![]() ![]() You are reading a sample chapter from the Android Studio 3.2 Edition of this book. In the following example a Button widget has been added as a child of the ConstraintLayout: Use dp in preference to this unit.Īny children that need to be added to the ConstraintLayout parent must be nested within the opening and closing tags. Use is not recommended since different displays will have different pixels per inch. Similar to dp but scaled based on the user’s font preference. ![]() An abstract unit of measurement based on the physical density of the device display relative to a 160dpi display baseline. ![]() Any specification of spacing in an Android layout must be specified using one of the following units of measurement: Note that in the above example the layout element is also configured with padding on each side of 16dp (density independent pixels). The following XML, for example, declares a ConstraintLayout view as the root element, assigns the ID activity_main and sets match_parent attributes such that it fills all the available space of the device display: This is represented by both opening and closing tags and any properties that need to be set on the view. This declaration should be followed by the root element of the layout, typically a container view such as a layout manager. The first line of an XML resource file should ideally include the following standard declaration: The structure of an XML layout file is actually quite straightforward and follows the hierarchical approach of the view tree. ![]()
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