Archive for the ‘Merapi’ Category

Android AIR Bridge

This is a quick demonstration of the Android AIR Bridge I have developed. The bridge works using socket communications together with AMF serialisation/de-serialisation. It builds on and adapts projects such as MerapiBlazeDSGraniteDSApache Commons and Apache Harmony.

I believe this opens up all functionality on Android to AIR applications and in fact allows you to develop fully mixed Android and AIR applications.

The demo video above showcases this two-way communication between Adobe AIR and the Android Voice Recognition functionality using the Motorola Xoom.

A button click on the AIR side results in the Voice Recognition service being activated on the Android side. The result from the Voice Recognition gets passed back into AIR which then uses it to make a remote service which allows me to create an intelligent response and play it back as audio.

If you want to get started with developing mixed AIR / Android applications then a great place to start is this superb article by James Ward on Extending AIR for Android . In this article he concludes that adapting the Merapi project to work with Android would provide a better bridging mechanism.

I thought that getting that working would be an interesting garage build challenge and that is what you see working in this demo. For any of you interested in experimenting with or using it,  the code for the bridge is now available to check out at


Lego Mindstorm Flex AIR2

This is something I dreamt up and actually finished in July but haven’t yet had time to write up a post on it. The original idea was to use Flex/AIR on the desktop to control a NXT Lego Mindstorm robot but then things got a little more ambitious by adding a bit of Augmented Reality together with real time Speech Generation.

The first step was to replace the firmware on the Mindstorm brick with LeJOS, which includes a Java Virtual Machine that allows the Mindstorm to be programmed in Java. This was a tense moment but actually went relatively smoothly.

I then created a Java application on my Macbook Pro that could control the robot via a Bluetooth link. I discovered that there is a nice little library called icommand that is designed to allow you to do just this.

Once I had that connection up and running the next step was to make sure that I could use this application as a bridge to control the Robot from an AIR application.

I therefore created an interface to my desktop Java application using Merapi, which is the same Java/AIR bridge that I used to create a previous project for Flex speech recognition.

Using this, I then created an AIR application that could send and receive Merapi messages across the bridge, which allowed to me to get sensor information back from the Mindstorm and to send messages to it for navigation and pincer/sensor control.

Having got all that working I couldn’t resist putting in some Augmented Reality, so I added an iphone to the Robot and used that as a wireless webcam to get the video feed into my AIR application.

I then adapted and incorporated my previous augmented reality projects to allow me to have interactive avatars that I could switch at runtime. These are integrated with a remote java server using BlazeDS to give me the artificial intelligence part that they need to provide realistic answers and speech.

Now around this time AIR 2 was released so I decided to create the whole thing using that instead. Instead of having separate AIR and Java Applications the whole lot is bundled together and deployed as a Native Application. This is very cool and I think adds a whole new dimension to what can be done with AIR. What actually happens is that the Air application contains on its source path, the executable java jar file for the Minstorm’s controller. Once the AIR2 application is launched it is able to launch the java application as a native process and then communicate with it across the bridge using Merapi by serialising objects between Java and ActionScript.

Merapi AIR/Java Speech Recognition and Voice Control

While I have been playing around with Merapi to add voice recognition for the talking head, I created a little Merapi application that allows me to move a target on the screen by saying the voice commands LEFT, RIGHT, MIDDLE.

I have seen Rich Tretola’s blog Everything Flex on text to speech through Merapi and thought it would make sense to do it the other way around. In other words, voice recognition and voice control.

This is fairly simple to achieve. I decided to use the Sphinx 4 Speech Recognizer which is an open source java project by Carnegie Mellon University and others.

I then wrote a client for that framework, added the merapi jar files and broadcast a merapi message whenever the Sphinx Client detected speech.

You can download the full source code by clicking here.