Question

Understand that 1×1 widget size should be 72 dip x 72 dip, but this is seems to be less than standard icon size. If I change size to 80 dip x 80 dip, then it looks as the same. Is it OK if I would use this size?

Answer 1

Quoting the documentation:

The default Home screen positions App
Widgets in its window based on a grid
of cells that have a defined height
and width. If the values for an App
Widget’s minimum width or height don’t
match the dimensions of the cells,
then the App Widget dimensions round
up to the nearest cell size. (See the
App Widget Design Guidelines for more
information on the Home screen cell
sizes.)

Because the Home screen’s layout
orientation (and thus, the cell sizes)
can change, as a rule of thumb, you
should assume the worst-case cell size
of 74 pixels for the height and width
of a cell. However, you must subtract
2 from the final dimension to account
for any integer rounding errors that
occur in the pixel count.

Those instructions are for “the default Home screen”. Other home screen implementations may behave differently. If your widget layout and such will work well both at the regular size and your slightly larger size, in principle your 80dip will work — just understand that your request for 8dip of additional space will typically be ignored.

Personally, I would use 72dip, to ensure compatibility.