Develop Reference

Is it possible to add custom parameters to Firebase Dynamic Links?

So I'm developing a game for Android and I'm using Firebase for Authentication, to store user data, etc...
And now, I want to provide the user a way to share their score with their friends, so they can try to beat that score. I was thinking about sharing a dynamic link, and when the second user gets the link, the game would just start from that checkpoint.
But to do that, I would need to send a few data: the level Number, the first user's score, the first user's name.
I checked the documentation here and I saw that I can add some custom campaign parameters. But can I add those other parameters I need? If yes, How do I do it?

build Uri :
builder.scheme("https").authority("deepLink_from_firebase").appendQueryParameter("Param", Param_value).build();
and set that on setDeepLink()

To do this with Firebase, you would need to either encode all the custom data in the URL, or store it in your backend and use the URL as a key to retrieve the stored values. It's possible, but not as intuitive as you're hoping.
I would recommend investigating Branch.io (full disclosure: I am on the Branch team). The Branch service is free, does store an unlimited number of custom parameters with each link (exactly as you described), and interfaces perfectly with the other Firebase functions you are currently using. Branch links are used for this by many of the top apps in the world, including Airbnb, Pinterest, Tinder, and many others.

How to make api.ai agent learn something dynamically?

I am currently using api.ai , to create agent to perform specific tasks, but one question i don't have answer to is , can i make it learn something while chatting , mean that i speak my name is 'John Cena' and she should store it and then whenever i ask her again bot should answer me that. i know there is a way to do it by logging into api.ai web and manually add entries , but it will not help, is there any work around programmatically or automatically ? the file i've been using to practice is given in github . and here is working DEMO

You basically need for your bot to "learn" facts. There are many different ways to achieve this, but recently the most common way is to arrange knowledge into Semantic "Triples" and store the knowledge into a Graph repository (like Neo4j, Titan, Spark Graph, etc). In your example, "my name is John Cena" would translate into a Triple like ("anubava","Name","John Cena"). That way, the next time you are logged in as anubhava and ask "What is my name?", it would translate into a Graph search that will return "John Cena". A word of caution, achieving this is not trivial and would require some significant amount of fine tuning. For more info, you can check here and here.
Finally, most complete solutions (that I know of), are Server Side solutions. If you want for the whole knowledge base to reside in your mobile device, you could probably use the resources there as inspiration, and build your own Linked Data repository using an embedded database.
Hope this helps. Good luck.

To store and recall the user's name, you'll need to set up a webhook with some basic data persistence capabilities. Any database or key-value store would work fine.
Here's the breakdown:
Implement webhook fulfillment for the intent that captures the user's name. The webhook should store the name along with a unique, identifying ID that you should supply from your front-end in either the sessionId or as a context parameter in your call to /query.
Implement webhook fulfillment for the intent that reads the user's name. The webhook should look up the name by ID and return a response that tells the user their name.
The high-level docs for writing a fulfillment webhook are here:
https://docs.api.ai/docs/webhook

Detect if a tweet is tweeted from a mobile phone

I am not sure about how can I tell that a tweet is tweeted from a mobile/smart phone.
I am using Tweepy for the twitter API. Twitter API can only tell us the source/client of a tweet (e.g. Twitter for Android).
That's why the only solution I see, is to compare the name of the client used to tweet to a list of mobile clients. (I should build the list by myself)
The list can be huge, that's why I am searching for another suggestion, hack or magic.
(Alternatively, do you know where can I find a good list of mobile app?)

As you've discovered, you can look at the source parameter.
This will give you two interesting things
The name of the client.
The URL of the client.
I'd suggest a two pronged approach. Look to see if the name says something like "for Android" or "mobile" - and check whether the URL points to iTunes, play.google, or similar.
According to Wikipedia
A new app is registered every 1.5 seconds, according to Twitter.
I would suggest looking at the Top 100 Twitter Applications (or similar) and then build your own list of the most commonly seen apps.

Using Google Transit information in Android app

Google transit provides approximate time of the next bus arriving at a particular bus-stop when you click on the bus-stop icon. This works for trains and even metro lines.
Is there any way I can use these transit information in my own map view? I tried going to the link that is displayed under the timings ( I guess it means thats where google is getting the timings from) but that link is broken...doesnt exist...it must be providing the information to Google only...
So is there any way i can access the Google Transit information?
Thx.

