xml

@@ -21,7 +21,6 @@
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
             android:background="?attr/colorPrimary"
-            android:transitionName="toolbar"
             app:popupTheme="@style/ToolbarTheme">
         </android.support.v7.widget.Toolbar>
     </android.support.design.widget.AppBarLayout>
@@ -44,7 +43,6 @@
         android:layout_height="50dp"
         android:layout_gravity="bottom|end"
         android:layout_marginTop="-2dp"
-        android:transitionName="bottom_navigation_bar"
         app:elevation="8dp">
 
         <ImageButton
@@ -110,7 +108,9 @@
         android:layout_gravity="bottom|end"
         android:layout_marginBottom="54dp"
         android:layout_marginEnd="@dimen/fab_margins"
-        android:transitionName="fab"
+        app:borderWidth="0dp"
+        app:layout_anchor="@id/topic_recycler_view"
+        app:layout_anchorGravity="bottom|right|end"
         app:layout_behavior="gr.thmmy.mthmmy.utils.ScrollAwareFABBehavior"
         app:srcCompat="@drawable/ic_add_fab"/>
 </android.support.design.widget.CoordinatorLayout>