Trouble installing ADT [closed]

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Error in Eclipse:

Cannot complete the install because of a conflicting dependency.

Software being installed: Android Development Tools 12.0.0.v201106281929-138431 (com.android.ide.eclipse.adt.feature.group 12.开发者_运维技巧0.0.v201106281929-138431)

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Conflicting dependency error means that you have installed some / all the packages for this Eclipse plugin (ADT is an Eclipse plugin) in the past and you are trying to install it again from different source (like from a downloaded file instead from the update urls).
All you have to do is:
Delete the Plugin - in eclipse, go to the upper application bar -> Help -> Install New Software.
Then, the Available Software will appear, and you will see at the bottom right corner a link named "What is already installed", click it.
When the Eclipse Installation Details window will appear, go to the "Installed Software" tab and mark all the plugins under Android and select "Uninstall" button.
Install the new one - now you can install the plugin from whatever you choose (it's more recommended to install it via the given URL from Android installation tutorial) without encounting Conflicting dependency errors.

good day!