I faced this problem when I was working with the Android Eclipse plugin and sometimes my application or the application changes would not show up on the emulator.
You might want to check out this link which Google has for the same problem. However in my case it was not helpful.
What worked in my case was killing the adb process. If you are using Ubuntu then goto System->Administration->System Monitor and hunt for the adb process, which would be sleeping. Kill the process and rerun your application.
On Windows you can go to the task manager and kill the adb process.

Ingeborg Minecci
Saturday, February 13, 2010
out some more
Andy
Saturday, March 20, 2010
Thank you so much! This was causing a real headache!
Killed ADB.exe *32, then told eclipse to run the app and it worked a charm! Thank you!
Craig
Tuesday, May 25, 2010
You know your stuff. Worked great. Forced quit the adb process on MAC. Reloaded the app, and it worked great
Arulg
Friday, March 25, 2011
Vikas!!, That was really a quick tip and awesome learning for me!. I kiled the process in mac and relaunched my app via eclipse. Boom app showed and worked
Chris
Thursday, May 12, 2011
Unfortunately this didn’t work for me, but what did was to delete the virtual device and then re-create it. Worth a try…
thoggy
Thursday, July 21, 2011
vikas thanks toooo much, you are great..:)) i was just about to die.. I think this is the worst problem ever for a beginner.:))
Vikas Hazrati
Sunday, July 31, 2011
Glad it helped, though it is from a really old version now
Rossis22
Monday, August 8, 2011
This is strange… I just downloaded all the latest (Eclipse, JDE, Android SDK, ADT) from all the official sources and I encountered the same problem on my XP SP3 box… What gives?
rahul
Wednesday, August 31, 2011
Thank you…solved my issue.
talha6k
Wednesday, October 5, 2011
Thanks!
Kavitha Prakash
Thursday, December 1, 2011
hi!
killing adb.exe even not load my changes into the emulator. what should I do?
raviteja50
Monday, January 16, 2012
Guys I am facing the similar problem since last 4 days but i figured it out what’s the problem is…
Solution is so simple if u guys have installed any firewall (My one is comodo firewall) it blocks the IDE communicating with the emulator once i uninstalled it works awesome…
Roco
Thursday, January 19, 2012
Hi,
this has not worked for me either.
I even deleted the virtual device restarted eclipse, everything. Just won’t load. Any other ideas?
Gon4arowww
Saturday, February 11, 2012
Thank you
vikasbandal
Saturday, February 18, 2012
Hello,
I am on Windows 7 + eclipse + android sdk.
New application icons or any updates in the eclipse project are not reflected in emulator.
killing the adb.exe or cleaning the project is not working.
Also deleting the old avd and creating the new avd also not working.
Help in this regard is highly appreciated.
Regards,
Vikas