Trying to update Eclipse ADT - v 20.0.0 or above from v 18.x

Question

(I am using eclipse 3.7.1)

After manually downloading Jellybean API in tools/android (instead of via ADT in Eclipse), I am experiencing some odd behaviour in Eclipse.

The Android folder in Preferences is now no-longer-specifiable! Error: This Android SDK requires Android Developer Toolkit version 20.0.0 or above. Current version is 18.0.0.v201203301601-306762. Please update ADT to the latest version.

I then tried Install New Software, to grab this latest version. That does not work, with the following errors being displayed:

An error occurred while collecting items to be installed
session context was:(profile=SDKProfile, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
No repository found containing: osgi.bundle,org.eclipse.emf.common,2.7.0.v20120127-1122
No repository found containing: osgi.bundle,org.eclipse.emf.ecore,2.7.0.v20120127-1122
No repository found containing: osgi.bundle,org.eclipse.emf.ecore.change,2.7.1.v20120127-1122
No repository found containing: osgi.bundle,org.eclipse.emf.ecore.xmi,2.7.0.v20120127-1122
No repository found containing: osgi.bundle,org.eclipse.emf.edit,2.7.2.v20120130-0943
No repository found containing: osgi.bundle,org.eclipse.wst.common.frameworks,1.2.102.v201201190400
No repository found containing: osgi.bundle,org.eclipse.wst.common.project.facet.core,1.4.201.v201201101553
No repository found containing: osgi.bundle,org.eclipse.wst.validation,1.2.303.v201202090300

Eclipse can't handle Android anymore, and uninstalling the API isn't working..

Answer 1

Your Eclipse installation is missing the Eclipse Web Tools (which are used for the XML editing inside the ADT plugin). Installing them with older versions of Eclipse is described directly in the Android documentation .

If those links are not sufficient for you, then please add your used Eclipse version to the question, as the link for installing the Web Tools depends on that version.