Making queue drawer trully slide by overriding touch listeners.

MusicApp/MainActivity.cs

@@ -756,7 +756,7 @@ namespace MusicApp
         }
 
         public void ShowSmallPlayer()
-        {            
+        {
             FindViewById<NestedScrollView>(Resource.Id.playerSheet).Visibility = ViewStates.Visible;
             FindViewById(Resource.Id.playerContainer).Alpha = 0;
             FindViewById(Resource.Id.smallPlayer).Alpha = 1;

MusicApp/MusicApp.csproj

@@ -340,6 +340,7 @@
     <Compile Include="Resources\Portable Class\DownloadQueue.cs" />
     <Compile Include="Resources\Portable Class\DownloadQueueAdapter.cs" />
     <Compile Include="Resources\Portable Class\FixedLinearLayoutManager.cs" />
+    <Compile Include="Resources\Portable Class\FixedNestedScrollView.cs" />
     <Compile Include="Resources\Portable Class\PlayerBehavior.cs" />
     <Compile Include="Resources\Portable Class\PlaylistHolder.cs" />
     <Compile Include="Resources\Portable Class\PlaylistLocationAdapter.cs" />

MusicApp/Resources/Portable Class/FixedNestedScrollView.cs

@@ -0,0 +1,48 @@
+using Android.Content;
+using Android.Runtime;
+using Android.Support.V4.Widget;
+using Android.Util;
+using Android.Views;
+using System;
+
+[Register("MusicApp/FixedNestedScrollView")]
+public class FixedNestedScrollView : NestedScrollView
+{
+    public static bool PreventSlide = false;
+
+    public FixedNestedScrollView(Context context) : base(context) { }
+    public FixedNestedScrollView(Context context, IAttributeSet attrs) : base(context, attrs) { }
+    public FixedNestedScrollView(Context context, IAttributeSet attrs, int defStyleAttr) : base(context, attrs, defStyleAttr) { }
+    protected FixedNestedScrollView(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer) { }
+
+    ////Overriden because DrawerLayout need to be measured with MeasureSpecMode EXACLTY
+    //protected override void MeasureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed)
+    //{
+    //    //if (child is DrawerLayout)
+    //    //{
+    //        MarginLayoutParams lp = (MarginLayoutParams)child.LayoutParameters;
+    //        int childWidthMeasureSpec = GetChildMeasureSpec(parentWidthMeasureSpec, PaddingLeft + PaddingRight + lp.LeftMargin + lp.RightMargin + widthUsed, lp.Width);
+    //        int childHeightMeasureSpec = MeasureSpec.MakeMeasureSpec(parentWidthMeasureSpec, MeasureSpecMode.Exactly);
+    //        child.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
+    //    Console.WriteLine("&Height: " + child.MeasuredHeight + " Child: " + child);
+    //    //}
+    //    //else
+    //    //    base.MeasureChildWithMargins(child, parentWidthMeasureSpec, widthUsed, parentWidthMeasureSpec, heightUsed);
+    //}
+
+    public override bool OnInterceptTouchEvent(MotionEvent ev)
+    {
+        if(PreventSlide)
+            return false;
+
+        return base.OnInterceptTouchEvent(ev);
+    }
+
+    public override bool OnTouchEvent(MotionEvent e)
+    {
+        if(PreventSlide)
+            return false;
+
+        return base.OnTouchEvent(e);
+    }
+}

MusicApp/Resources/Portable Class/Player.cs

@@ -11,7 +11,6 @@ using Android.Runtime;
 using Android.Support.Design.Widget;
 using Android.Support.V4.Widget;
 using Android.Support.V7.Graphics;
-using Android.Support.V7.Widget;
 using Android.Text;
 using Android.Text.Style;
 using Android.Util;
@@ -41,7 +40,7 @@ namespace MusicApp
         private ProgressBar spBar;
         private TextView timer;
         private ImageView view;
-        private DrawerLayout DrawerLayout;
+        public DrawerLayout DrawerLayout;
         private bool prepared = false;
         private readonly int[] timers = new int[] { 0, 2, 10, 30, 60, 120 };
         private int checkedItem = 0;
@@ -179,7 +178,7 @@ namespace MusicApp
             view.SetImageBitmap(drawable);
             Palette.From(drawable).MaximumColorCount(28).Generate(this);
 
