Make the bottom navigation bar going down to let the player open in fullscreen.

MusicApp/MainActivity.cs

@@ -967,7 +967,7 @@ namespace MusicApp
         public void ShowPlayer()
         {
             FindViewById<NestedScrollView>(Resource.Id.playerSheet).SetPadding(0, 0, 0,0);
-            //SheetBehavior.State = BottomSheetBehavior.StateExpanded;
+            SheetBehavior.State = BottomSheetBehavior.StateExpanded;
         }
 
         public void GetStoragePermission()

MusicApp/Resources/Portable Class/Player.cs

@@ -602,13 +602,9 @@ namespace MusicApp.Resources.Portable_Class
 
             if(movement == SheetMovement.Expanding && 0 <= slideOffset && slideOffset <= 1)
             {
-                Console.WriteLine("&Expanding with offset: " + slideOffset);
-
                 sheet.Alpha = 1;
 
                 int defaultPadding = (int)(20 * context.Resources.DisplayMetrics.Density + 0.5f);
-                //((CoordinatorLayout.LayoutParams)layout.LayoutParameters).BottomMargin = (int)((70 * context.Resources.DisplayMetrics.Density + 0.5f) * (1 - slideOffset));
-                //layout.RequestLayout();
                 sheet.SetPadding((int)(defaultPadding * (1 - slideOffset)), 0, (int)(defaultPadding * (1 - slideOffset)), 0);
                 bottomLayer.TranslationY = (int)((56 * context.Resources.DisplayMetrics.Density + 0.5f) * slideOffset);
 
@@ -622,15 +618,12 @@ namespace MusicApp.Resources.Portable_Class
             }
             else if(movement == SheetMovement.Hidding && - 1 <= slideOffset && slideOffset < 0)
             {
-                //((CoordinatorLayout.LayoutParams)layout.LayoutParameters).BottomMargin = (int)((70 * context.Resources.DisplayMetrics.Density + 0.5f) * (1 + slideOffset));
-                //layout.RequestLayout();
                 sheet.Alpha = 1 + slideOffset;
             }
         }
 
         public override void OnStateChanged(View bottomSheet, int newState)
         {
-            Console.WriteLine("&State: " + newState);
             if (newState == BottomSheetBehavior.StateExpanded)
                 movement = SheetMovement.Unknow;
             else if (newState == BottomSheetBehavior.StateCollapsed)

MusicApp/Resources/layout/Main.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
+<android.support.design.widget.CoordinatorLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
@@ -29,7 +29,9 @@
   <android.support.design.widget.CoordinatorLayout
     android:layout_width="match_parent"
     android:layout_height="fill_parent"
-    layout_constraintEnd_toStartOf="@id/bottomLayer" >
+    app:layout_anchor="@id/bottomLayer"
+    app:layout_anchorGravity="top"
+    android:layout_gravity="top" >
     <android.support.design.widget.AppBarLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
@@ -198,4 +200,4 @@
     </android.support.design.widget.CoordinatorLayout>
 
   </android.support.design.widget.CoordinatorLayout>
-</android.support.constraint.ConstraintLayout>
+</android.support.design.widget.CoordinatorLayout>