Yes, the data feeds are publicly available and published by the corresponding transit agencies. The available list is here. You'd need to download the data and host it or include it in your app.

In the "worst case scenario", you could download the result of a web query to maps.google.com (such as http://maps.google.com/maps?saddr=new+york&daddr=boston&dirflg=r) to your app and parse the result. Maybe there are even sample-scripts that already do this!

So finally i had to drop the idea...its only available for usa at the link given by #Robby but is (currently) unavailable for quite many countries.
Hoping itll be available soon.
Thx for all the responses.

How to best add a comment/rating system to an android app

I already published an android app where you can see a list of specific objects and detailed informations about them. The list changes every day but some of the objects can appear again.
The application is communicating with a PHP server over HTTP and periodically pulls the list of objects.
I now plan to extend the app to make it possible to rate the objects and add a comment similar to how it is done in the android market. I'd like to avoid forcing the user to sign up for an account for being able to comment.
I see two problems:
The comment-system could be abused by spammers
A comment could be added from another system
So my questions are:
How to protect the system from spam?
How to authenticate the application with the server?
How do I limit the number of comments to one per user and object?
What about the androids device id? Is it unique enough to use it as identifier for the user?
Which other problems do you see?

2020 Commenting/Rating/Reviews Options
Since Socialize is out, here are a few options you can explore:
Build your own comment/rating implementation. Personally I love reddit and how it handles nested comments and ratings. Here's a library I found that implements it beautifully. Please note you'll need to tie this with a cloud-database. This is based on groupie. Article & implementation. Many ways to do this - https://stackoverflow.com/a/59472206/668240
Disqus - SDK's coming soon to iOS and Android.
BazaarVoice - commercial
Social Networks SDKs like Facebook, Twitter, etc. Personally I dislike this as we'll need to authenticate users with respective networks to use the APIs. It's like we are shipping off users of our apps to social networks. If you don't have a problem with that - then it might be for you
Legacy Option in 2014:
You can try out Socialize SDK which is open-source and a really good SDK for the rating and commenting you are looking for. It already has a well-functioning Commenting system built-in along with a 'like/love' facility and sharing to FB and Twitter. Each 'entity' (object in your case) can have metadata associated with it. So all you have to do is construct/use a rating widget, then send that rating with the entity attached to your object. To display your rating/comment is as simple as retrieving them from Socialize.
Each object (element from your app) should be associated with an entity which has a unique key in the form of a URL - sort of like a primary key to recognize your items. This entity can have meta-data - any data that you can insert on behalf of your object. Once you do that, you can retrieve that metadata any time you want.
I've been using Socialize for around a year now. They've matured over this period and are always aspiring to be the best at what they do.
Look at the Socialize Bar at the bottom. Its can be customized to your needs.
What's more - Socialize is free.
As for your questions:
There is comment moderation built into the Socialize Web Component
where you can filter out anything you feel is out of place.
Socialize allows you to authenticate through Facebook and Twitter.
Limiting to one comment per user can be achieved by using their User
and Comments API.
Socialize has both Anonymous authentication as well as Social A/c
authentication. I believe you can remove anonymous auth. So that
ensure that every user is authenticated before rating/commenting.

For authentication, you could use OpenID like StackOverflow does or Facebook authentication. Once you have them authentication, it shoud be easy to limit the number of comments to one per user per object. As far as spam, you could follow StackOverflow's model and allow users to vote comments up or down or flag as spam. Perhaps users with comments that have been voted up would have more power and be able to flag comments as spam.

You'll need some sort of rate limiting. I've used this one in this example before.
So you need a table with the user's ID and how many api calls they have left, and then when their last api call was. Then use the algorithm to update the values in the table every time a method is called.

Read through this, I think it should be possible to create an UUID for every case:
http://android-developers.blogspot.de/2011/03/identifying-app-installations.html
And then keep a hidden api key which is hard coded, or at least get's everytime calculated the same or in enigma style influenced by the time it is used. But you will be never be sure, that it won't be find out by crackers/hackers and maybe abused, you will always have this Problem.
Authenticate with the UUID of the user + api-key.