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how to secure android and angularJS using REST API services spring boot backend

I have a project, angularjs webapp (backend java and spring boot) and uses google map too, there is an android app that sends alerts to this webapp and those show location on the webapp’s map. However when I implement spring security it would secure the webapp and REST api, but will prevent the alerts from android showing on the map (can not find resource)….
I want an easy simple way to secure the app without stopping the REST API services, yes I want to secure my API but still want to be able to show the alerts sent from android device, also still accepts new registration from android users....(android users cant access webapp they only register to use android app and will be added to database..they will need to be able to post their info...)
I tried oauth2 using google sing in, but I must be missing something as it wont load,..If you think this is the right approach please confirm...I will further look into it...Or direct me to tutorial or give me any suggestions...
P.S I am using bluemix platform as a service at the moment and CLearDB database service from bluemix
I am a student and all this is new to me...Thanks

Developing both Rails Web App and Android App that shares only one Database

I'm a 3rd year BSIT student who wants to pursue a career of Web Development in the near future. We decided for our thesis to make a Web App about a certain topic using Ruby on Rails since it's the tool that we used during our WebDev class. I've had several experiences and accomplished projects using RoR thanks to the help of this site.
Our Adviser suddenly suggested us to make an Android version of the app for the customer's side to utilize it's portability. what we would like to happen is the Customers can input and retrieve data through that android app from a database, on the other hand, the admin can also do the same using a Desktop Web App utilizing also the the same database used by the customers.
Is there any other recommendations of lightweight development and database tools that can help us make the desired Web App beside Android Studio and Eclipse? Much better if it can support Rails or Ruby.
Note: Also, we're planning to include a GPS feature where you can locate certain shops using the said android app

What you are looking for is an API. You have a Rails app, now you have to expose API endpoints from your Rails App which your Android App can access and send requests to.
I don't know if you learned about APIs yet but in short, you set up new links that retrieve information from the parameters and respond using either JSON or XML. Your android app will for example have a login form:
Name = john
Password = anything
When they submit the form, you take the name and password and send it using an HTTP request from Android to your Rails App.
#stupid example but this is how the link would somehow look like
http://www.your-site.com/api/login?name=john&password=anything
Your rails app should be setup to receive request via an API controller:
class ApiController < ApplicationController
def login
#authenticate user
#respond with json
end
end
Your Android app receives a JSON response from Rails, usually a status code telling Android that the authentication was successful or failed and then you have access to your Web App using Android but nothing is secure and you will have to setup tokens for each request, etc because API's don't have sessions like a browser. But since you are talking about a school project and not a production app maybe you can ignore the security part.
Read this blog post on how to build an API:
https://labs.kollegorna.se/blog/2015/04/build-an-api-now/

Consuming generated google endpoint api jar in android client

I have a server backend endpoint written in java and have successfully implemented the generated client code in iOS but trying to make sense of how I can implement or consume the generated code in the android studio for the backend endpoint? I see google documentation for generating client for android and on same page shows step no.5 where it says add the generated jar to the android studio to consume endpoints from android , but how you consume the api? i see examples from google where it shows only google endpoint written in android and consumed in android also, where is the documentation or sample to follow consuming a server endpoint generated code from server project to client in android.
I have seen lots of threads but i don't seem to find any single step by step documentation where you can follow it or implement it.

How to access app engine datastore by android app?

I have created app engine app (using Python)(devappdemo.appspot.com).
Now i want to create an android app for the same which should access the same datastore.
I googled it and i found that it can be done with CloudEndPoints but dont know from where to start how it can be done. Please suggest any tutorials or step by step instructions to do it.

Google Cloud Endpoints would be the easiest way at the moment to get started with it. Here is the overview and tutorial.
Cloud Endpoints will help you generate the Endpoint API (REST API) and it also helps to generate the Android client code, that you can easily integrate into your Android application.
If you already have exposed your Python application over Web Services, you could directly use that from your Android application.

Integrate Appcelerator Cloud Services to a custom website made with ASP.NET

I'm really new to mobile world, so I'd like to get some opinion from experienced people.
After several days searching over the internet, I'm wondering if it's possible
integrate Appcelerator Cloud Services to a custom website made with ASP.NET, for example.
Although my mobile application, built with Titanium, it's linked to ACS, and works fine, I don't know if
it's possible to manage data stored in ACS from a custom website. To clarify, in one point there is my mobile application
talks to a webserver (ACS, for example) and other point there is a website, to manage the data stored in ACS.
What do you think, someone achieved this?
Or is it preferable to write a webserver from the scratch, store my data in somewhere, and forget about ACS?
Thank you.

Appcelerator says
Appcelerator Cloud Services (ACS) is a Mobile Backend as a Service
(MBaaS), offering a fast and easy way to build connected mobile apps.
Choose from a library of services such as push notification, status
updates, photo storage, and social integration, or create your own
custom cloud services.
Here in this page - Getting Started: Using the Javascript SDK - you can see how we can use javascript SDK which lets you access the Appcelerator Cloud Services server through some simple to use JavaScript calls. You can use this to develop web-based app.

ACS has a REST API which you can access through anything that supports xhr (which .NET does). For instance, to create a new user in ACS, you use the following link:
https://api.cloud.appcelerator.com/v1/users/create.json?key=YOUR APP APP KEY?email=john.smith#company.com&role=teacher
There are other properties you can tag onto the querystring to create a new user from a REST call. They have a complete API using REST. It's all documented. You can even send push notifications to devices from your custom website using the REST API! It's pretty cool.
http://cloud.appcelerator.com/docs/api/v1/users/create#rest
Good luck!