Develop Reference

Not getting any idea about the workflow of managing an android device from another device using an pre installed android in both devices

I have a new project at hand where I need to make two android applications
1)Main Controller application (be installed in one device say its name be X)
2)Sub Child application (be installed in devices that need to be controlled by X )
So I want to get an idea/picture about how one android device like (2) can be managed fully(i.e. blocking applications or making them accessible for some interval / block calls / track location of user ) from another device like (1). So far I searched Google ,asked my seniors about the same but none was able to help me out.Found many scattered info (like need enterprise app to do this i.e use android management API or Device admin ) but not being able to get any clear idea about the work flow.
Thus now this the last place I can think of for helping me out with this work flow.
Reference
Update: Based on what #Fred said i.e. to use android management API (also based on the answers that he posted here) could we somehow have own custom web server and manage the interactions that EMM console does with all the child apps through our own API's(the same API's which we would call from the parent app.) ???
In other words instead of controlling form the EMM console, I would like to control those child application from another parent android application.

By FCM or Socket programming you can easily communicate with other app. Suppose 2nd app receive a call then 2nd app call a api of server about the information, then server knock 1st app by fcm or socket, then 1st app make a decision and submit the decision to server by API, And finally server submit the decision to 2nd app by FCM or socket.

You can check out the Flyve MDM which is an open source mobile device management solution including both agent app and web panel for management.

Best way to manage ios and android applications simultaneously

When I build a web application, like most others, I simply build an admin area from which the client can control their site.
Most applications I build for android never require this kind of maintenance as they are all self contained. However Something I'm extremely curious about, say you build a cross platform application that does require constant maintenance; you've got 2 versions - an iOS and android version. What would be the best way to go about managing both applications from the same place?
For examples sake, let's say you build a real simple application. It could be something that once a day sends you a message, "hope you're day is going well" or "let me tell you a joke". Now what if those messages were hand typed and submitted to the applications, you want to log into a system, type the daily message in and both applications are simultaneously updated with the new message.
In my head I'm imagining you would need to build a dedicated admin system either as a web application or standalone desktop application that connects to the apps hosted database however I'm wondering about how well that would work, what kind of problems are you going to run Into, would it even be feesable?
I've never had to build something like this but some of the more recent web applications I've built would work well as straight forward applications and that just gets me thinking, if I was asked to turn them into apps that function the way they do already, what would be the best way?
It's something I'm really curious about and feel like I need to get my understanding on the right track.

I think you are describing an application for an admin that will set up (write) data to be used by users of Android and IOS apps. Few options:
Write the admin application as a regular web application. Be careful to use transactions in the code that writes to the database. That is to avoid inconsistent DB states when your admin applications DB writes interleave between mobile app reads. Also you have to secure the admin REST resources (API end points) for admin access only, so you would need authorization code in the app.
Write admin apps for the mobile platforms (or an admin section in the existing app that is properly authorized in the app code) and the server API end points. That is more tedious because of 2 platforms. Again you will need the DB transactions and authorization code
Write separate admin apps for mobile but with one framework (Xamarin). It will work for simple apps and yours sounds simple enough for Xamarin to work well.

Online Storage Android App

I am to build an android app that needs a central cloud storage (along with some server coding). My app is somewhat in the footsteps of
https://play.google.com/store/apps/details?id=com.justyo
I mean i should be able to store a login and registration (possibly FB login in the future too). Then, i will also have to maintain and fetch users' 'friends' in the app along with a status (that can be changed any time by the friends).
I am not new with android dev. I also know ample amount of web development. However, i don't know the approach to this kind of an app that is to use some server side code and online db for android.
I have search a lot on the internet and have found a bunch of stuff, but i am just not getting the confidence as to which approach is what i need here.
Is there something pre-built and given by Google themselves?
Do i have to by a domain, deploy a hidden (UI-less) web service and access it through the android app?
is there a free option out there by google?
Is there a sample demonstration android app out there?
I don't need the code or anything. I am just confused; afraid of starting off in the wrong direction. Please answer so it is easy to understand.
Thank you in advance :)

There is the Google Cloud Platform, specifically App Engine. You can read the Docs here.
You dont't need to register a domain to use the platform. Yes, you will need to deploy a (not necessary UI-less) web service to the cloud, accessed from the Android client through endpoints. Additionally, the service is free up to certain limits.
Sample apps are available for deployment once you create a project from here.

