Using Google Datastore for your Android app

Using Google Datastore for Android apps

Gaurang Kanvinde([email protected])

An example of how Google Datastore was used for DrawTyme

(http://drawty.me/ua44g)

+

22-Mar-2014 2©2014 DrawTyme Technologies Pvt. Ltd., All rights reserved

Overview of Google Datastore

• Non-relational database• Cloud based• Ready to use• Requires Google App Engine and Google Endpoints

– Very inexpensive and simple to use– Can be programmed in many languages – Java, Python, etc– Extensive documentation available


The Development Environment

• Eclipse for Java EE - Download and install• Google Plugin for Eclipse – Instructions to install

https://developers.google.com/eclipse/docs/getting_started

https://developers.google.com/eclipse/docs/getting_started


Setting up Google App Engine

• Create a project on Google App Engine - Link to Console• Remember it’s Project-ID

https://cloud.google.com/console


The nuts and bolts

• Two main directories– src

• Contains all the code of the app– war

• Contains a sub-directory named WEB-INF– Contains the compiled binaries of the code in “src”– Contains other dependencies– Everything else that goes into the app

• Contents of this directory will be deployed to the Google App Engine– index.html (if any, will go here)

• Code available at: DrawTymeExample.zip

http://www.drawtyme.com/DrawTymeBackendExample.zip


Understanding the code

• The Video class


Writing the API

• Defining the API class with @Api annotation


Writing the API

• Adding authenticated methods


Writing the API

• Adding unauthenticated methods


Preparing to Deploy

• Write app-ID of your project in war/WEB-INF/appengine-web.xml


Setting up Datastore Indexes

• war/WEB-INF/datastore-indexes.xml– If you get the contents of this file wrong, Google App Engine suggests

the correct content for you!


A quick peek at the Web-app

• war/js/backend.js– Initialising the API


A quick peek at the Web-app

• war/js/backend.js– Calling API functions


Deploying to App Engine

• Use Google Plugin button– Deploy to App Engine– Sign-in to the App Engine is required


It works!


Porting to Android

• AppEngine SDK has all the tools!– Use endpoints.cmd or endpoints.sh

• Eg: $PATH_TO_SDK/bin/endpoints.cmd get-client-lib \ com.example.api.classname

– Android code will be generated and stored in myapi-v1-java.zip


Locating the Android code for Endpoints


And we are done!

• Have fun using Google App Engine!

• Contact [email protected]: @gaurangrk

• DrawTymehttp://www.drawtyme.comTwitter: @drawtymeFacebook: https://www.facebook.com/drawtymeBlog: http://blog.drawtyme.com

mailto:[email protected]

http://www.drawtyme.com/

https://www.facebook.com/drawtyme

http://blog.drawtyme.com/

Using Google Datastore for your Android app

Technology

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