Earlier today, after SDK and Eclipse updates were installed, all of my Android projects got Red exclamation marks in project list and nothing compiled, Eclipse IDE was slow like hell and I got a lot of error messages – different exceptions, errors, etc. I did everything to repair my installations, including physically deleting all the folders from the drive. Nothing helped.

Than I got an idea – I’ve killed Eclipse, ADB and instances of Java and javaw in the Task manager and than renamed my c:\users\\workspace to workspace.old. After starting Eclipse next time it welcomed me with nice working IDE and Setup wizard for the ADT plugin integration. I’ve completed the setup, restarted Eclipse, installed my usual SDK versions in the Android SDK manager.

Than I’ve copied my folders back to new workspace folder, imported them and fixed them (it was necessary probably due to the SDK update, as I kept getting error

[2012-04-12 16:31:35 - SDFree] Android requires compiler compliance level 5.0 or 6.0. Found '1.4' instead. Please use Android Tools > Fix Project Properties.
for every project imported)

Eclipse, the Developement IDE

Here are the steps to resurrect Eclipse+ADT:

• quit all instances of Eclipse, java and Android SDK tools (kill them in the Task manager, if necessary – including ADB.exe)
• uninstall Android SDK
• delete c:\program files\android (or where SDK was installed
• delete Eclipse folder from c:\program files (or where you have installed it)
• locate your profile on disk – open Windows Explorer and open address %username%
• rename workspace to workspace.old (or simply move it somewhere else – careful: this folder contains ALL YOUR PROJECTS – so never delete it!
• install Eclipse classic from http://www.eclipse.org/downloads/ (choose either 32bit or 64bit version, depending of kind of Windows installed)
• download Android SDK from http://developer.android.com/sdk/index.html - choose EXE installer and install it (it will check for Java SDK installed, I assume that you already have it)
• start SDK Manager (in Widows 7 just click Start and type SDK Manager and press ENTER
• in SDK manager – select SDKs you want to download and install them
• start Eclipse
• Help->Install New Software->Add->Name: ADT Plugin, url: http://dl-ssl.google.com/android/eclipse/
• after the repository is loaded, select Developer tools checkbox and install.
• restart Eclipse
• Choose SDK location and browse for SDK folder location (probably c:\program files \android, or c:\program files (x86)\android under x64 Windows)
• This should be probably it for the installation part
• now import folders with projects back:
• copy folders with projects from root of workspace.old to workspace folder
• Eclipse->Import->Existing projects into workspace->Browse-Finish, do this for every folder (=project)
• for each imported project click right button on the project name in the Package Explorer and choose Android tools->Fix project properties
• Do this for each project you want to keep in the workspace

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Thank you, currently unemployed programmer Kokesh