I've installed Android SDK like so:
sudo apt-get install android-sdk
Now what? How do I start anything? Searching for "Android" doesn't show anything in Gnome Activities. What did installing android-sdk even do if there's nothing to run? I do see adb at the command line, but that's all.
Old question, but whatever. I stumbled on the same problem and maybe someone can contribute to make it a bit better for whoever comes next.
The android-sdk manager does not give you anything to start from, if not the basic libraries and few tools to work with Android (like adb).
If you are at this point and don't know what's what, you might want to stop and read a bit more on how the Android development and ecosystem works: using Android Studio (the IDE based on IntellijIDEA) could be a good starting point.
The sdkmanager is (now) part of a different package and it doesn't seem to be shipped through the repos (I guess license issue? or they don't care to package it for debian/ubuntu). You need to download and install it separately from the official android website.
The way I did it was switching into my directory:
android-studio/bin
Then running the following bash command:
./studio.sh
