I am working with the
Google Map Android API v2
What type of keystore you are using? there are two keys.
release key. If you use debug key and uploaded in android market, map will look blank. Use release key when you signed your apk.
Release key procedure
Say for example your apk name is A and you are signing and creating a keystore for A.apk ie A.keystore will be created in some drive location.Let's consider it in E drive.
Now locate to jdk in C drive(Considering for windows and assigning C drive)
C:\Program Files\Java\jdk1.7.0\bin>keytool -list -v -keystore E:\A.keystore -alias A
So it will create SHA-1 finger print.