I want to make a diagramming tool for my Android, BUT, I would want to wrote to an external file for saving and loading the diagrams. And so I can transfer/backup the file.
The tutorials say that appmobi and cocoonjs say they don't support ajax or XML.
Is this still the case or is there another option?
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In the newest beta, Ajax was fixed in cocoonjs.
I just noticed that last night!
Unfortunately, I'm not sure what I'd do with it.
Can I read and write to a simple text file on the device?
Construct 2 doesn't support writing files at the moment. Your best bet is either WebStorage or savegames.