Google Cloud Vision API Permission Denied

Question

I was trying to run the sample app, found here Github Sample, I have created a certificate and created a API Key and applied as instructed. But when I upload the Image I am getting this Exception. I dont know where I have made a mistake. Have I missed anything?

failed to make API request because {
    "code": 403,
    "errors": [{
        "domain": "global",
        "message": "Requests from this Android client application <empty> are blocked.",
        "reason": "forbidden"
    }],
    "message": "Requests from this Android client application <empty> are blocked.",
    "status": "PERMISSION_DENIED"
}

Answer 1

I suspect that you are creating an Android API key, restricted to your app, with your sha1 fingerprint registered.

This is great! Unfortunately, the non-android-specific Google API java client library doesn't yet fully support API requests for android api keys, like the android-specific one does. This means that API requests aren't including some headers that authenticate the key/app to the API endpoint, which causes that error (note the client application <empty> in the error message - the <empty> would be your package name, if the request was formed as expected).

I'm still looking for what to do about that - will update if / when I find one.