What are the appropriate document/stage dimensions in Flash for tablet optimized apps?

Question

What are the appropriate document/stage dimensions in Flash (width x height in pixels) for tablet optimized apps?
(Dec. 2013)
Using Flash and AIR for Android/iOS I would like to develop a educational interactive title optimized for tablet PCs, hopefully both the Android but finally also the iOS platforms. With so many tablets on the market today and with different resolutions (and even aspect ratios) I have difficulty deciding what document/stage size to set for my project/app. I have been experimenting with an Android Google Nexus 7 and Samsung Note 10 tablets and discovered that Android automatically resizes the app's stage to fully fit the screen of the tablet BUT this creates the following two issues for me:
if the stage/document size in Flash is too small and I include bitmaps when the app's stage is enlarged to fit the tablet screen the bitmaps look pixelated.
If I make the stage dimensions too big so that there is no bitmap pixelation because the bitmaps will be shrank instead of enlarged, I am afraid that on some older tablets with slower processors the app may be too slow to run (but I have to say that I did not experiment with very large stage dimensions yet).
Until today I had looked at some of the most commonly used tablets on the market and their resolutions Google Nexus 7, Samsung Note, iPads etc and was inclined towards using a stage size of approximately 1280 x 720 pixels which I considered a medium solution, but now the new generation tablets came out (Nexus 7 gen 2, iPad Mini with Retina, iPad AIR etc) with much higher resolutions so I don't know what size to use now. Anybody has any suggestions?
I would appreciate any ideas and suggestions on this matter.

Answer 1

You explained your problem well enough that looking at the picture won't matter.  It looks like you found out too late that one of the first things you should do when you create a Flash file is set the movie properties, which include the dimensions and other things like background color, frame rate, publish settings, etc.  While the string that I just listed can pretty much be revised anytime, the dimensions should really be done before anything else, when possible.
One way to go about resizing is to leave the file as is and specify the larger dimensions in the html page code.  This could end up reducing the quality of any bitmaps you might have in the file(s) since you would essentially be enlarging them, but any Flash drawn elements will resize cleanly.
If you resize the stage, then you don't have much choice but to resize and relocate everything in it keyframe by keyframe.