I tried following a tutorial on Android Maps V2 Quick Start But when I run the app, a blank map screen is shown. My phone uses android 2.2.1.
I had the same problem but solved it like that. Might be helpful if the above answer doesn't work for you. After I changed my app's package name, map starts not to show up. (it happened after I changed my package name)
That worked for me
I finally found out what the problem was. I was picking the wrong debug keystore. I am working with an ubuntu machine. Since I opened eclipse as root, the default keystore in eclipse was located in my root folder(/root/.android/.android/debug.keystore) whiles I was creating the api key with the debug keystore from my user folder. I created a new api key with the debug keystore in the root folder and it works now.
I was mucking around with this stuff for ages as well (certificates, package names, API console etc.) and nothing worked until I tried uninstalling the app from my device, then re-installing it and suddenly it was fine.
make sure that you enable the Google Maps Android API v2 service in the https://code.google.com/apis/console
Then you're good to go :)
I had the same issue and the solution was to delete the debug.keystore. Then i did an
adb uninstall com.example.myapp
Then clean and run the application again.
I think the problem was due to the fact that i copied and pasted in my manifest a dummy API key and I first deployed the application with it.