[Android] Color.Accent is hardcoded (#270)

1 files changed, 34 insertions, 13 deletions

diff --git a/Xamarin.Forms.Platform.Android/Forms.cs b/Xamarin.Forms.Platform.Android/Forms.cs
index 62e07f22..a2a063c9 100644
--- a/Xamarin.Forms.Platform.Android/Forms.cs
+++ b/Xamarin.Forms.Platform.Android/Forms.cs
@@ -96,19 +96,7 @@ namespace Xamarin.Forms
 
 			ResourceManager.Init(resourceAssembly);
 
-			// Detect if legacy device and use appropriate accent color
-			// Hardcoded because could not get color from the theme drawable
-			var sdkVersion = (int)Build.VERSION.SdkInt;
-			if (sdkVersion <= 10)
-			{
-				// legacy theme button pressed color
-				Color.Accent = Color.FromHex("#fffeaa0c");
-			}
-			else
-			{
-				// Holo dark light blue
-				Color.Accent = Color.FromHex("#ff33b5e5");
-			}
+			Color.Accent = GetAccentColor();
 
 			if (!IsInitialized)
 				Log.Listeners.Add(new DelegateLogListener((c, m) => Trace.WriteLine(m, c)));
@@ -148,6 +136,39 @@ namespace Xamarin.Forms
 			IsInitialized = true;
 		}
 
+		static Color GetAccentColor()
+		{
+			Color rc;
+			using (var value = new TypedValue())
+			{
+				if (Context.Theme.ResolveAttribute(global::Android.Resource.Attribute.ColorAccent, value, true))	// Android 5.0+
+				{
+					rc = Color.FromUint((uint)value.Data);
+				}
+				else if(Context.Theme.ResolveAttribute(Context.Resources.GetIdentifier("colorAccent", "attr", Context.PackageName), value, true))	// < Android 5.0
+				{
+					rc = Color.FromUint((uint)value.Data);
+				}
+				else                    // fallback to old code if nothing works (don't know if that ever happens)
+				{
+					// Detect if legacy device and use appropriate accent color
+					// Hardcoded because could not get color from the theme drawable
+					var sdkVersion = (int)Build.VERSION.SdkInt;
+					if (sdkVersion <= 10)
+					{
+						// legacy theme button pressed color
+						rc = Color.FromHex("#fffeaa0c");
+					}
+					else
+					{
+						// Holo dark light blue
+						rc = Color.FromHex("#ff33b5e5");
+					}
+				}
+			}
+			return rc;
+		}
+
 		class AndroidDeviceInfo : DeviceInfo
 		{
 			readonly IDeviceInfoProvider _formsActivity;