Capacitor: Assets in folder with underscore not loaded on Android

[olivereisenhut]

Description of the problem:
When trying to load an asset in folder beginning with an underscore like "_next" a 404 is returned in the browser.
Affected platform

• [x] Android
• [ ] iOS
• [ ] electron
• [ ] web

OS of the development machine

• [ ] Windows
• [x] macOS
• [ ] linux

Other information:

Capacitor version:
1.1.0
node version:
v11.6.0
npm version:
6.5.0-next.0
CocoaPods version:
-

Steps to reproduce:
1) npx @capacitor/cli create
2) npx cap add android
3) mkdir www/js/{_example,example}`` 4)touch www/js/{_example,example}/test.js`
5) add following to index.html

  <script src="js/_example/test.js"></script>
  <script src="js/example/test.js"></script>

6) run the app an checke dev tools -> the file is not loaded

Link to sample project:

[jcesarmobile]

This is really an Android "feature". By default it doesn't copy assets folders starting with _ to the resulting apk (see https://android.googlesource.com/platform/frameworks/base/+/b41af58f49d371cedf041443d20a1893f7f6c840/tools/aapt/AaptAssets.cpp#60).

You can workaround it by adding custom aaptOptions with the pattern to ignore, removing the <dir>_* so they get copied. Something like this:

aaptOptions {
    ignoreAssetsPattern '!.svn:!.git:!.ds_store:!*.scc:!CVS:!thumbs.db:!picasa.ini:!*~'
}

It should go in the app's build.gradle inside android -> defaultConfig

android {
    ...
    defaultConfig {
        ...
        aaptOptions {
            ignoreAssetsPattern '!.svn:!.git:!.ds_store:!*.scc:!CVS:!thumbs.db:!picasa.ini:!*~'
        }
    }
}

[JohnGalt1717]

@jcesarmobile I'm having trouble getting this to work. In my case it's blazor wasm....

I see this in the logs:

E/Capacitor: Unable to open asset URL: http://localhost/_framework/blazor.webassembly.js

here's my config in the ./android/app/build.gradle file:

android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    defaultConfig {
        applicationId "com.store.app"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        aaptOptions{
            ignoreAssetsPattern  '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

I saved, sycned and hit run. To no avail.

What am I doing wrong?

edit I also tried copying in the bin/**/wwwroot instead of just the wwwroot and then in android studio I get duplicate resources errors with the above configuration which seems bizarre.

Thanks!