Cannot import my selfsigned CA, it seems to not recognize the raw directory

Question

I'm trying to import my selfsigned CA in android so I can make HTTPS POST to a web server I selfsigned. Following Google Doc(https://developer.android.com/training/articles/security-config.html#ConfigCustom) I created directory res/raw/mycertificate and added my certificate in it. Created /res/xml directory and added the xml file network_security_config.xml to the manifest. It's in the network_security_config.xml file that I'm having some trouble, because when I create the tag Android Studio get me an error on src telling me "Missing src resource" but I placed the certificate.pem in the directory /res/raw/mycertificate, and the folders raw and mycertificate does exists. How can I make Android Studio take correctly that path folder?

<network-security-config>
<domain-config>
    <domain includeSubdomains="true">192.168.1.200</domain>
    <trust-anchors>
          <certificates src="@raw/my_ca" />
    </trust-anchors>
</domain-config>

Answer 1

Omit the file extension for your certificate file in the network config XML file. If your cert is at res/raw/my_cert.pem, use this XML code:

<network-security-config>
<domain-config>
    <domain includeSubdomains="true">192.168.1.200</domain>
    <trust-anchors>
          <certificates src="@raw/my_cert" />
    </trust-anchors>
</domain-config>