DeleteBinObj bug with AndroidResource

[jonathanpeppers]

Steps to Reproduce

1. File | New Project | Android App (Xamarin) | Tabbed App, set Minimum Android Version to Android 5.0 (Lollipop)
2. Build
3. Open Resource\layout\activity_main.axml (I used the ancient VS XML editor instead of the designer, to remove that from the equation)
4. Add a new TextView
5. Run via F5 or the Play button

A crash at runtime is encountered:

Unhandled Exception:

Android.Views.InflateException: Binary XML file line #1: Binary XML file line #1: Error inflating class android.support.design.widget.BottomNavigationView occurred

On this line:

SetContentView (Resource.Layout.activity_main);

My TextView source is basically the default if dragged from the toolbox in the designer:

 <TextView
 android:text="Text"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:minWidth="25px"
 android:minHeight="25px"
 android:id="@+id/textView1" />

Once in this state, a Rebuild fixes the problem. You can deploy again to see the issue resolved.

Expected Behavior

Modifying a layout should not cause a runtime exception!

Actual Behavior

Modifying a layout causes runtime exception! Rebuild resolves the issue...

Version Information

I have been able to repro this on VS 2017 15.8.4, and the build of Xamarin.Android we will be shipping with 15.9 P3.

Log File

Relevant logs: DeleteBinObj.zip

VS bug #686581

[jonathanpeppers]

Hmm, weird classes.dex has the type from the error message!

obj\Debug\MonoAndroid81\android\bin> dexdump.exe .\classes.dex | Select-String 'Landroid/support/design/widget/BottomNavigationView;'

type : 'Landroid/support/design/widget/BottomNavigationView;'

So perhaps obj\Debug\MonoAndroid81\android\bin\packaged_resources is the file that's messed up?

I'll keep digging...

[jonathanpeppers]

@dellis1972 repro project here: https://github.com/jonathanpeppers/DeleteBinObj

My commands were:

git clean -dxf
msbuild .\DeleteBinObj\DeleteBinObj.csproj /bl:build.binlog /restore
git stash pop
msbuild .\DeleteBinObj\DeleteBinObj.csproj /bl:install.binlog /t:Install

Instead of git stash pop you can just add this to Resource\layout\activity_main.axml:

 <TextView
 android:text="Text"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:minWidth="25px"
 android:minHeight="25px"
 android:id="@+id/textView1" />

[Silic0nS0ldier]

If anyone hits this a work around is to add

<Target Name="BeforeBuild" Condition="Exists('$(ProjectDir)obj\Debug\MonoAndroid81\android\src\android\support\compat\R.java')">
 <Delete Files="$(ProjectDir)obj\Debug\MonoAndroid81\android\src\android\support\compat\R.java" />
</Target>

Or something similar (MonoAndroid81 might be different) to the project file.

[Silic0nS0ldier]

Fix is out in Visual Studio 15.9 Preview 4, and I can confirm it works.