I'm totally fresh as an android developer and now after some days of tinkering, in Eclipse, I've got some questions. Layout - I'd like to set up a bunch of buttons in an tidy manner. Lets say I have buttons and I like to arrange them like 5x5 buttons, 5 rows 5 columns. But I don't have a clue of do's and don'ts. Is there any 'good' way and are ways I should avoid? I'd like to set them up to fill the window with a small margin |left[5 buttons]right| top bottom the wrap the row. Drag and drop - I use android SDK, basically I just followed the set up suggested on android developer site. From what I understand I should be able to drag and drop items in the Graphic Layout. When I drag and drop stuff I just get empty tags, like <Button></Button> Is it possible to fill my items with attributes, not type it all out by myself? R.java stuff - Is there some kind of standard here, or do I just set up my R-subclasses as I please? res dpi-folders - How do I know where to put which, size or resolution, picture. If anyone could shed some light on this I'll be --> .