Failed to load map. Error contacting Google servers. This is probably an authentication issue

搞个google地图，搞了一天，按照官网的一句一句的打，结果没显示出来，运行的时候，logcat里输出这句：

Failed to load map. Error contacting Google servers. This is probably an authentication issue (but could be due to network errors).

后面终于发现了，原来真的是验证的问题，我使用的是打包apk的时候的SHA1 去生成的map key ,所以我在调试的时候直接点击运行于真机设备，是不支持这个key的。解决方法是，把应用打包好，再放到真机上运行，才是可行的。至于测试的时候，就要用系统生成一个default.keystore，再去申请一个key，才能运行于调试环境。希望能帮助到大家

参考于此：http://stackoverflow.com/questions/17667935/failed-to-load-map-error-contacting-google-servers-this-is-probably-an-authent

Solution:

I found the solution!!!

If you use private keystore to apply API_KEY. You cannot upload and install application with eclipse.

You need to upload .apk file to your device by yourself and install it!

Thanks Tarsem and srikanth gr help!!