Android studio 8 Radio Group and Radio Buttons
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. Key classes are the following: RadioButton RadioGroup Responding to Click Events When the user selects one of the radio buttons, the corresponding RadioButton object receives an on-click event. To define the click event handler for a button, add the android:onClick attribute to the <RadioButton> element in your XML layout. ...