I have just developed a simple android application. As this is my first 
project I created a simple activity which has few text fields where a user 
can enter their values.

Now I want to add google app engine (gae) support so that I can save these 
values to the gae DataStore. so I read about how to do this.

   1. 
   
   First thing I did is to RightClick on my android project & select google 
   -> Generate App engine backend. This generated a few new classes for me in 
   my application package as I can see - - CloudEndpointsUtil.java - 
   GCMIntentService.java - RegisterActivity.java
   2. 
   
   It also generated the below classes in the folder: 
   
endpoint-libs\libdeviceinfoendpoint-v1\deviceinfoendpoint\deviceinfoendpoint-v1-generated-source
 
   package: com.xxx.deviceinfoendpoint - Deviceinfoendpoint.java - 
   DeviceinfoendpointRequest.java - DeviceinfoendpointRequestInitializer.java
   3. 
   
   It also generated the below classes in the folder: 
   
endpoint-libs\libmessageEndpoint-v1\messageEndpoint\messageendpoint-v1-generated-source
 
   package: com.xxx.messageEndpoint - MessageEndpoint.java - 
   MessageEndpointRequest.java - MessageEndpointRequestInitializer.java 
   package: com.xxx.messageEndpoint.model - CollectionResponseMessageData.java 
   - Key.java - MessageData.java
   
Now, my confusion is that I am kind of not able to join all the dots 
clearly. What I am trying to do is simple: take text values from screen & 
save them in the DataStore on the gae. My confusion is that has gae created 
this framework for me (above generated classes) which I can use to save my 
code. As I read we first need to create Entities, then add property/values 
to them and finally save that in DataStore.

So do I have to use the above classes to save my information that I can get 
from my GUI or do I need to write my entity code somewhere in these classes 
that have been generated for me.

I am currently working on Dev App engine server and have - 1. Changed 
LOCAL_ANDROID_RUN in CloudEndpointsUtil to true. 2. Gave PROJECT_NUMBER to 
random number "100" in GCMIntentService.

Also do I really need to use RegisterActivity in my MainActivity onCreate 
for what I am trying to do.

Any pointers will be really helpful. Thanks!

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