How To Write XML For Mobile App UI Design

Posted by Anand Saama on March 12th, 2020

A mobile app UI design defines the structure for a user interface or UI in an activity. If you know little bit about app designing, all elements in the app layout are arranged using a hierarchy of View and ViewGroup objects.

Let’s See In Detail About View And Other Objects Of Viewgroup-

A View is used to draw something that a user can see and interact with and a ViewGroup is an invisible container that can define the layout design for View as well as other objects of ViewGroup. There are some view objects present and play vital role in UI designing, these view objects are referred as "widgets". The widgets can be one of many subclasses, for example, Button or TextView. The ViewGroup objects or layouts provide a diverse layout structure, for example, ConstraintLayout or LinearLayout.

Let’s have a look at two ways to declare a layout-

#1. Declare The Mobile App UI Design Elements In XML

Android system has a straightforward and simple XML vocabulary that corresponds to the subclasses and View classes, such as those for widgets and layouts. A designer makes use of the Android Studio's Layout Editor for building XML layout with the help of a drag-and-drop interface.

#2. Instantiate Layout Elements At Runtime

Instantiating layout elements at runtime includes creating View and ViewGroup objects and manipulate their properties. Furthermore, declaring your mobile app UI design in XML lets you separate the presentation of application from the source code that controls the working. Use of XML files makes it straightforward to provide suitable layouts according to the varying screen sizes and their orientations.

For building the mobile app UI design, the Android framework offers flexibility to use any of these above mentioned methods. You can declare default layouts in XML, and change/ modify the layout during runtime.

How To Write XML For Mobile App UI Design

Using Android's XML, it is possible to instantly design UI layouts with the screen elements, as you create web pages in HTML as a series of nested elements.

The layout file contains exactly one root element that must be a View or ViewGroup object. After you have defined the root element, add other layout widgets or objects as child elements for building a View hierarchy to define your layout. For example, here's a sample XML layout for vertical LinearLayout to hold a Button and a TextView:

              android:layout_width="match_parent"

              android:layout_height="match_parent"

              android:orientation="vertical" >

              android:layout_width="wrap_content"

              android:layout_height="wrap_content"

              android:text="Hello, this is TextView" />

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Hello, this is a Button" />

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