Develop Reference

Fetch Facebook Friend Id in Android on Invite send to the user

My question is fetching the facebook friend's id in android.I have integrated my app to send the invites to the user.But I need to fetch the friend id to whom the invite has been send.Is there any way can this be achieved.

You can try the Facebook App Invite
https://developers.facebook.com/docs/app-invites
or
https://developers.facebook.com/docs/games/services/gamerequests

How send invite to user using LinkedIn android?

I create android app using LinkedIn SDK. I want send invite in email for user which does not register in network. How do i do it?

It doesn't seem to be part of the public API. At least it's not exposed on https://developer.linkedin.com/ and https://apigee.com/console/linkedin

How to send an official confirmation mail of confirming order from an app using the details provided by user in a e-commerce app.

I am developing an android app for an E-commerce website. I am a newbie in this field. I want to implement cash on delivery option in the app. I am taking the details of the user like name, email,shipping address in the app. After placing order I want to send a confirmation mail to the email id provided by user from my official email of the company. Please guide me with the code,how can I do that? Thanks in advance.

It is very much possible
http://php.net/manual/en/function.mail.php
Check this stackoverflow question too.
Send mail by php mail() function

Google+ send invitation message from app

In my android app, I wish to allow user to invite friends from different social platforms. User already can invite friends from Facebook, VK, from his contacts list on phone, but I can't find way to send invite message to Google+. Is this really possible? Or maybe I can send message somehow using google_id?
I don't need to post on my wall.

Take a look at this link.
There is a setRecipients method, which allows you to share it only with a few persons. It's not the same as private messaging, and it will appear on the wall (only for you and those persons), but it looks like G+ is supposed to make it this way.

Send message to multiple facebook friends using Android facebook API

I am developing an application in which user can share messages with his/her Facebook friends. I am using Facebook API for android. I am able to authenticate user, as well as get my friend list as a Facebook user and also post message on wall, but I am looking for sending message/post on wall to my friends and I didn't get any solution for that, so how can I achieve this?