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Created attachment 12048 [details]
When Xamarin.Android applications with tabs are run on a physical HTC One X with Android version 4.1.1, the selected tab is white with white text instead of black with white text like it's supposed to be.
This has been tested on several devices and the tabs display correctly on all of them: Physical HTC One M9 with Android version 5.0.2, physical Galaxy Nexus with Android version 4.0.4, simulator HTC One X with Android version 4.1.1
I also wrote a Java app in Android Studio with the same basic tabs, and it works correctly on the HTC One X with Android version 4.1.1.
Java app: https://www.dropbox.com/s/8uvq116duwrbzc0/JavaTabs.zip?dl=0
### Steps to reproduce
1) Download and open the attached app (SamplePlainAndroid)
2) Run the app on a physical HTC One with Android version 4.1.1
3) Click on the tabs
### Expected results
The selected tab is highlighted as expected (blue-black)
### Actual results
The selected tab is white with white text
### Additional information
=== Xamarin Studio ===
Version 5.9.4 (build 5)
Installation UUID: 1f52eea2-a387-4a2c-96c1-4637c8f8567a
Mono 4.0.2 ((detached/c99aa0c)
GTK+ 2.24.23 (Raleigh theme)
Package version: 400020005
=== Apple Developer Tools ===
Xcode 6.3.2 (7718)
=== Xamarin.Android ===
Version: 18.104.22.168 (Enterprise Edition)
Android SDK: /Users/amalias/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
2.3 (API level 10)
4.0.3 (API level 15)
4.4 (API level 19)
5.0 (API level 21)
Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)
=== Xamarin Android Player ===
Version: Unknown version
Location: /Applications/Xamarin Android Player.app
=== Xamarin.iOS ===
Version: 22.214.171.124 (Enterprise Edition)
Build date: 2015-06-30 15:19:13-0400
=== Xamarin.Mac ===
Version: 126.96.36.199 (Enterprise Edition)
=== Build Information ===
Release ID: 509040005
Git revision: 8010a90f6e246b32364e3fb46ef2c9d1be9c9a2b
Build date: 2015-06-08 16:52:06-04
Xamarin addins: 7e93e9c3503f28770f23ce1b7eafd829919f18e8
=== Operating System ===
Mac OS X 10.10.3
Darwin amalias.local 14.3.0 Darwin Kernel Version 14.3.0
Mon Mar 23 11:59:05 PDT 2015
This appears to be an upstream issue. The original Java test case from comment 0 was using:
While the Xamarin test case was using:
Switching the Xamarin test case to use the "Support v7" classes (via the "Xamarin.Android.Support.v7.AppCompat" NuGet package) stops the problem.
And correspondingly, switching the Java test case to use the non-"Support v7" classes causes the _same_ problem to appear in the Java test case.
I will attach the updated Java test case that demonstrates the problem in the next comment.
Created attachment 12097 [details]
Updated Java test case that shows the same problem
Created attachment 12098 [details]
Screen capture from the updated Java test case
In case it's helpful, it appears that the reason the original Java sampled worked was actually _not_ due to the use of the "Support v7" classes, but instead because the `android:theme` was set to "Theme.AppCompat.Light.DarkActionBar" in `AndroidManifest.xml`.
Add the following property to the `[Activity]` attribute in "MainActivity.cs" in the original Xamarin test case from comment 0:
Theme = "@android:style/Theme.Holo"
This was sufficient to stop the problem in my tests. (You can use other themes  too if you prefer.)