I need to port my Qt app to Android, but I can't figure out even how to get started. I've installed the SDK and the NDK from the Ubuntu repository, and I'd like to compile anything (even if it's in Java) and run it on an Android simulator, before I tackle a Qt app. The next step, according to http://doc.qt.io/qtcreator/creator-d...g-android.html , is to run
Qt Code: 
  1. ./android update sdk
To copy to clipboard, switch view to plain text mode 
The page doesn't say what directory to run it in, or whether I have to be root. There are several files called "android". Where do I run it?