Fix bugzilla41209 (#216)

* [Android] Add custom FormsSeekbar to handle invalid pressed states send by other views

* [Controls] Fix sample , error only occurs with transparent background

1 files changed, 52 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.Android/Renderers/FormsSeekBar.cs b/Xamarin.Forms.Platform.Android/Renderers/FormsSeekBar.cs
new file mode 100644
index 00000000..cb58fbd7
--- /dev/null
+++ b/Xamarin.Forms.Platform.Android/Renderers/FormsSeekBar.cs
@@ -0,0 +1,52 @@
+using System;
+using Android.Widget;
+using Android.Content;
+using Android.Views;
+
+
+namespace Xamarin.Forms.Platform.Android
+{
+	internal class FormsSeekBar : SeekBar
+	{
+		public FormsSeekBar(Context context) : base(context)
+		{
+			//this should work, but it doesn't.
+			DuplicateParentStateEnabled = false;
+		}
+
+		public override bool OnTouchEvent(MotionEvent e)
+		{
+			switch (e.Action)
+			{
+				case MotionEventActions.Down:
+					isTouching = true;
+					break;
+				case MotionEventActions.Up:
+					Pressed = false;
+					break;
+			}
+				
+			return base.OnTouchEvent(e);
+		}
+
+		public override bool Pressed
+		{
+			get
+			{
+				return base.Pressed;
+			}
+			set
+			{
+				if (isTouching)
+				{
+					base.Pressed = value;
+					isTouching = value;
+				}
+					
+			}
+		}
+
+		bool isTouching = false;
+	}
+}
+