I integrated with zxing for barcode scanning to read ISBNs.
Because of this missing feature in Android I had to draft my own login dialog for users to enter their google account credentials.
Now for the frustrating part. How they setup the registration/entry process to the ADC means if I want my application available on the market, I have to repackage. This means changing the AndroidManifest.xml and refactoring all the code to have a new package structure. That doesn't seem so bad, right?