Android Development - Session 5

1. Session 5

2.  Why networks are very important?

3.  A Web service is a method of communications
between two electronic devices over the World Wide
Web. It is a software function provided at a network
address over the web with the service always on as in
the concept of utility computing.

4.  There are a number of web services that use markup
languages:
 JSON-RPC
 JSON-WSP
 Web template
 Web Services Description Language (WSDL) from the W3C
 XML Interface for Network Services (XINS) provides a POX-
style Web service specification format
 Web Services Conversation Language (WSCL)
 Web Services Flow Language (WSFL) (superseded by BPEL)
 WS-MetadataExchange
 Representational state transfer (REST) versus remote
procedure call (RPC)
 XML-RPC - XML - Remote Procedure Call

5.  Communication.
 Direct and Indirect.

6.  Database errors.
 Network errors.

7.  JavaScript Object Notation

8.  JSON Value
 Key
 Value
 String
 Number
 Boolean
 JSON Object
 List of JSON Values
 JSON Array
 List of JSON Objects

9.  Create database.
 Add some values in it.
 Create webservice.

10.  In computer science, a thread of execution is the
smallest sequence of programmed instructions that
can be managed independently by an operating
system scheduler.

11.  AsyncTask enables proper and easy use of the UI thread.
This class allows to perform background operations and
publish results on the UI thread without having to
manipulate threads and/or handlers.
 AsyncTask is designed to be a helper class around Thread
and Handler and does not constitute a generic threading
framework. AsyncTasks should ideally be used for short
operations (a few seconds at the most.) If you need to keep
threads running for long periods of time, it is highly
recommended you use the various APIs provided by the
java.util.concurrent pacakge such as Executor,
ThreadPoolExecutor and FutureTask.