7. Solve the Problem of Google SDK update failure.

Problem:

After Google was recently walled, the update SDK always failed, prompting Download interrupted: Connection to https://dl-ssl.google.com refused (Download interrupted, Connection was rejected ).

Solution:

Open SDK Manager> Tools> Options and select Force https ://... Sources to be fetched using http ://...", That is, the http protocol is forcibly used.

In the C: \ Windows \ system32 \ drivers \ etc directory for WINDOWS, open the host file and add the following content:
203.208.46.146 dl.google.com
203.208.46.146 dl-ssl.google.com

Resolve the domain name to the ip address that can access Google sdk.