Create Email account from type existing Account Services

Question

I have gone through SampleSyncAdapter sample project provided by Android doc, but as I understand, there we need to add an account of custom Account se

Answer 1

You are not allowed to do this for security reasons.

Imagine accounts being configured with settings that are unknown to the users - the users might not even know the accounts are being created at all! This would be a prime target point for malware, spam etc since no captcha, user permission or any other authentication is involved.

So this is a security measure....and a good one at that.