Xtend + Android support library = error: cannot access DrawerLayoutImpl

[tobykurien]

This error happens the first time you build a project that uses the Android support library. To reproduce, try cloning WebApps (https://github.com/tobykurien/webapps) and building by running gradle assembleRelease:

:preBuild UP-TO-DATE
:preDebugBuild UP-TO-DATE
:checkDebugManifest
:preReleaseBuild UP-TO-DATE
:prepareComAndroidSupportAppcompatV72221Library
:prepareComAndroidSupportSupportV42221Library
:prepareComGithubTobykurienXtendroid0121Library
:prepareDebugDependencies
:compileDebugAidl
:compileDebugRenderscript
:generateDebugBuildConfig
:generateDebugAssets UP-TO-DATE
:mergeDebugAssets
:generateDebugResValues UP-TO-DATE
:generateDebugResources
:mergeDebugResources
:processDebugManifest
:processDebugResources
:compileDebugXtend
[snip - warnings]
:generateDebugSources
:processDebugJavaRes UP-TO-DATE
:compileDebugJava
/WebApps/src/com/tobykurien/webapps/activity/BaseWebAppActivity.java:35: error: cannot access DrawerLayoutImpl
public class BaseWebAppActivity extends AppCompatActivity {
...

The error only happens the first time (i.e. no build directory), thereafter it compiles fine. Unfortunately, this means that Travis CI builds fail. Happens with Gradle 2.2.1 and even Gradle 2.5.

One way to make this build pass the first time is to extract the JAR file containing the class (i.e. build/intermediates/exploded-aar/com.android.support/support-v4/22.2.1/jars/libs/internal_impl-22.2.1.jar and copy it into a libs folder and include that in the gradle dependencies. This is not ideal (and means my app isn't accepted by FDroid).

Also seems to affect Kotlin (https://devnet.jetbrains.com/message/5538844) and Groovy (groovy/groovy-android-gradle-plugin#31) and Maven (simpligility/android-maven-plugin#621) though there seem to be different work-arounds there.

Could you please look into why this might be happening? Any workarounds without including a binary jar file?

[oehme]

Does this happen in a pure Java Android project?

[tobykurien]

No it does not.

[oehme]

Thanks for the example project, I'll look into it.

[tobykurien]

Thank you!

FYI:

• Easy way to reproduce is to simply delete the build folder and re-build.
• I tried removing the xtend gradle plugin from the build.gradle file, and added xtend-gen to the source paths instead, and the build worked fine the first time around.

[tobykurien]

Some more info: if you delete the build folder, then run this, it works:

gradle prepareReleaseDependencies
gradle assembleRelease

[oehme]

I think I know the reason for this. I'm on vacation for this week, but will get back to you when I return.

[oehme]

Hey Toby,

sorry for coming back so late, we are pretty busy with polishing 2.9 =)

This issue no longer happens in version 0.4.8 of the plugin. Your example uses 0.4.7

[tobykurien]

I tried using 0.4.8 and it still happens

[oehme]

It is harder to reproduce than I thought. It works when I run "clean build", but not when I run "clean" and then "build".

I could solve the issue by pushing the classpath configuration even further down the lifecycle. Will be out as 0.4.9 soon.

[tobykurien]

Thanks for the fix! It seems to work on that particular project now, using v0.4.9, but strangly, it still happens if you build this project from scratch: http://github.com/tobykurien/XtendApp (i.e. delete build and app/build directories before gradle assembleDebug)

Error:

app:compileDebugXtend

ERROR:  MainActivity.xtend - 
67: The method or field toolbar is undefined for the type MainActivity

ERROR:  MainActivity.xtend - 
43: The method or field drawerLayout is undefined for the type MainActivity

ERROR:  MainActivity.xtend - 
43: The method or field toolbar is undefined for the type MainActivity

ERROR:  MainActivity.xtend - 
44: The method or field drawerLayout is undefined for the type MainActivity

ERROR:  MainActivity.xtend - 
47: The method or field drawerLayout is undefined for the type MainActivity

ERROR:  MainActivity.xtend - 
61: The method or field drawerLayout is undefined for the type MainActivity

ERROR:  MainActivity.xtend - 
61: The method or field drawer is undefined for the type MainActivity
...