Android Emulator starts but Eclipse doesn't recognize it.

Android Emulator starts but Eclipse doesn't recognize it.

Solutions

1. Restart Emulator
2. Restart/Reset ADB

First, Restart Emulator is very painful and time consuming process.
Second, Reset ADB is fast and easy solution which does not require to restart emulator.

How to Rest ADB ?
1. Open Devices window from Eclipse Windows->Show Views->Devices
2. Click on down arrow and select Reset ADB.