I'm a fan of the Monokai colour scheme for my source code editing and thus set up it whenever I can in the IDEs I use.

For JetBrains' IntelliJ IDEA I use Long Cao's Monokai colour scheme. Grab the XML file and drop it, on Windows, in your %HOMEPATH%.IntelliJIdea11configcolors directory. Restart IDEA and the Monokai colour scheme ought to be present in the dropdown box under File » Settings » Editor » Colors & Fonts » Scheme Name.

You can enable support for certain forward version features via the android.support namespace. In order to accomplish this you need to start the Android SDK Manager and make sure that under the Extras heading you select and install the Android Support package.

Once done you go into the directory extras/android/support/v4 and copy the android-support-v4.jar to your own project's libs directory. Next go within IntelliJ IDEA to File » Project Structure and under Project Settings go to Modules, make sure your application is selected in the middle pane, then on the right side select the Dependencies tab. In the window below click the plus-icon and select Jars or directories. From the resulting window browse to your libs directory and select the android-support-v4.jar and press OK to close the window and add the jar-file to the dependencies of the project. Since you are now using certain constants from a newer version of Android the Module SDK needs to be changed to Android 4.0.3 Platform as well. Press Apply and close the Project Settings by pressing the OK button.