你應該確保SDK是在Eclipse的喜好配置
Configuring the ADT Plugin
After you've successfully downloaded the ADT as described above,
the next step is to modify your ADT preferences in Eclipse to point to the
Android SDK directory:
Select Window > Preferences... to open the Preferences panel (Mac OS X:
Eclipse > Preferences).
Select Android from the left panel.
You may see a dialog asking whether you want to send usage statistics to Google.
If so, make your choice and click Proceed. You cannot continue with this
procedure
until you click Proceed.
For the SDK Location in the main panel, click Browse... and locate your
downloaded SDK directory. Click Apply, then OK.
Done! If you haven't encountered any problems, then the installation is complete.
If you're installing the Android SDK for the first time, return to Installing
the SDK to
complete your setup.*emphasized text*