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Send Email from android Using Firebase

Can we send emails within android using firebase , i have tried several libraries like GmailBackground,BackgroundMail, custom method of Javax to send mail , but unable to send any email ,not even a simple one.
So I wonder if Firebase give such a feature , it would be great ?
Firebase Email Sending Blog post is showing empty is i think deleted , but why?
if you have any working source or tutorial to sent an email with attachment , it would be great , thanks

I've been researching this all day...
Option with third-party: SendGrid.com
There's actually a blog post by Tyson Bailey where he explains how he managed to get that done using SendGrid.com (monthly fee) here:
http://blog.onaclovtech.com/2014/07/emailster.html
It even includes the link to a Git he created upon it.
The solution in fact uses AngularJS as #Rexford mentioned in his comment.
Other options... None that I know for the moment, and am exactly researching upon a solution through GCP.
I can tell you they have been working since 2014 on something called "Triggers" that would allow triggering API actions from the database changes (which would helps lot), but seems to have been merged into Google Cloud Functions lately which is in Alpha by the time.

The good news is that as of a few days ago Firebase does now support sending emails... Obviously not from Android - that would be horrible - but from Firebase Fucntions - see here for an example.

Don't think Firebase support that yet..
You can use maligun service with this library for now. I have tested, it works.
https://github.com/sargue/mailgun
https://documentation.mailgun.com/en/latest/quickstart-sending.html#how-to-start-sending-email

Is It possible to add my application in account?

I am trying to add my application in account same as Gmail and whatsapp do.I did lots of search but no luck.
I want something like this:

Stackoverflow isn't a place where you just ask how is something done and expect to get an answer. You have to show what you've tried and what isn't working.
As for your question, applications only appear in the account list if the application is performing some sort of data synchronisation between the app and a server. Therefore you would need to create a sync adapter.
Below are two links that show how to do this
Android Dev Guide - Creating a Sync Adapter
Tutorial for creating your own sync adapter
Hope this helps

Integrat Ecwid shopping cart with my android application

My client want to integrate his Ecwid acoount with android application...
i get products information from Ecwid using diffrent available apis,also able to place order but cant able on further procedure for payment...
some one please help me

Ecwid provides Custom Payments API that should be the proper solution in your case. The documentation is here: http://kb.ecwid.com/w/page/49187841/AuthorizeNet%20Emulation#Custompaymentgateways
Hope that helps.

notify user when website has changed using c2dm in android

i want to make app that make a notification when breaking news has arrived to news website
during my search i found two ways to do that
1- using c2dm server & php & database
2- using timer that scan the website automaticly every time period i decide it
can any one help me by give me an example code for each method or a Tutorial for each method

I'm working on GCM as well. The first comment already told you the right way to solve your problem, but I wanna add something more is that This excellent tutorial
Read it, try to understand it. I think it is quite clear. Hope this help :)

C2DM is deprecated. You could use GCM instead. Go through this tutorial how to get started with it.
You can refer this too.

Integrating application with default in android

I am currently writing an application which performs a search operation requested by the server at a pre-defined server location. Now , i need to integrate this application into the default Search that is provided on the Android Device i.e.. it should appear as an option for the user to perform his search ... like there are options to search the web , android market etc.. So , i should have my app also besides this ...
I am in a fix as to how to do this. Any suggestions, help of any kind , links to tutorials , articles are highly appreciated.
Thank You

You are in need of Suggestion Provider, you can explore this and if i remember correctly, the user needs to explicitly add your app to the search list. (It doesn't happen automatically)
http://developer.android.com/reference/android/content/SearchRecentSuggestionsProvider.html