Use CoordinatorLayout in fragment_event

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

@@ -2,29 +2,33 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/container_event"
+    android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="app.insti.fragment.EventFragment">
+    tools:context="app.insti.fragment.EventFragment"
+    android:background="@android:color/transparent">
 
-    <RelativeLayout
+    <android.support.design.widget.CoordinatorLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
-        <LinearLayout
+        <android.support.design.widget.AppBarLayout
             android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:orientation="vertical">
+            android:layout_height="wrap_content"
+            android:background="@android:color/transparent">
 
-            <android.support.v4.widget.NestedScrollView
-                android:id="@+id/event_scrollview"
+            <android.support.design.widget.CollapsingToolbarLayout
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content">
+                android:layout_height="match_parent"
+                app:layout_scrollFlags="scroll|exitUntilCollapsed">
 
-                <LinearLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="0dp"
-                    android:layout_weight="1"
-                    android:orientation="vertical">
+                <!-- HEADER -->
+                <RelativeLayout
+                    android:layout_height="wrap_content"
+                    android:layout_width="wrap_content"
+                    app:layout_collapseMode="parallax">
 
                     <ImageView
                         android:id="@+id/event_picture_2"
@@ -34,6 +38,22 @@
                         android:scaleType="centerCrop"
                         android:transitionName="sharedAvatar" />
 
+                </RelativeLayout>
+            </android.support.design.widget.CollapsingToolbarLayout>
+        </android.support.design.widget.AppBarLayout>
+
+        <android.support.v4.widget.NestedScrollView
+            android:id="@+id/event_scrollview"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="0dp"
+                android:layout_weight="1"
+                android:orientation="vertical">
+
                 <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
@@ -124,7 +144,6 @@
                         </LinearLayout>
                     </android.support.v7.widget.CardView>
 
-
                     <LinearLayout
                         style="?android:attr/buttonBarStyle"
                         android:layout_width="match_parent"
@@ -192,22 +211,18 @@
                 </LinearLayout>
             </LinearLayout>
         </android.support.v4.widget.NestedScrollView>
-
-        </LinearLayout>
+    </android.support.design.widget.CoordinatorLayout>
 
     <android.support.design.widget.FloatingActionButton
         android:id="@+id/edit_fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-            android:layout_alignParentBottom="true"
-            android:layout_alignParentRight="true"
+        android:layout_gravity="end|bottom"
         android:layout_margin="16dp"
         android:src="@drawable/ic_edit_black_24dp"
         android:tint="@android:color/black"
         android:visibility="invisible" />
 
-    </RelativeLayout>
-
     <app.insti.TouchImageView
         android:id="@+id/expanded_image_event"
         android:layout_width="match_parent"