Coming from Eclipse I now use Android Studio for development. In Eclipse it was always clear which files were not saved, but in Android studio I see no distinction between t
Check IntelliJ IDEA Q&A for Eclipse Users: http://www.jetbrains.com/idea/documentation/migration_faq.html
Q: How do I make sure all my files are saved?
A: Don't you worry. They are all saved automatically.
The link plastiv provided explains that files are auto saved. It does not (as far as I can see) answer your first question about distinguishing saved and unsaved file. To do that, you can go to Settings > [IDE Settings] > Editor > Editor Tabs and select the option "Mark modified tabs with asterisk".
UPDATE
In IDEA v14 and later, this setting is located on the Settings > Editor > General > Editor Tabs pane
File
>Settings
>Editor
>General
>Editor Tabs
> then checkMark modified tabs with asterisk
>OK
Now, you may also want to do this-
File
>Settings
>Keymap
> search with save document > right clickSave Document
>Add Keyboard Shortcut
> press Ctrl+S>OK
>Remove
>OK