I am developping an app for personal use in Android.
Is there any way I can get a unique Facebook ID for a contact in my phone, if I already linked the contact with its Facebook profile? I don’t know how to query Facebook for a given contact…
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My suggestion is work through the native Facebook SDK tutorial for Android and you’ll be able to do what you’re looking for.
To be more specific even, you can then use the Graph API to query this type of information. Once familiar with this API you can use the User object to look up both public and private information about a given Facebook contact.
Hope that helps!