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Created attachment 9151 [details]
The attached sample demonstrates the problem. A ListViews cells render all black after a binding updates.
**Steps to Reproduce:**
1. Run the attached project on an Android emulator. (I used API 19 Nexus 4)
2. Notice the label at the top, "Wait for it...".
3. You can scroll the list at this point and notice all the cells have the correct Cell text in them.
4. After 3 seconds, the label at the top will update to "Boom...".
5. Scroll the list and notice how the cells do not render the Cell text anymore.
After the binding for the Labels Text updates, the cells in the ListView do not render the content anymore.
The cells should all still show "Cell" in the content.
**Build Date & Platform:**
I also tested this with 1.3.0pre4, however it produced another issue. With 1.3.0pre4 the ListView does not scroll past the end of the screen so the cells are never re-drawn so you can't observe this behavior.
Note* In the sample project the ListView has Grid.ColumnSpan="2". Remove this line and the issue in this report GOES AWAY and the Expected Results are shown.
I tried an alternate layout as well with a StackLayout and no Grid and that does not reproduce the issue. It seems related to have the ListView in a Grid with a Grid.ColumnSpan value.
I have checked this issue and with the help of attached sample and steps mentioned in bug description I am able to reproduce this issue.
When I deploy the sample project, everything works fine until the label at the top is not updated to "Boom..." but after 3 seconds when label is updated to "Boom..." and I scroll the list view up or down I observed that the cells in the list view do not render the content. but when I removed the Grid.ColumnSpan="2", I observed that I am not getting this behavior and application is working fine.
=== Xamarin Studio ===
Version 5.7 (build 660)
Installation UUID: 6ea47b0d-1852-4aaf-808d-373ff0a5002b
Mono 3.12.0 ((detached/c82a2e5)
GTK+ 2.24.23 (Raleigh theme)
Package version: 312000070
=== Apple Developer Tools ===
Xcode 6.1 (6604)
=== Xamarin.iOS ===
Version: 126.96.36.199 (Trial Edition)
Build date: 2014-12-18 16:42:49-0500
=== Xamarin.Android ===
Version: 188.8.131.52 (Trial Edition)
Android SDK: /Users/jatin66/Desktop/Backup/android-sdk-macosx
Supported Android versions:
1.6 (API level 4)
2.1 (API level 7)
2.2 (API level 8)
2.3 (API level 10)
3.1 (API level 12)
4.0 (API level 14)
4.0.3 (API level 15)
4.1 (API level 16)
4.2 (API level 17)
4.3 (API level 18)
4.4 (API level 19)
4.4.87 (API level 20)
5.0 (API level 21)
Java SDK: /usr
java version "1.7.0_65"
Java(TM) SE Runtime Environment (build 1.7.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
=== Xamarin.Mac ===
Version: 184.108.40.206 (Starter Edition)
=== Build Information ===
Release ID: 507000660
Git revision: 6a74f9bdb90d9415b597064d815c9be38b401fee
Build date: 2014-12-18 00:38:00-05
Xamarin addins: 57be0f5e1433cb58b70ea9b52e9dc77ad791be40
=== Operating System ===
Mac OS X 10.10.0
Darwin Jatin66s-iMac.local 14.0.0 Darwin Kernel Version 14.0.0
Fri Sep 19 00:26:44 PDT 2014
This behavior is expected