How to install Android SDK without internet connection

The magic URL is:

http://dl-ssl.google.com/android/repository/repository.xml

That is the XML file from which the URL for downloading the SDK packages are obtained.

For e.g. if you want to download Mac version of Android SDK for version 2.0, you could look up that XML file. You will find a block under tag SDK 2.0 like this:

<sdk:archive arch="any" os="macosx"><sdk:size>74956356</sdk:size>
<sdk:checksum type="sha1">2a866d0870dbba18e0503cd41e5fae988a21b314</sdk:checksum>
<sdk:url>android-2.0_r01-macosx.zip</sdk:url></sdk:archive>

So the URL would be:

http://dl-ssl.google.com/android/repository/android-2.0_r01-macosx.zip