How to query all contacts that belong to an account?
问题 Background Contacts on the address book can have an account data that's attached to them. Each app can have an account, and then add its own information for the contact. Apps such as Telegram, WhatsApp, Viber,... - all create an account that adds information and/or actions to contacts. Here's an example of a contact that has both WhatsApp and Viber accounts for it: The problem I'm trying to figure out how to fetch all contacts that have a specified account. Since WhatsApp is the most popular