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You'll often need to do this in order to later locate and interact with a specific view. Much like in HTML, we can also add id attributes to XML elements.
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android:layout_weight: Specifies how much of the extra space in the layout should be allocated to the view.android:layout_marginRight: Extra space to the right of the layout.android:layout_marginLeft: Extra space to the left of the layout.android:layout_marginBottom: Extra space on the bottom of the layout.android:layout_marginTop: Extra space on the top of the layout.android:layout_height: The height of the layout.android:layout_width: The width of the layout.android:id: A unique ID that corresponds to the view.
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The following are attributes that apply to all layouts: There are both common attributes that all layouts share, and attributes specific to some of the layout types listed above. These may not be the root element of a layout, but they may reside within the root element:Ī List View displays a list of scrollable items.Ī Grid View displays items in a two-dimensional, scrollable grid.Ī Table Layout groups views into rows and columns.Įvery type of layout has attributes that define the way its elements appear. Other commonly used ViewGroups are as follows. (For this reason, Frame Layouts should be used sparingly usually as a placeholder for Fragments, which we will cover later.) (ie: lining an element up to the top edge of a parent, centering it within a parent, etc.)Ī Frame Layout is a placeholder on a screen that can display only a single view.
#Xml file viewer android android#
The following three layout types may be the root element in an Android XML Layout:Ī Linear Layout aligns its contents into a single direction, whether vertical or horizontal.Ī Relative Layout displays its child content in positions relative to the parent. Text, images, and buttons are all Views in Android.Ī ViewGroup is a subclass of View, and is essentially an 'invisible container' that holds multiple Views or ViewGroups together, and defines their layout properties. It represents a rectangular area of the screen, and is responsible for displaying information or content, and event handling. All other XML elements will reside within this root object.Ī View is simply an object from Android's built-in View class. Linear Layouts, Relative Layouts, and Frame Layouts (see Root Views section below) may all be root elements. Anatomy of Android XML LayoutsĮach layout file must contain one (and only one!) root element. Resources are the additional files and static content an application needs, such as animations, color schemes, layouts, menu layouts. Much like creating an HTML layout and later altering it with jQuery, as we've done in previous courses, we can create XML layouts in Android, and later alter them using Java logic.Īndroid XML layouts are also part of a larger umbrella of Android files and components called resources. However, unlike HTML, XML is case-sensitive, requires each tag is closed properly, and preserves whitespace. It was created as a standard way to encode data in internet-based applications. Much like HTML (or HyperText Markup Language), XML is also a markup language. As we'll see firsthand when we create our first layout in the next lesson, Android layouts are written in eXtensible Markup Language, also known as XML.