emulator-5554 disconnected! Cancelling 'info.androidhive.slidingmenu.MainActivity activity launch'!

The problem as I discovered lays in the fact the the project has no appropriate Virtual Device defined for it in the AVD manager.

So the recommended steps in eclipse are:

1. Go to "Project"-> Properties-> Android.
2. On the right pane see what line is checked in the Project build target.
   Remember the target platform number that appears in the selected line.
3. Go to "Windows"-> AVD Manager.
4. Check the list of existing Android Virtual Devices for a device that matches the Platform and API level that you have set for your project (see step #2 above).
5. If there is no line that includes an AVD for your platform (as I suspect), add it using the "New" button.
6. A "Create New Android Virtual Device" window will be opened. set a new device name. in the "Target" selection box choose the right platform for your project.

--- OR ---

1. Open Android Virtual Device Manager
2. select the AVD you use for your app.
3. Press the start button and wait for a new form to show up called (Launch Options).
4. Check the box "Wipe user data" and hit "Launch" button.

This should work.

--- OR ---

1. Open Android Virtual Device Manager
2. Delete the AVD you use for your app.
3. Create an new AVD.
4. Start you new AVD.

This should also work.

-- OR --

try this.. go to DDMS perspective-->select Device-->go to Window-->Navigation-->Show view menu-->reset adb.. .

Enjoy your emulator once again!