If you've run your app on your device from Processing then it will stay there and you can use it later. However, if you want to install on other devices or release it through the Android Market Place you'll need to do a bit more.
Currently you can't export signed apk files for the Android Market Place directly from Processing yet. But you can export all the files you need to create one. I'm still working on this, below are the directions I've been using. I will put it all together once I have confirmation that what I'm doing works on multiple devices.
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