MDM workflow in Android

Can any one help me out how to do MDM Integration in Android from client and server prespective?
I want to do an enterprise application which having lock and wipe functionality. I have no any clue of workflow of MDM in Android.
Thanks.

Android Device Admin API will do both things what you want to do (lock/wipe device and even more). An example is given and also you can find this complete source code in your Android SDK directory.
Now as client server perspective:
You have to implement your task (lock and wipe) in your android application (in client, i.e. known as agent). Now your application should be capable to communicate with your server or vice-verse.
I am 100% agree with adamk as he said "Remote controlling your application remains exclusively your responsibility - the Android framework does not provide (or enforce) any solution for that."
And Android gives your this feature too, as adamk said to use C2DM, he was right but now C2DM is deprecated, and GCM has been introduced, “a service that helps developers send data from servers to their Android applications on Android devices.” The service can send a message of up to 4 kb to an application on an Android device, most often to tell the application to retrieve a larger set of data. GCM will now handle all queueing and delivery for messages to Android applications.
You should read how to use GCM, and you can find sample code too. Download GCM Android Library from SDK Manager
and check android-sdk/extras/google/GCM directory
After establishing successful communication between your agent and server, evaluate msg in agent sent by server and perform desire action (lock/ wipe). This is again up to you how you define your message payload and how you handle those payloads in agent application.
Here is an article about Android MDM.
Happy Coding :)

You can use DeviceAdmin to gain privileges for managing the Lock preferences and performing device wipe (among other stuff).
(The user must add your app as a device administrator beforehand)
Remote controlling your application remains exclusively your responsibility - the Android framework does not provide (or enforce) any solution for that.
You may want to consider using Google's C2DM API, which is a convenient push mechanism.

As mentioned in the above answer, DeviceAdmin API can help. If you are using an Android device, you might know about the Android Device Manager (the web-based version) which allows you to manage your device. Basically, you can track, locate, lock, and wipe your device, some of the basic features of an MDM solution. So, in coding (though I am not a coding expert), you need to get access to the Device Manager (I guess, using some listener codes, or notification access).
Apart from this, MDM allows creating policies and groups of users (which would be a part of the coding in the app itself), then pushing the command over the internet (or OTA) to the connected device.
MDM also allows managing Apps and Data on the device, for which, you need the app to get access to the internal as well as external device storage.
Hope this helps. Good luck creating your MDM software

Can you share any kind of information between a web app and a native android app?

Been researching it for a couple of days, and it seems quite impossible (though highly desired).
I'm Looking for a way to anonymously identify users on our website as they later on run our mobile apps (both iphone and android, actually). At the very basic level, I'd simply generate a UID when someone visits our site, plant a cookie on their device, and then retrieve it later when our app is run. This simple implementation seems to be impossible, because the apps don't get access to the same cookie-base as the browsers (which makes sense, privacy-wise).
Also thought about using HTML5 for this purpose, which doesn't seem to provide any solution.
I Tried going the other way around and using the device id as identifier. However, seems like device id won't be available to the web server when someone visits our site.
There seems to be a perfect disconnect between data accessible from the browser, and accessible from the device itself in native apps.
Has anyone ever found a solution for this scenario?

As of my experience what you seek is almost impossible to achieve for a third party developer.
As you mention, the web browser - by default - doesn't have file-system access from the javascript context (which is where your web app will most likely run) and the cookies infrastructure isn't exposed to the application context.
What you could do is to write a plugin to the browser which might enable this one way or another. But then there is the technicality that the browsers on mobile devices usually don't support plugins and even if they did; you can't force your web app users to install the plugin :-(
Yet another, and if possible even more unlikely solution would be to try to influence the device browser project (WebKit or whatever project you wish to target) community to implement the functionality for you (good luck) :-)
A third solution and perhaps even the ethically more correct one would be to allow the user to identify him/her self optionally when using your device client application. Your client iPhone/Android application would then have a "Identify me as a client user"-button. This would of course require you to allow the user to choose a key (an e-mail address?) of his/her own when entering the web app. You'd likely need to store the key on the web server opposed to the client browser cookies.
Hope this gives you some further ideas.
Cheers

Here are some things I think would work (untested):
You can check if the user has a google account login in the browser and on the phone.
Another way would be to have them log in in both apps
Register a special url-handler which opens your android-app with an user-identifier which gets called by the webapp (see this question)
Edit: I over-read the IPhone part - #1 and #3 those answers are Android only (I think).