The following is the first few sections of a chapter from The Busy Coder's Guide to Android Development, plus headings for the remaining major sections, to give you an idea about the content of the chapter.
If you are using an IDE, and you have been experimenting with the graphical layout editor and drag-and-drop GUI building, this chapter will cover some other general features of this editor that you may find useful.
Even if you are not using an IDE, you may want to at least skim this chapter, as you will find a few tricks that will be relevant for you as well.
Clicking on a widget makes it the selected widget, meaning that the toolbar buttons will affect that widget (or, sometimes, its container, depending upon the button). Selected widgets have a thin blue border with blue square “grab handles” for adjusting its size and position.
Figure 154: Android Studio, Selected Widget in Graphical Layout Editor
Clicking on a container also selects it. However, there may or
may not be a blue border — in particular, containers that fill the
match_parent for width and height) do not seem to get the
Sometimes, though, you want to select a container that you cannot reach, because its contents are completely filled with widgets. In these cases, click on the widget or container in the Component Tree pane to select it.
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