Try this solution and it worked. this problem is caused because ADB is unable to connect to the android servers to fetch updates. (If at home try turning off firewall)
- Goto Android SDK Manager
c://android-sdk-windows/ open
SDK-Manager - Click Settings – Will be
asked for a proxy. - If have one enter
the IP address and the port number.
If not turn off your firewall. - Check
“Force https://… ” (to force SDK Manager to usehttp
, nothttps
)
This should work immediately.