-            if(view.Width > 0)
+            if (view.Width > 0)
             {
                 //The width of the view in pixel (we'll multiply this by 0.75f because the drawer has a width of 75%)
                 int width = (int)(view.Width * (float)drawable.Height / view.Height);
@@ -746,7 +745,10 @@ namespace MusicApp
 
         public void OnDrawerStateChanged(int newState)
         {
-
+            if (newState == DrawerLayout.StateDragging)
+                FixedNestedScrollView.PreventSlide = true;
+            else if(newState == DrawerLayout.StateSettling)
+                FixedNestedScrollView.PreventSlide = false;
         }
     }
 }

MusicApp/Resources/Portable Class/PlayerBehavior.cs

@@ -40,14 +40,6 @@ public class PlayerBehavior : BottomSheetBehavior
         return base.OnStartNestedScroll(coordinatorLayout, child, directTargetChild, target, axes, type);
     }
 
-    public override bool OnNestedPreFling(CoordinatorLayout coordinatorLayout, Java.Lang.Object child, View target, float velocityX, float velocityY)
-    {
-        if (PreventSlide)
-            return false;
-
-        return base.OnNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY);
-    }
-
     public override void OnNestedPreScroll(CoordinatorLayout coordinatorLayout, Java.Lang.Object child, View target, int dx, int dy, int[] consumed, int type)
     {
         if (PreventSlide)
@@ -63,4 +55,12 @@ public class PlayerBehavior : BottomSheetBehavior
 
         base.OnStopNestedScroll(coordinatorLayout, child, target, type);
     }
+
+    public override bool OnNestedPreFling(CoordinatorLayout coordinatorLayout, Java.Lang.Object child, View target, float velocityX, float velocityY)
+    {
+        if (PreventSlide)
+            return false;
+
+        return base.OnNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY);
+    }
 }

MusicApp/Resources/layout/Main.xml

@@ -4,7 +4,7 @@
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
-  android:layout_height="fill_parent"
+  android:layout_height="match_parent"
   android:fitsSystemWindows="true" >
   <android.support.design.widget.CoordinatorLayout 
     android:layout_width="match_parent"
@@ -82,11 +82,11 @@
     app:itemTextColor="@color/color_tint"
     app:menu="@menu/bottom_items" />
 
-  <android.support.v4.widget.NestedScrollView
+  <MusicApp.FixedNestedScrollView
     android:id="@+id/playerSheet"
     android:fitsSystemWindows="true"
-    android:layout_width="wrap_content"
-    android:layout_height="fill_parent"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
     android:visibility="gone"
     android:elevation="6dp"
     android:translationY="-56dp"
@@ -94,8 +94,8 @@
     app:behavior_peekHeight="70dp"
     app:layout_behavior="MusicApp.PlayerBehavior" >
     <RelativeLayout
-      android:layout_width="fill_parent"
-      android:layout_height="fill_parent"
+      android:layout_width="match_parent"
+      android:layout_height="match_parent"
       android:id="@+id/playersHolder"
       android:background="#2b5568"
       android:fitsSystemWindows="true" >
@@ -198,10 +198,10 @@
       <fragment
         android:name="MusicApp.Player"
         android:id="@+id/playerContainer"
-        android:layout_width="fill_parent"
-        android:layout_height="fill_parent" />
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
     </RelativeLayout>
-  </android.support.v4.widget.NestedScrollView>
+  </MusicApp.FixedNestedScrollView>
     
   <android.support.design.widget.CoordinatorLayout
     android:id="@+id/snackBar"