how can I install SDK properly ive tried this but failed
Enter "Android Development Tools Plug-in" for the "Name." Enter "https://dl-ssl.google.com/android/eclipse/" for the "Location." This tells Eclipse what plug-in you are trying to install and where to download it from.
Click "OK." Although "https" is more secure, if you have trouble acquiring the plug-in, you can replace "https" with "http" in the "Location" URL.
Tick the check box you see next to "Developer Tools" in the "Available Software" window that appears. Click "Next" to see the list of tools that will be downloaded.
Accept the license agreement and click "Finish" to complete the installation. If a security warning telling you that "You are installing software that contains unsigned content" appears, you can safely click "OK."
Restart Eclipse and configure the ADT plug-in to find the Android SDK tools. Click on "Window," select "Preferences," select "Android" in the left panel and click "Browse" for the "SDK Location." Navigate to the Android SDK folder, click "Apply" and then "OK."