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Google Cloud Endpoints - where the magic happens

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Google Cloud Endpoints is the key technology used in this codelab. It offers an extremely simple way to build server-side logic on Google App Engine, leveraging this platform's auto-scaling and high-availability.

Cloud Endpoints exposes standards based REST interfaces with built-in authorization and auto-generates strongly typed, and mobile optimized client libraries for Android, iOS and JavaScript. This is a fully supported service provided by the Google Cloud Platform with integration in Android Studio (see previous section).

In Java, using @Api, @ApiMethod and associated attributes enables you to decorate your business logic to expose it as RESTful APIs.

Here's a simple example :

@Api(name = "myApi", version = "v1")
public class MyEndpoint {

    @ApiMethod(name = "helloWorld")
    public String hello() {
        return "Hello World!";
    }

}

The following HTTP request will be mapped to a call to the above hello() method :

HTTP GET https://<project_id>.appspot.com/_ah/api/myApi/v1/helloWorld

Luckily, as we will see, the Endpoints technology comes with the ability to generate Android clients to avoid having to deal with HTTP request construction and json response parsing.

You'll find plenty of documentation for Google Cloud Endpoints here : https://developers.google.com/appengine/docs/java/endpoints/