I am getting started with Android Development and having trouble to get the suggestion box/intellisense to work in XML layouts.
I read number of articles suggesting to update the content assist settings for “Other Java Proposals” but there is no option for that.

So, currently I do not have any suggestions popping up in my layout pages.
Try opening your XML file with
Android Common XML Editorrather than opening it as just anXML File.As for Ctrl + space, follow this question:
Ctrl-Space in Eclipse without Pressing Ctrl-Space