The structure for a user isnterface or UI in any mobile activity is termed as mobile app UI design. In the app layout all the elements are arranged using a hierarchy of View and different view objects. It is very essential to know XML for mobile app UI design.
So, its time to know in detail about view and other objects of ViewGroup-
A View is utilized as something to draw that a user can interact with and a ViewGroup is a non-visible container that can termed the layout design for View also other objects of ViewGroup.
There are some view objects that are present, which play important role in UI designing; all these objects are known as "widgets". The widgets can be one of many sub divisions such as Button or TextView. ViewGropu objects offer a diverse layout structure, for instance, ConstraintLayout or LinearLayout.
Its time to know about these two layouts:
#1. Assert The Mobile App UI Design Elements In XML
Android system has a very direct and easy XML vocabulary that resembles to the sub divisions of View classes like those for widgets and layouts. A core designer assures of the Android Studio's Layout Editor for building XML layout by using of a drag-and-drop interface.
#2. Incorporate Layout Elements At Runtime
Incorporating layout elements at runtime involves creating View and ViewGroup objects and can change their properties. Alsso, declaring your mobile app UI design in XML helps you to distinct the presentation of application from the source code that controls the functioning. It makes exceptionally direct to offer desired and well suited layouts according to the changing screen sizes and their orientations while using XML files.
When you want to build the mobile app UI design, the Android framework offers relaxation to apply one of the methods explained above. You can declare default layouts in XML and can easily change it during runtime.
How To Write XML For Mobile App UI Design?
Using Android's XML, it is possible to quickly design UI layouts with the required screen elements, as you build web pages in HTML as a cascade of nested elements.
There is one main element in the layout file that must be a View or ViewGroup object. Once you have got the root element, add other layout widgets or objects as sub elements for building a View pyramid to clearly define your layout. For example, here's a sample XML layout for vertical LinearLayout to hold a Button.
Loading The XML Resource
While compiling the whole application, each XML layout file can be compiled together as a Viewsource. The designer have to load the layout resource from the app code, in Activity.onCreate () callback application. One can do this by calling setContentView(), and passing it the reference to the layout resource is in the form of: R.layout.layout_file_name.
A note on attributes- Every View and ViewGroup object backs up own variety of XML attributes. Some attributes are very specific to a View object, such as TextView supports the textSize attribute); though, these attributes are hereditary by any View objects that can extend its class.
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