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The good news if you want to understand the accelerometer is that the documentation on Adobe's site already provides some great examples. In fact, the initial portions of code for this tutorial are lifted straight from documentation which provides details on how to determine if the accelerometer is ...
AIR for Android (and thereby mobile Flex) has access to the same file API you are accustomed to in standard desktop AIR application programming. You can utilize this to create a local copy of the remote image and serve this up when offline or simply for faster display.
By default Flex Mobile does not include support for gestures but it turns out to be very easy to add. It's simply a matter of importing the class and adding listeners where necessary.
Utilizing the open source ZXing ActionScript project and updating some code originally posted by Michael B we can decode QR codes as viewed through using the Camera class.
Passing data on pushView() is easy since it takes a data property. However, popView and popToFirstView() do not, so it isn't quite so obvious. Nonetheless, once you know the solution, this turns out to be a very simple matter of overriding a method in the View being popped.