Incremental build issue when adding Android resource

[jpobst]

Android framework version

net9.0-android

Affected platform version

.NET 9.0.101

Description

Adding a new Android resource to a project causes the incremental build to error with:

Resources\layout\activity_two.xml error APT2126: file not found.

This error comes from the Aapt2Compile task. It is looking for \obj\Debug\net9.0-android\res\layout\activity_two.xml but that file doesn't exist. Presumably some previous incremental step is not running and copying it there?

binlog.zip

Steps to Reproduce

dotnet new android
dotnet build -bl
copy Resources\layout\activity_main.xml Resources\layout\activity_two.xml
dotnet build -bl

[jpobst]

This appears to be because the copied resource does not have an updated "last modified date", thus some earlier target isn't running.

The target needs to check if resource(s) were added/removed as well as "last modified date".

[dellis1972]

Yes, this is a modified date issue. the new file has a modified date time earlier than the obj\Debug\net9.0-android\res.flag.
So _GenerateAndroidResourceDir is skipped.
I'll add a check for file hashes.