If Eclipse fails to recognize your running Android emulator (no visible emulator in the DDMS view for example), you might see an error message in the console window like this:

[2012-12-19 07:53:37 – adb] ADB server didn’t ACK
[2012-12-19 07:53:37 – adb] failed to start daemon

And you get an Adb Error dialog, saying:

Adb failed to restart!
Make sure the plugin is properly configured

Like pictured below:

eclipse does not detect android emulator - feilmelding etter trykket reset

You can solve this problem with the following steps:

  1. Open the windows task manager (Ctrl + shift+ escape)
  2. End/kill all adb.exe processes
  3. In Eclipse, while the Android emulator is running, go to DDMS -> Devices
    Click the down-arrow to see the menu, and click “reset adb” like pictured below
  4. Your emulator should now appear in the devices window again.

eclipse-does-not-detect-android-emulator

If this should not work, try restarting Eclipse and the emulator, and try the steps again.