Send message from server-side(Java) to Facebook users - java

I've a site that performs a lot of processings asynchronously, and in certain moments, should to send private messages to users that previously have installed the Facebook app of my site.
Is it possible to send messages from server-side (Java) directly to these users?
Thanks.

This is not possible, if it was, imagine the amount of spam Facebook users would be receiving.
Alternatively, you can access their emails (with the appropriate permission), and use that instead.

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How to send a chat message to microsoft teams user from an external system upon event?

I need help with Microsoft teams integration. I have an system from which I want to send chat message to a particular user in MS teams upon an event in my system. How do I go about implementing this. The teams graph api documentation is not looking clear to me. Like it has body but no head and tail. I'm confused on where to start for this. I understand I need to use Graph API's create/send chat api to send messages but it says I need to configure a delegate user for this? How do I send messages on behalf of a external system? Can I can use Teams Java sdk based application? Or I need to create a bot? But I think it's for one-2-one conversation is it? I only want to send a one way message from external system to user. Someone with experience in this pls help me on a good approach for this.
All I want is to send chat message from external system to a user in teams.
You cannot use Graph API in this scenario if you want it on behalf of External system. The API is only available when you are having delegated permission.
Other option would be to create a Notification only bot. In this case please keep in mind that the bot needs to be installed in Teams of user you want to send notification. You can use this graph API to install bot in user's Teams- Install app for User.
Once it is installed you need to have user's Conversation.Id and ServiceUrl (maybe store it in database for all users). When you are done with everything you can send Proactive messages.

Sending Teams chat message to person/channel from java service

I need to send a Teams message to user/channel from the java service. These are notifications about events that happen in the application (e.g. when someone sells a product, they should receive a message on the teams that the product has been sold). I have already configured Microsoft Graph API for my application in Azure but as far as I know it is not possible to send message directly to users using "Application" permissions. (DOCS)
Is it any walk around for this restriction? Can I use a newly created account specifically for my purposes to authorize from the Java service in graph API and then sending messages to users?
I also found information about bots and sending proactive notifications to users. Is it possible to use it in my case as a proxy between java app and Teams user?
If I have multiple customers from multiple Microsoft organizations and I want to provide them my bot with proactive notification feature How should I deploy it? Does each client have to provide me an access to the Microsoft AD with application permissions and add my bot to his Bot Service? Or it is possible to deploy the bot only in my environment and make it available to my clients somehow?
What you're trying to do is called proactive messaging and you can read about it here: https://learn.microsoft.com/microsoftteams/platform/bots/how-to/conversations/send-proactive-messages
You can deploy your bot wherever you like so long as you make sure the Teams app is published. You can make your bot available to everyone by publishing to the Teams app store, also called AppSource: https://learn.microsoft.com/microsoftteams/platform/concepts/deploy-and-publish/appsource/publish
If you don't want the app to be available to everyone, there may be a way to publish it to individual app catalogs: https://learn.microsoft.com/MicrosoftTeams/manage-apps

Send requests to Google Assistant from Java

We have developed a Google Action with Dialogflow that responds to personalized requests from users and performs some tasks that require a certain amount of time, usually several minutes.
Our goal is to announce the result of the tasks using the "Broadcast" feature of Google Assistant, but we can't find a way to send the command to Google Assistant.
Our agent receives the user's request and launches a Java application that executes the task, so it is the Java application that must communicate with Google Assistant when the process is finished.
From the Java application we can communicate with the agent using Dialogflow RPC API, but not with Google Assistant.
Is there any way to send the request to Google Assistant from the Java app? or... since we can communicate with our Google Action Agent... how could we send the request through the agent?
In other words, could the agent communicate with google assistant to use any of its features, for example, "Broadcast ..."?
We have checked Google Assistant SDK as alternative, but we are confused about it.
Please, excuse me for my bad English.
Any help would be appreciated. Thanks!
The "Broadcast" feature is not available to user-developed Actions, and probably not a good scheme to use in any event - if users will need to wait for a while for an answer, they probably don't want the answer suddenly announced when they're not expecting it.
Actions are typically meant to be conversational, rather than taking a while to reply with the answer, which is why there is a 5 second limit on how long the fulfillment has to do processing. If you do need to take a while, you have a few options available to you:
First is that you can use some other method outside of the Assistant to deliver the answer - possibly using something like Firebase Cloud Messaging or sending email to the user.
Similarly, you might be able to use notifications. In this scenario, your Java program would send a notification through the Assistant to the user when the information is available and store the result. The user can then activate the notification to continue the conversation and get the result. This has the advantage that the answer isn't just blurted out, possibly when the user isn't ready for it, but does have a downside that speakers don't (yet) support notifications.
You can also look into using a Media Response to set up a way for you to poll for new messages periodically. Under this scheme, you would fire off the Java program which would get the result and then store this in a way your fulfillment server can access. In your reply to the user saying you're working on the results, you would include a Media Response for some audio that plays for, say, 15 seconds. When the audio finishes, your Action will be called again and you can check to see if the result is available. If so, you send the result and continue or end the conversation. Otherwise, just send a Media Response.

Google Cloud Messaging single request

I've been searching over the web but I can't seem to find some straight answer.
I've got an application developed and now I need to add it notifications. My issue is that I need each device to be unique and send each one of them a different notification. (I don't mean ONE UNIQUE notification) but I mean to send some users a notification and others don't.
How can this be done?
As a part of the GCM infrastructure, you will need to have your own web application that will allow individual instances of your app to register. When this happens, your Android application will pass to the web application a registration ID along with any additional information that you can use to identify the device. Once you have this information stored, you can pick and choose which device should receive your notification.
See: Architectural Overview section in the http://developer.android.com/google/gcm/gcm.html

How to access the email accounts in third party application in android?

I am creating an application to access a GMail account and some other EMail accounts that are not GMail. How can I access the inboxes of those email accounts my application?
I assume the following:
You want to use Java.
You are trying to retrieve a list of emails.
You need to do this for GMail and non-GMail accounts.
You didn't mention anything about persisting the mails on your device, so I assume you want a quick snapshot of the inbox.
You didn't mention whether you want to leave the emails in the inbox or delete them upon retrieval, so you need a choice concerning that option.
You have no knowledge how fetching EMails works technically.
So first you need to decide on how to access the mails. As you need to access GMail and non-GMail accounts, it seems that accessing the mails via POP3 would be a natural fit. "Usually" this access method will also delete the mails from the users inbox, but there is an option to download mails without deleting them. Authenticating via POP3 is handled in numerous ways, so I would go for a library that does this for you.
I am neither an Android Developer nor do I have much to do with Java outside of JSF, but the Java Mail API seems to be capable of doing POP3 retrieval. And there is an implementation for Android.
Apart from that, your GUI might be missing a possibility to specify a server, a port and an option to pick the relevant encryption. You can of course "guess" these parameters from the given domain of the users email address, but you will need this information to retrieve the emails.
And of course you could also use IMAP, which the Java Mail API also seems to be capable of.

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