You may receive this “emulator-xxxx disconnected” error when an emulator has been successfully launched. If you select Run, a new emulator will be started.
To avoid the waiting time, how can we reconnect to the running emulator?
Click Window->Open Perspective->Other, choose DDMS, the Devices View should be empty. Click the View Menu icon in the top right corner of Devices View and click reset adb.
The running emulator is connected now.