Google Play: find traffic peaks - analytics

Is there a way to see in the Google Play console how many users at which time of the day were actively using my app?

Not at the moment. If you want analytics like this then you probably want to add a solution like Firebase Analytics to your app.

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React Native Upload to YouTube

I am trying to upload a video that I take locally using react native camera and then send it to youtube for processing and then want to display that video on a react.js web dashboard.
We have tried using fetch-blob to upload the video and cloud firestore to store the video. We are not sure at a high level on how to go about the uploading to youtube. I know there is upload docs, however can we physically go about uploading straight from our react-native project to youtube, or would we have to upload to a database such as firebase and then use a cloud function to send it to youtube? Has anyone attempted this? The other alternative is that we can upload to S3 and then use AWS cloudstream to play back but that seems like overkill if there is a simple youtube upload that we can use. Do we have to authenticate a user to youtube before it would work? We do not want anyone having to log into a google account. We are hoping just to have an application created with youtube that we can upload to our channel.
Thank you!
Answer
You can absolutely upload a video to YouTube in many different ways. You mentioned a few options and I will line out how those could work for you.
Do we have to authenticate a user to youtube before it would work?
You will have to authenticate to YouTube in order to upload to a YouTube account. You could very well have one account for your app to use and when your users make videos the app could upload them directly to that account. I do highly advise against that though. Google is not very forgiving and the second someone uploads something to violate Google Policies I suspect you will be banned.
That leaves me to believe the best way here would be to use Auth0 to authenticate users and upload to their accounts. Otherwise maybe look into other options.
Possible Options
Option 1
It might be possible to upload all the videos to one YouTube account and make them all private. Then retrieve those videos and play them on your own site. Possibly something like that could work but it is probably a long shot. That could at least keep you from getting banned because of a user violating Google Policies.
Option 2
Another option would be to make one YouTube account. Save the videos to your server when the users creates them from your mobile application. Then have a waiting period for the video to post to YouTube in order for you and your team to have time to approve them.
At least this way you can use YouTube and have one account, but not take the chance of any repercussions from the videos people are posting.
Problem
How to upload a video from your mobile app using React Native to youtube.com
Solution 1
Upload straight from React Native. You can Use the Google APIs to upload directly to youtube. Google has an extensive API. You will have to create a Google API account and make sure to activate the APIs you want to use. Here is some information I found using the Google Javascript API to work with Youtube.
If you go to this link you can see some information on the scopes of this API.
Here is one scope mentioned on that page.
https://www.googleapis.com/auth/youtube.upload
Using Gogoles APIs you can upload videos directly to the youtube account.
Solution 2
The second solution is to post the video to your server, then once it hits the server use some other server side language to interact with Google's API. This could come in handy for other reasons. Like if you are better with a language other than JavaScript. For example Python might be your favorite language. In that case here is a Python Github repo that does just what your trying to do.
You could very well implement the repo mentioned above to your server and post the video you create from your phone to the server. Allowing the Python script to handle posting the video to YouTube.
Side Note
I do not think Firebase or really any database is necessary for the task you are trying to accomplish. Unless there are other requirements to your problem you have not mentioned.

Testing google analytics

I am new to google analytics and mobile testing and got a task of testing google analytics on one of our in-house application. could you guys please help me by understanding that how can I proceed doing so. I have no idea about google analytics.
Thanks in advance.
Just perform the actions that you are actually tracking and check if a corresponding entry is recorded in the analytics database.
As a starting point, first check if your UA tracking ID is implemented. Secondly, make some interaction with you mobile application and check if the data is available in Google Analytics (e.g. real time report).

Mobile app and cloud

I need to develop an mobile app that is able to:
1) Allow users create profiles with a login system;
2) An area that allow users to search profiles near them by geo position.
Is not an production app, I just need to learn how the things work..
1) To developer a app thus as explained, I need a web service.
But, what is the complete infrastructure needed to deploy this app?
I had read that the amazon delivery one solution called S3...this is all that I need to know as example to study?
What are all the requirements to study this kind of solution by complete???
Thank you
S3 is a storage solution, not really what you are looking for I think. Look at Google's Cloud Endpoints. Simple REST service with lots of tutorials. https://cloud.google.com/products/cloud-endpoints/

What payment gateways work well on appengine?

Well, I've been building some free apps on top of appengine, but now I want to start charging money. My question is:
What is the best way to collect payments from users. Do certain services (paypal, google checkout, etc) work better/worse with AppEngine's library restrictions? Are there any good examples or tutorials to help me learn how to do this?
You can do this any way you want, really - and there's nothing App Engine specific about it. For example, you could use Google Checkout or Paypal, and charge users on any basis you want.
Also just something to point out about the implementation, a simple boolean property on your user object should allow you to easily turn functions in your app on and off, depending on which tier your user has paid for.
Checkout http://Spreedly.com or http://Recurly.com. Both are billing solution SaaS apps. http based api's and easy to use. I use Spreedly.com
If you plan to sell business apps you could integrate with the Google Apps Marketplace which uses Google Checkout for billing.

How to track if browser is Silverlight enabled

I'm trying to get some stats on how many of the visitors to our website have Silverlight enabled browsers.
We currently use Google Analytics for the rest of our stats so ideally we'd like to just add 'Silverlight enabled' tracking in with the rest of our Google Analytics stats. But if it has to get written out to a DB etc then so be it.
Nikhil has some javascript to Silverlight tracking to Google Analytics. I have tried this code but Google Analytics doesn't pick it up.
Does anyone have any other ideas/techniques?
In case you missed it, there's a link to a more detailed article as well in the comments: http://blogs.msdn.com/jeffwilcox/archive/2007/10/01/using-google-analytics-with-rich-managed-web-applications-in-silverlight.aspx
Edit: As David pointed out, this article covers the reverse scenario more (how to write your silverlight app so that it plays well with Analytics).
I think you answered it yourself. The page you are linking to does just that: detect which version of Silverlight the user has (not if s/he installs it). From the page:
After a little poking around, I found that Google Analytics has support for reporting a user-defined field.
...
Basically this detects the presence of Silverlight, and if its available, it records the version as the value of the user-defined field. Now your analytics reports will have one of three values: "(not set)", "Silverlight/1.0" or "Silverlight/2.0".
#Vaibhav
The Using Google Analytics with rich (managed) web applications in Silverlight article is very interesing but is more focused on how to get your Silverlight app to send messages to Google Analytics.
#Cd-MaN
Yeah, I thought that too but I have tried running my page with Nikhil's javascript and Google Analytics didn't pick it up. But I could have screwed something up somewhere.
I'm just interested to know if anyone else has managed to do this (track Silverlight-ness) successfully.
I've written a lightweight Silverlight library that helps make it easy to integrate Google Analytics in your silverlight app. You can grab download the code or binaries here.
I think the code posted on Nikhil's blog is out of date if you are using ga.js and not urchin.js.
The use of the global function __utmSetVar() is replaced by the tracker method _setCustomVar()
http://code.google.com/apis/analytics/docs/gaJS/gaJSApiBasicConfiguration.html#_gat.GA_Tracker_._setCustomVar

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