Since currently engaged in Android development work, so upgrade the next Android SDK and Eclipse ADT Plugin
First, update ADT
1. Open help->Install New software in Eclipse.
2. In the Details panel, click on the "What is already installed?" link.
3. In the Eclipse installation Details dialog box, select "Android DDMS" and "Android development Tools", then click Uninstall.
4. In the next window, confirm the ADT you want to delete and click Finish to delete it.
5. Restart Eclipse.
6, the next step, and re-install ADT the same, but those links have already, these people should all pro ...
The 3rd step down you can also not Uninstall, but choose Update. The version of 10.0.1 will be detected after a while (this step depends on your speed and whether the link you added before installing ADT is OK.) )
After detection, select Install directly, he will prompt you to install ADT, you can ignore him, directly click Next, and then he will restart Eclipse, so that the work is done.
Second, update SDK
       You can choose window->android SDK and AVD manager->installed packages->available Packages,  
The page then displays the available SDK versions that were detected, I selected all the items, and then installed them.
Work is done!
Upgrading Android ADT and SDK