How to create an Odata service to update value in SAP

I am an android developer , it is my first time use the sap netweaver gateway to create an android application.

I use the netweaver gateway sdk to create a List/details Application.

I can get our backend server data .

Now I need to another service to update the data.But I do not know how to get it.

There are some screen shoots.

this is our sap netweaver gateway backend , I can get the data from BasicQueryCustomer by the sdk that is auto-generated.

Now I want to get the BasicDeltaCustomers data.

In the BasicQueryCustomer I can get all the data .BasicDeltaCustomers i can get the changed data .

At the end of the BasicQueryCustomer  data there is a delta token . It is used to get the BasicDeltaCustomers  data

this is the BasicDeltaCustomers

Regards

Thanks in advance