I upgraded the Android ADT and SDK from 4.0 to 4.2, and found that the platform of the various API level listed in Eclipse's Android settings had disappeared and could not create a new Android project. And check that both the SDK and ADT are up-to-date.
The solution is to re-build a workspace (workspace). in Eclipse's Windows > Preferences > General > Startup Shutdown > Workspaces, remove the previous workspace and restart the EC Lispe (This causes the project to not see the previous, it is recommended that all projects be selected in the Package Explorer before remove and then exported as ' File System ' for later import).
After you re-enter Eclipse, look at the Android SDK location and you should be able to identify it. If not, rename the directory where your SDK resides, and then go to the Android category in Eclipse settings to point the SDK location to the path of the renamed directory. After the recognition is done, rename that directory back to the original, and then specify the path again in the settings.
A workaround for the SDK location is not recognized after Android upgrade ADT and SDK