Android Google App Invite sample is not sending email and message,What i am doing wrong?

问题

I am using Android Google App invite sample and following all guidelines but it is not sending any messages and emails, it gives message

Message Failed to Send

and in logs i am getting

onActivityResult: requestCode=0, resultCode=3`

getInvitation:onResult:Status{statusCode=CANCELED, resolution=null}

回答1:

One possibility is an issue with your client configuration file. Make sure you followed Step 2: get a configuration file in the App Invites guide and have added the the google-services.json file to your project.

Check that package_name and certificate_hash match your credentials in Developers Console for the Default Demo App. Note: the certificate_hash will not have the colon delimiters.

  // from: google-services.json
  ...
  "oauth_client": [
    {
      "client_id": "<id>",
      "client_type": 1,
      "android_info": {
        "package_name": "com.google.android.gms.samples.appinvite",
        "certificate_hash": "<Signing-certificate fingerprint>"
      }
    }
  ],

回答2:

In my case I was creating dubug build. But when I change Build variants from debug to release the problem solved.

来源：https://stackoverflow.com/questions/34940408/android-google-app-invite-sample-is-not-sending-email-and-message-what-i-am-doin