I think you will find that your users will demand you allow them to
store your app on the SD card, if this is possible with your app
anyway. Users will download apps until they fill them up, then will
want more. That's just human nature. If you can save them a couple
megs by moving your app to SD card, they will keep your app, otherwise
it will be uninstalled.

As for null checking, the specific instance for me was checking a
location provider that had been switched off by the user. Perhaps in
previous versions this resulting in a non-null value but in Froyo it
caused a crash. The simple answer was to check for null first. Bad
programming on my part, corrected for Froyo.

You can leave your old launcher icons in the drawable sub directory,
they will still be used by 1.5 apps. If you add the new resolution
drawable sub directories, along with new launcher icons, the 1.6+
devices will recognize them and act accordingly. It only takes a few
minutes to update them, the new styles are easier to build then the
old, tilted design. Your choice though.

-John Coryat

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