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Android radio buttons
- Radio buttons allow the user to select one option from a set.
- You should use radio buttons for optional sets that are mutually exclusive if you think that the user needs to see all available options side-by-side.
- If it's not necessary to show all options side-by-side, use a spinner instead.
- To create each radio button option, create a RadioButton in your layout.
- However, because radio buttons are mutually exclusive, you must group them together inside a RadioGroup.
- By grouping them together, the system ensures that only one radio button can be selected at a time.
- In Android, you can use “android.widget.RadioButton” class to render radio button, and those radio buttons are usually grouped by android.widget.RadioGroup.
- If RadioButtons are in group, when one RadioButton within a group is selected, all others are automatically deselected.
- We show you how to use XML to create two radio buttons, and grouped in a radio group. When button is clicked, display which radio button is selected.
1. Custom String
- Open “res/values/strings.xml” file, add some custom string for radio button.
File : res/values/strings.xml
- Open “res/layout/main.xml” file, add “RadioGroup“, “RadioButton” and a button, inside the LinearLayout.
- Radio button selected by default.
- To make a radio button is selected by default, put android:checked="true" within the RadioButton element. In this case, radio option “Male” is selected by default.
File : res/layout/main.xml
3. Code Code
- Inside activity “onCreate()” method, attach a click listener on button.
File : MyAndroidAppActivity.java
4. Demo - android emulator - android tutorial
- Run the application.
- Result, radio option “Male” is selected.
- Select “Female” and click on the “display” button, the selected radio button value is displayed.