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I've create a module at Android Studio. In module code, I want to show a dialog which uses a layout defined in the module. When I reference layout like net.gwtr.module.R.layout.my_dialog_layout, I get this exception;

java.lang.ClassNotFoundException: Didn't find class "net.gwtr.module.R$layout" on path: DexPathList[[zip file "/data/app/net.gwtr.moduletest-1.apk"],nativeLibraryDirectories=[/data/app-lib/net.gwtr.moduletest-1, /vendor/lib, /system/lib]]

I think the reason is that resources are merged when you add a module to project. It did not create different resource ids for the module package name. So i cannot reach to resources from module package.

How can I reference resources of module in module code?

Edit1: I reference resource like this;

Dialog dialog = new Dialog(context); dialog.setContentView(R.layout.my_dialog_layout); dialog.show();

Edit2: I found a way but i don't want to use this every time when I reference resource.

I can reach resources when I get resource id with this;

context.getResources().getIdentifier("my_dialog_layout", "layout", context.getPackageName())
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  • How are you referencing R? Show your code please. Commented Aug 21, 2014 at 8:32
  • Reproduced you problem: buildToolsVersion '20.0.0' Gradle 0.12.2 Android Studio 0.8.6. Also tested it with other resources - R class not found. Commented Aug 21, 2014 at 14:31
  • @ferar1988 thanks for sharing your solution , did you find another more convenient way to do this ? Commented Apr 28, 2016 at 7:39
  • There is a long treatment of these questions here: stackoverflow.com/questions/62694206/… Commented Jul 18, 2020 at 8:48

5 Answers 5

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4

In your gradle file from your module.

Are you put compile your other module?

compile project(':othermodule')
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3 Comments

yes, i can reach any module classes. But module cannot reach its own resources.
Have you compiled it as apklib?
No, i just create a new module inside the project.
4

Yes, resources from libraries are merged into your application (so basically there's a global namespace under R; this is why you have to choose resource names in modules with a little care, e.g. use a prefix, to prevent accidental mix-up with resources from other modules).

Within the defining library module, and your application module by virtue of the resource merging, you should just be able to refer to R.layout.my_dialog_layout (android studio should auto-complete). I've a similar situation working fine in my project (@jimpanzer: I tried under same versions as you, with compileSdkVersion = 16 and 20).

Some suggestions:

  • make sure there are no import statements of R anywhere. As far as I can see you shouldn't need any, if you either address library resources from your application module, or from the same library module.

  • clean your project and rebuild, perhaps even android studio caches. In the old days, sometimes R.java would get screwed up.

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2

I'm converting a legacy project to android studio and managed to get the package names mixed up in the module. Although the R file was generated it was in the wrong package.

In the module check the resource to id mapping file

build->generated/source->debug->(app package)->R

or

build->generated/source->release->(app package)->R

The package of this file should match the import of R e.g. in your activity

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I had to add the package name for the resource, e.g. instead of R.drawable.icon, I needed com.example.brand.module_name.R.drawable.icon

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1

import net.gwtr.module.R.* and access the layout via getResources() like you had before

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