How would I indicate a required radio button to the user in Android?

1. How to set radio button selected in android?
2. How to know which radio button is selected in android?
3. How to use radio button in android?
4. How do I make sure only one radio button is selected in android Studio?

How to set radio button selected in android?

To make a radio button is selected by default, put android:checked="true" within the RadioButton element.

How to know which radio button is selected in android?

You can check the current state of a radio button programmatically by using isChecked() method. This method returns a Boolean value either true or false. if it is checked then returns true otherwise returns false. Below is an example code with explanation in which we checked the current state of a radio button.

How to use radio button in android?

RadioButton is a two states button which is either checked or unchecked. If a single radio button is unchecked, we can click it to make checked radio button. Once a radio button is checked, it cannot be marked as unchecked by user. RadioButton is generally used with RadioGroup.

How do I make sure only one radio button is selected in android Studio?

You can use android:checkedButton attribute on RadioGroup, providing the id of the RadioButton you want to be checked initially and selecting another RadioButton will clear the previous selection. Save this answer.