For the More Curious: Margins vs Padding
In both GeoQuiz and CriminalIntent, you have given widgets margin and padding attributes. Beginning developers sometimes get confused about these two. Now that you understand what a layout parameter is, the difference is easier to explain.
Margin attributes are layout parameters. They determine the distance between widgets. Given that a widget can only know about itself, margins must be the responsibility of the widget’s parent.
Padding, on the other hand, is not a layout parameter.
android:padding attribute tells the widget how much bigger than its contents it should draw itself. For example, say you wanted the date button to be spectacularly large without changing its text size ...