To build Google Map on Android must have API Key Google, Well, I would like to show how to get API Key Google.
First, Look for file "debug.keystore", you can get it in like below
Type for getting MD5 Hash "keytool -list -alias androiddebugkey -keystore <location debug.keystrore> -storepass android -keypass android"
look at screenshot below
Then access address "http://code.google.com/android/add-ons/google-apis/maps-apis/maps-api-signup.html"
After that, input your MD5 Hash, then press "Generate API Key". Look at below
The last,,,, Enjoy your API KEY.....!!!