Bug 5562 - When deriving from FrameLayout, overriding RequestLayout method throws fatal exception
Summary: When deriving from FrameLayout, overriding RequestLayout method throws fatal ...
Alias: None
Product: Android
Classification: Xamarin
Component: General ()
Version: 4.2.x
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: ---
Assignee: Jonathan Pryor
Depends on:
Reported: 2012-06-06 23:35 UTC by David
Modified: 2016-09-02 20:05 UTC (History)
5 users (show)

Tags: XATriaged
Is this bug a regression?: ---
Last known good build:

A class which derives from FrameLayout (711 bytes, application/octet-stream)
2012-06-06 23:35 UTC, David

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Description David 2012-06-06 23:35:19 UTC
Created attachment 2027 [details]
A class which derives from FrameLayout

I have included as an attachment a class which derives from FrameLayout.

When I use this class in my AXML (Main.axml), it causes a fatal exception to be thrown.

The text of the exception follows:

System.NotSupportedException: Unable to activate instance of type DataFlow.MyTestLayout from native handle 44e8c540 ---> System.Exception: No constructor found for DataFlow.MyTestLayout::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership)
  at Java.Interop.TypeManager.CreateProxy (System.Type type, IntPtr handle, JniHandleOwnership transfer) [0x00033] in /Users/builder/data/lanes/monodroid-mac-4.2-series/bb1beee2/source/monodroid/src/Mono.Android/src/Java.Interop/TypeManager.cs:241
  at Java.Interop.TypeManager.CreateInstance (IntPtr handle, JniHandleOwnership transfer, System.Type targetType) [0x001c2] in /Users/builder/data/lanes/monodroid-mac-4.2-series/bb1beee2/source/monodroid/src/Mono.Android/src/Java.Interop/TypeManager.cs:226
  --- End of inner exception stack trace ---
  at Java.Interop.TypeManager.CreateInstance (intptr,Android.Runtime.JniHandleOwnership,System.Type) [0x001df] in /Users/builder/data/lanes/monodroid-mac-4.2-series/bb1beee2/source/monodroid/src/Mono.Android/src/Java.Interop/TypeManager.cs:229
  at Java.Lang.Object.GetObject (intptr,Android.Runtime.JniHandleOwnership,System.Type) [0x000a5] in /Users/builder/data/lanes/monodroid-mac-4.2-series/bb1beee2/source/monodroid/src/Mono.Android/src/Java.Lang/Object.cs:226
  at Java.Lang.Object._GetObject<Android.Views.View> (intptr,Android.Runtime.JniHandleOwnership) <0x00127>
  at Java.Lang.Object.GetObject<Android.Views.View> (intptr,Android.Runtime.JniHandleOwnership) <0x00073>
  at Android.Views.View.n_RequestLayout (intptr,intptr) [0x00000] in /Users/builder/data/lanes/monodroid-mac-4.2-series/bb1beee2/source/monodroid/src/Mono.Android/platforms/android-8/src/generated/Android.Views.View.cs:8106
  at (wrapper dynamic-method) object.1da015ad-e6f8-40b5-9530-3ff133dd1158 (intptr,intptr) <IL 0x0000c, 0x0002b>

I am using MonoDevelop 3.0.1 and Mono for Android:
Comment 1 Jonathan Pobst 2012-06-07 00:43:53 UTC
Try creating the constructor it's asking for, and have it simply call it's base:

public MyTestLayout (IntPtr javaReference, Android.Runtime.JniHandleOwnership transfer) : base (javaReference, transfer)