Solve one of the key application methods for Android Google map SDK-but the key cannot be properly displayed in Map

Because the project needs to use the Google map SDK to quickly develop the positioning and navigation functions of Android, there are many posts on the internet,

However, you cannot find the application location after you open http://code.google.com/android/maps-api-signup.html.

Last Huang Tian don't have heart, found the V1 version of the application page, this can be displayed, the link is ": https://developers.google.com/maps/documentation/android/v1/maps-api-signup? Hl = ZH-CN (remember to log on to your Google account first)

However, the map cannot be normally displayed (it is a small square). It should be version 2 that does not accept the key of version 1. Why ~