What is radio button and how you can add radio button in android app with android studio. Lets check its example and attributes to gave good understanding of this user interface element.
What is Radio Button?
A Radio Button is a UI element that allows the user to choose only one of a predefined set of mutually exclusive options. Radio buttons are usually presented in groups, where only one radio button can be selected at a time.
In Android, you can use the RadioButton class to create a radio button. The radio button can be added to a layout with the RadioGroup view group, which makes it possible for the user to select only one radio button at a time.
How To Add Radio Button In Android App
To add a radio button in Android, add the following lines of code in the XML file of your activity:
<RadioGroup android:id=”@+id/radio_group” android:layout_width=”wrap_content” android:layout_height=”wrap_content”> <RadioButton android:id=”@+id/radio_button_1″ android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:text=”Option 1″ /> <RadioButton android:id=”@+id/radio_button_2″ android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:text=”Option 2″ /> </RadioGroup>
In this example, the radio buttons are contained within a RadioGroup view group, which allows the user to select only one of the two options. The RadioButton class is used to define the individual radio buttons, and the text attribute is used to specify the label for each radio button.
You can then use the RadioGroup and RadioButton views in your code to handle user input and update the UI as needed. For example, you can use the setOnCheckedChangeListener method of the RadioGroup to listen for changes to the selected radio button, and use the isChecked method of the RadioButton to determine which radio button is currently selected.
Radio Button Attributes:
Here are some of the most commonly used attributes for RadioButton views in Android:
- android:id: This attribute is used to uniquely identify the radio button in the layout. You can use this attribute to reference the radio button in your code.
- android:layout_width and android:layout_height: These attributes are used to specify the width and height of the radio button. You can set these attributes to a specific size in pixels, or you can use one of the predefined constants such as wrap_content or match_parent to set the size to the natural size of the radio button or the size of its parent view, respectively.
- android:text: This attribute is used to specify the label for the radio button. The label will be displayed next to the radio button to indicate the option that the radio button represents.
- android:checked: This attribute is used to specify whether the radio button should be checked by default. You can set this attribute to true to have the radio button checked when the layout is first displayed, or false to have it unchecked.
- android:buttonTint: This attribute is used to specify the color of the radio button indicator. You can set this attribute to a color resource or a color value in the form of a hexadecimal string.
- android:gravity: This attribute is used to specify how the radio button’s label should be aligned within the view. You can use this attribute to align the label to the left, right, top, bottom, or center of the radio button.
There are many other attributes that you can use to customize the appearance and behavior of RadioButton views in Android. You can find more information about these attributes in the Android documentation