Load local WebExtension issue, plz help!

Add-ons Development
#1

Hello everyone, I’m an Android develoer.
when I used org.mozilla.geckoview:geckoview in the Android application to load html under local assets folder, I tried to call the WebExtensionController.install method to load a remote or local signed xpi file.

In the callback of onInstallPrompt, I manually returned GeckoResult.allow()

The log shows that the extension was installed successfully, similar to
Extension installed: WebExtension {location=resource://android/assets/aaa.xpi, id=messaging2@example.com, flags=0},

but this flags=0 means that I cannot Call browser.runtime.connectNative("xxx")

I have already specified the required permissions when making xpi in the manifest.json

"permissions": [
    "nativeMessaging",
    "nativeMessagingFromContent",
    "geckoViewAddons",
    "<all_urls>"
  ]

The strange thing is that if I directly use the source code for making xpi, this problem will not occur.

#2

It appears that GeckoView only exposes native messaging to built in extensions. This page from the GeckoView docs shows how to use nativeMessaging in a GeckoView extension, but all the examples they provide use either installBuiltIn() or ensureBuiltIn() to install the extension.

Digging a bit deeper, I found a comment on the installBuiltIn() method that states:

Built-in extensions have access to native messaging, don’t need to be signed and are installed from a folder in the APK instead of a .xpi bundle.

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