Cannot reference raw resources from Network Security Configuration XML

Question

I'm trying to follow the Android documentation for using custom certs here. The desired network config file is:

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config>
        <trust-anchors>
            <certificates src="@raw/extracas"/>
            <certificates src="system"/>
        </trust-anchors>
    </base-config>
</network-security-config>

I have already created network_security_config.xml and have added the reference android:networkSecurityConfig="@xml/network_security_config" to my manifes. I have .crt files I need to include but I am having two problems:

1. I cannot create a directory in my raw folder, when I do, it creates the directory in my file system but not in my raw resource directory in the project.

2. In lieu of a directory I just reference my .crt files directly in the raw folder, but when I try to reference the certs, here's my network_security_config.xml

   <?xml version="1.0" encoding="utf-8"?>
   <network-security-config>
       <base-config>
           <trust-anchors>
               <certificates src="@raw/cert_cubic_trusted_ca-sha256.crt"/>
               <certificates src="system"/>
           </trust-anchors>
       </base-config>
   </network-security-config>
   

I get a red squiggle with error "missing src resource.", and when I attempt to build, the build log outputs error:

AGPBI: {"kind":"error","text":"error: resource raw/certname.crt (aka com.comname.appname:raw/certname.crt) not found.","sources":[{"file":"/Users/205314/project/appname/app/src/main/res/xml/network_security_config.xml","position":{"startLine":5}}],"original":"","tool":"AAPT"}
:app:processDebugResources
:app:processDebugResources FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:processDebugResources'.
> Failed to process resources, see aapt output above for details.

I do not know why I am unable to reference assets in my raw resource folder from XML or create a folder within it, this seems to be my biggest issue. I can reference raw resources with R.raw in code but I have never needed to reference using @raw and I'm not sure why it isn't working as described.

Answer 1

As per the Accessing resources documentation, the resource name is

the filename, excluding the extension

So you need to remove the .crt from your src:

<certificates src="@raw/cert_cubic_trusted_ca-sha256"/>