Add a Default Property binder for Android

ReactiveUI.Platforms/Android/AndroidDefaultPropertyBinding.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Linq;
+using ReactiveUI;
+using Android.Widget;
+
+namespace ReactiveUI.Android
+{
+    /// <summary>
+    /// Default property bindings for common Android widgets
+    /// </summary>
+    public class AndroidDefaultPropertyBinding : IDefaultPropertyBindingProvider
+    {
+        public Tuple<string, int> GetPropertyForControl(object control)
+        {
+            // NB: These are intentionally arranged in priority order from most
+            // specific to least specific.
+            var items = new[] {
+                new { Type = typeof(TextView), Property = "Text" },
+                new { Type = typeof(ImageView), Property = "Drawable" },
+                new { Type = typeof(ProgressBar), Property = "Progress" },
+                new { Type = typeof(CompoundButton), Property = "Checked" },
+            };
+
+            var type = control.GetType();
+            var kvp = items.FirstOrDefault(x => x.Type.IsAssignableFrom(type));
+
+            return kvp != null ? Tuple.Create(kvp.Property, 5) : null;
+        }
+    }
+}

ReactiveUI.Platforms/Cocoa/CocoaDefaultPropertyBinding.cs

@@ -43,6 +43,5 @@ public class CocoaDefaultPropertyBinding : IDefaultPropertyBindingProvider
 
             return kvp != null ? Tuple.Create(kvp.Property, 5) : null;
         }
-
     }
 }

ReactiveUI.Platforms/ReactiveUI.Android.csproj

@@ -74,6 +74,7 @@
     <Compile Include="Android\PlatformOperations.cs" />
     <Compile Include="Android\ReactiveActivity.cs" />
     <Compile Include="Android\ReactiveFragment.cs" />
+    <Compile Include="Android\AndroidDefaultPropertyBinding.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ReactiveUI\ReactiveUI_Monodroid.csproj">

ReactiveUI.Platforms/Registrations.cs

@@ -51,6 +51,10 @@ public void Register(Action<Func<object>, Type> registerFunction)
             registerFunction(() => new AutoDataTemplateBindingHook(), typeof(IPropertyBindingHook));
 #endif
 
+#if ANDROID
+            registerFunction(() => new AndroidDefaultPropertyBinding(), typeof(IDefaultPropertyBindingProvider));
+#endif
+
 #if UIKIT
             registerFunction(() => UIKitObservableForProperty.Instance.Value, typeof(ICreatesObservableForProperty));
             registerFunction(() => UIKitCommandBinders.Instance.Value, typeof(ICreatesCommandBinding));