Posts Tagged ‘Image’

Send pictures from Android device to Windows with AIR applications

In this example I will show how you can take and send pictures from Android phone to Windows application using Adobe AIR in Android and Windows.

Create AIR for Android application (to take and send picture)

In Adobe AIR 2.5 there is Camera UI class that allows you to capture a still image or video using the default camera application on a device. First check that Camera is supported and create a new Camera UI object and register MediaEvent.COMPLETE to call onComplete function when picture is taken.

After that establish a new NetConnection for P2P in the local network (LAN). This can be done by specifying connection string as "rtmpf:" in NetConnection.

private function init():void {
  if (CameraUI.isSupported){
    myCam = new CameraUI();
    myCam.addEventListener(MediaEvent.COMPLETE, onComplete);
  }
  nc = new NetConnection();
  nc.addEventListener(NetStatusEvent.NET_STATUS, netStatus);
  nc.connect("rtmfp:");
}

When connection is made netStatus function will be called. If NetConnection is ok it is time to setup own group for multicasting. You can set up your own NetGroup with GroupSpecifier. Enable local connections between peers and set your IP address and port for multicasting. You can find more details about multitasking for example here: www.flashrealtime.com (Tom Krcha - thanks about your excellent demos and work with Flash based Technologies).

private function netStatus(event:NetStatusEvent):void {
  switch(event.info.code) {
    case "NetConnection.Connect.Success":
       var groupspec:GroupSpecifier = new GroupSpecifier("fi.ptm.imageApp/myChannel");
       groupspec.postingEnabled = true;
       groupspec.ipMulticastMemberUpdatesEnabled = true;
       groupspec.addIPMulticastAddress("225.225.0.1:30000");
       group = new NetGroup(nc,groupspec.groupspecWithAuthorizations());
       group.addEventListener(NetStatusEvent.NET_STATUS, netStatus);
       break;
  }
}

A new picture is taken when user presses Take Picture Button in device's screen. Picture is taken with Android Native Camera Application (using with Camera UI class) and onComplete will be called when picture is taken.

In this example image is shown with <mx:Image id="image"> and image URL is used when image is sent to Windows AIR application.

private function takePicture():void {
  image.filters = [];
  if (CameraUI.isSupported) myCam.launch(MediaType.IMAGE);
}

private function onComplete(evt:MediaEvent):void{
  image.source = evt.data.file.url;
  imageURL = evt.data.file.url;
}

Image is converted to ByteArray and all of those bytes is sent to Windows AIR application when user clicks send button in the devices screen.

private function sendPicture():void {
  var fs:FileStream = new FileStream();
  fs.open(new File(imageURL), FileMode.READ);
  var bytes:ByteArray = new ByteArray();
  fs.readBytes(bytes);
  fs.close();
  if (bytes == null) {
    trace("Image bytes is null!");
  } else {
    // create a new object with image data and image count (sent)
    var message:Object = new Object();
    message.bytes = bytes;
    message.images = ++imagesSent;
    group.post(message);
    trace("Pictures sent:"+imagesSent);
  }
}

Create AIR local client in Windows (receive images)

Windows AIR application is connected to same group and it is waiting for images from AIR for Android application. If we get a new netStatus with NetGroup.Posting.Notify message then a new image is received from Android. First new Sprite is created and all of those image bytes is loaded with Loader.

public function receivePicture(message:Object):void {
  imageContainer = new Sprite();
  var loaderContext:LoaderContext = new LoaderContext();
  loaderContext.allowCodeImport = false;
  var loader:Loader = new Loader();
  loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onPicLoaded,false,0,true);
  loader.loadBytes(message.bytes, loaderContext);
  // add a new sprite to hold image
  imageSprite = new Sprite();
  imageSprite.addChild(loader);
  imageContainer.addChild(imageSprite);
  wrapper.addChild(imageContainer);
}

ImageSprite is a wrapped for a new image sprite to get Parallel image animation into it (scaling, positioning and sizing) for 4 seconds.

private function onPicLoaded(e:Event):void {
  imageSprite.x = -imageContainer.width / 2;
  imageSprite.y = -imageContainer.height / 2;
  imageContainer.x += imageContainer.width / 2;
  imageContainer.y += imageContainer.height / 2;
  startX = imageContainer.width / 2;
  startY = imageContainer.height / 2;
  targetX = Math.floor(Math.random()*frame.width);
  var borderSize:uint = 100;
  if (targetX < borderSize) targetX = borderSize;
  if (targetX > (frame.width-borderSize)) targetX = frame.width - borderSize;
  targetY = Math.floor(Math.random()*frame.height);
  if (targetY < borderSize) targetY = borderSize;
  if (targetY > (frame.height-borderSize)) targetY = frame.height - borderSize;
  startRotation = Math.floor(Math.random()*360);
  if (Math.random() > .5) targetRotation = startRotation + 180;
  else targetRotation = startRotation - 180;
  imageAnimation.play();
}

Here is a basic parallel animation used to make a cool sliding effect with a new images. All previous taken images will be visible there too.

<mx:Parallel id="imageAnimation" target="{imageContainer}" >
  <mx:AnimateProperty property="scaleX" fromValue="1" toValue="0.2" duration="4000" />
  <mx:AnimateProperty property="scaleY" fromValue="1" toValue="0.2" duration="4000" />
  <mx:AnimateProperty property="x" fromValue="{startX}" toValue="{targetX}" duration="4000" />
  <mx:AnimateProperty property="y" fromValue="{startY}" toValue="{targetY}" duration="4000" />
  <mx:AnimateProperty property="rotation" fromValue="{startRotation}" toValue="{targetRotation}" duration="4000" />
</mx:Parallel>

Testing and source codes

You have to install Flex 4.1 (or newer) and AIR 2.5 SDK to try these examples (just copy/overwrite AIR SDK 2.5 to Flash Builder sdks/4.1.0 folder, or make copy from 4.1.0 to for example FlexAIR2.5 folder and overwrite there).

AIRSendingImageFromAndroid.zip
AIRReceiveImageFromAndroid.zip