If you're new to Android development, you will learn that, for each image resource you want to use (for a button for example), you need to provide it scaled to fit all screen resolution. A little bit complicated in fact.
So, take this online tool. It will ask your to which screen your image fits and then adapt it to all other.
In the last installation of STS I made, when I had the support of SVN by installing Subversive (from Menu > Help > Install New Software), Eclipse (Kepler) didn't ask me for the SVN connector I wanted to use. In this kind of situation, I discovered that it's possible to install it from an update site provided by Polarion.
So, go to to Polarion, and check out the url from the Download section. Here is the one I used :