updating Hidden Icons activity style

Author: tibbi

app/src/main/kotlin/com/simplemobiletools/launcher/activities/HiddenIconsActivity.kt

@@ -19,10 +19,14 @@ import kotlinx.android.synthetic.main.activity_hidden_icons.*
 
 class HiddenIconsActivity : SimpleActivity(), RefreshRecyclerViewListener {
     override fun onCreate(savedInstanceState: Bundle?) {
+        isMaterialActivity = true
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_hidden_icons)
         updateIcons()
 
+        updateMaterialActivityViews(manage_hidden_icons_coordinator, manage_hidden_icons_list, useTransparentNavigation = true, useTopSearchMenu = false)
+        setupMaterialScrollListener(manage_hidden_icons_list, manage_hidden_icons_toolbar)
+
         val layoutManager = manage_hidden_icons_list.layoutManager as MyGridLayoutManager
         layoutManager.spanCount = getColumnCount()
     }

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

@@ -5,26 +5,19 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <com.google.android.material.appbar.AppBarLayout
-        android:id="@+id/manage_hidden_icons_app_bar_layout"
+    <com.google.android.material.appbar.MaterialToolbar
+        android:id="@+id/manage_hidden_icons_toolbar"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content">
-
-        <com.google.android.material.appbar.MaterialToolbar
-            android:id="@+id/manage_hidden_icons_toolbar"
-            android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
-            android:background="@color/color_primary"
-            app:title="@string/hidden_icons"
-            app:titleTextAppearance="@style/AppTheme.ActionBar.TitleTextStyle" />
-
-    </com.google.android.material.appbar.AppBarLayout>
+        android:layout_height="?attr/actionBarSize"
+        android:background="@color/color_primary"
+        app:title="@string/hidden_icons"
+        app:titleTextAppearance="@style/AppTheme.ActionBar.TitleTextStyle" />
 
     <RelativeLayout
         android:id="@+id/manage_hidden_icons_wrapper"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        app:layout_behavior="@string/appbar_scrolling_view_behavior">
+        android:layout_marginTop="?attr/actionBarSize">
 
         <com.simplemobiletools.commons.views.MyRecyclerView
             android:id="@+id/manage_hidden_icons_list"