Fix android tests (#13874)

* check when using new APIs
* add the view to the hierarchy to make sure everything is complete

src/Core/src/Platform/Android/ContextExtensions.cs

@@ -12,6 +12,7 @@ using AFragmentManager = AndroidX.Fragment.App.FragmentManager;
 using Size = Microsoft.Maui.Size;
 using AColor = Android.Graphics.Color;
 using AAttribute = Android.Resource.Attribute;
+using Android.OS;
 
 namespace Microsoft.Maui
 {
@@ -112,17 +113,21 @@ namespace Microsoft.Maui
 			{
 				if (context.Theme?.ResolveAttribute(attr, mTypedValue, true) == true)
 				{
-					if (mTypedValue.Type >= DataType.FirstInt
-							&& mTypedValue.Type <= DataType.LastInt)
+					if (mTypedValue.Type >= DataType.FirstInt && mTypedValue.Type <= DataType.LastInt)
 					{
 						return mTypedValue.Data;
 					}
 					else if (mTypedValue.Type == DataType.String)
 					{
-						if (context.Resources == null)
-							return 0;
-
-						return context.Resources.GetColor(mTypedValue.ResourceId, context.Theme);
+						if (context.Resources != null)
+						{
+							if (Build.VERSION.SdkInt >= BuildVersionCodes.M)
+								return context.Resources.GetColor(mTypedValue.ResourceId, context.Theme);
+							else
+#pragma warning disable CS0618 // Type or member is obsolete
+								return context.Resources.GetColor(mTypedValue.ResourceId);
+#pragma warning restore CS0618 // Type or member is obsolete
+						}
 					}
 				}
 			}

src/Core/tests/DeviceTests/AssertionExtensions.Android.cs

@@ -57,11 +57,19 @@ namespace Microsoft.Maui.DeviceTests
 			layout.AddView(view);
 			layout.Measure(500, 500);
 			layout.Layout(0, 0, 500, 500);
+
+			var act = view.Context.GetActivity();
+			var rootView = act.FindViewById<FrameLayout>(Android.Resource.Id.Content);
+
+			rootView.AddView(layout);
+
 			var bitmap = Bitmap.CreateBitmap(view.Width, view.Height, Bitmap.Config.Argb8888);
 			Canvas canvas = new Canvas(bitmap);
 			view.Layout(0, 0, view.Width, view.Height);
 			view.Draw(canvas);
 
+			rootView.RemoveView(layout);
+
 			return bitmap;
 		}