Ozeki VoIP SIP SDK provides all the background for mobile platform and VoIP
integration. This article is a brief introduction about creating a VoIP client for Android
using the remarkable support of Ozeki VoIP SIP SDK. After reading through this page you will
be fully familiar with all the essential terms concerning Android VoIP clients
and what you will need for creating your own solution using Ozeki VoIP SIP SDK.
Google Android is today one of the most widespread mobile operating systems among
users. It can be found on cell phones and tablet PC devices, too. These mobile devices
are used not only for the traditional telephoning purposes nowadays but
all are capable of Internet connection and some of them also have mobile
Figure 1 - Android VoIP Client Solutions
When the Internet connection is an option, VoIP technology comes in quickly as
an alternative for communication purposes. VoIP is reliable, more flexible, serves
more purposes and at last but not least it is cheaper than using the mobile or PSTN
network for telephoning.
Android mobile devices have support for the Adobe Air environment that can be used
for building VoIP client applications with Ozeki VoIP SIP SDK (Figure 1). These
solutions can be made as easily as any other desktop applications, you only need to use a slightly different
programming environment and tools.
With Ozeki VoIP SIP SDK and Adobe Flash Builder you can create your own Android application
with standard programming techniques. You can upload these applications onto your
smart phone or tablet and use them for communication.
The following code explanation covers the basic changes in the Flash webphone program codes. You will
notice that the source code is very similar to the Flash webphone solutions. Therefore
if you have studied those codes, this will be easy to understand and the other parts of the
example programs will be familiar.
The server code of the mobile examples is the very same as in the case of the webphone examples,
therefore this article does not contain explanation for those. If you want to check the
server code, please visit the following pages:
The above mentioned pages also cover a detailed explanation of the client-side
implementations. The following section will introduce the code snippets that
are new in the mobile applications. These are basically the ones that
handle the physical buttons and the rotation features of the mobile devices.
When creating a mobile application, you need to use the File->New->Flex Mobile Project option
and set the project name, the target platform (Android, iPhone or BlackBerry)
The following program code (Code 1) shows how you can handle the physical buttons of a mobile device.
These instructions should be placed in the creationComplete handler of the application.
Code 1 - Handling the physical buttons of the device
In Code 2 the event handler functions for handling buttons are listed. You can see that
there is no difficulty to handle these buttons within the Adobe Flash code.
private function handleActivate(event:Event):void
NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.KEEP_AWAKE;
private function handleDeactivate(event:Event):void
private function handleKeys(event:KeyboardEvent):void
if(event.keyCode == Keyboard.BACK)
Code 2 - The event handlers for the device buttons
You can distinguish between the horizontal and vertical layout of the mobile devices, too.
If the layout needs to be rearranged when the device is rotated, you can do that by defining
states in your application and change these states when the device is rotated (Code 3).
Basically these were the functions and instructions that are needed to add in the mobile code
but above these the program is the same as the web solutions.
When the programming state is over, you can easily save the code in the proper file format by
using the File->Export menu option where you can specify target platform and for example get an
.apk file for the Android devices.
This article introduced you how to make Android VoIP client
solutions and showed how Ozeki VoIP SIP SDK can help you to fulfill your goals. If you have read through this page carefully, you already have
all the knowledge you need to start your own solution.
As you are now familiar with all the terms concerning this topic, now it is time
to take a step further and explore what other extraordinary solution Ozeki VoIP SIP SDK can provide to you.