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In the included LVL sample app, the license check is triggered during onCreate. This means that when I click “Buy App” to launch the market, then immediately hit the back button to return to the app, the dialog is gone and another check isn’t performed, leaving me with a perfectly usable app (at least until the activity is killed and the process starts over again).
Would triggering the license check during onResume() be bad form, even though it would fix this issue? Is there a better solution?
After further research (and some experience) it appears that using onCreate() to check the license is fine. If you’re sticking with the dialog method, adding finish() to the function that goes to the market will ensure that somebody can’t just “back” into the app from the market and use it normally. They’ll have to re-launch the app, which then triggers the license check again.