STRUCTURE AND CONTENTS OF A USER INTERFACE
structure and contents of a user interface
XML is the main layout file format in Android Studio and it’s used to define the structure and contents of a user interface. In XML, you can create a layout for your Android app by defining the views and their properties.
The basic views in XML Layout in Android Studio include:
- TextView: displays text to the user.
- ImageView: displays an image.
- Button: creates a clickable button.
- EditText: allows the user to enter text.
- CheckBox: displays a checkbox that the user can toggle on or off.
- RadioButton: displays a radio button, which the user can select from a group.
- Switch: displays a switch that the user can toggle on or off.
- SeekBar: allows the user to select a value by moving a slider.
- ProgressBar: displays a progress bar to show the progress of an operation.
- Spinner: displays a drop-down list for the user to select from.
To use these views in your layout, you declare them in your XML file and set their properties, such as their text, color, size, and layout attributes. For example, the following XML code creates a TextView with text “Hello, World!” and sets its text size to 20sp:
<?xml version="1.0" encoding="utf-8"?> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello, World!" android:textSize="20sp" />
You can also nest views inside other views to create more complex layouts. For example, you can put a TextView inside a LinearLayout to create a vertical or horizontal list of items.
This is a brief overview of the basic views in XML Layout in Android Studio. There’s much more to learn and explore, including more advanced features like custom styles, themes, and layouts.