# Selection controls: radio buttons [Selection controls](https://material.io/components/selection-controls#usage) allow the user to select options. Use radio buttons to: * Select a single option from a list * Expose all available options * If available options can be collapsed, consider using a dropdown menu instead, as it uses less space.  ## Contents * [Using radio buttons](#using-radio-buttons) * [Radio button](#radio-button) * [Theming radio buttons](#theming-radio-buttons) ## Using radio buttons Before you can use Material radio buttons, you need to add a dependency to the Material Components for Android library. For more information, go to the [Getting started](https://github.com/material-components/material-components-android/tree/master/docs/getting-started.md) page. _**Note:** `` is auto-inflated as `` via `MaterialComponentsViewInflater` when using a non-Bridge `Theme.MaterialComponents.*` theme._ ### Making radio buttons accessible Radio buttons support content labeling for accessibility and are readable by most screen readers, such as TalkBack. Text rendered in radio buttons is automatically provided to accessibility services. Additional content labels are usually unnecessary. ### Grouping radio buttons Changes in the states of one radio button can affect other buttons in the group. Specifically, selecting a `RadioButton` in a `RadioGroup` will de-select all other buttons in that group. See the [example section below](#radio-buttons-example) for implementation details. ## Radio button A radio button is a circle that is filled in with an inset when selected. Radio buttons allow the user to select one option from a set. Use radio buttons when the user needs to see all available options. If available options can be collapsed, consider using a dropdown menu because it uses less space. ### Radio buttons example API and source code: * `MaterialRadioButton` * [Class definition](https://developer.android.com/reference/com/google/android/material/radiobutton/MaterialRadioButton) * [Class source](https://github.com/material-components/material-components-android/tree/master/lib/java/com/google/android/material/radiobutton/MaterialRadioButton.java) * `RadioGroup` * [Class definition](https://developer.android.com/reference/android/widget/RadioGroup) The following example shows a radio button group with five radio buttons.  In the layout: ```xml ``` In code: ```kt val checkedRadioButtonId = radioGroup.checkedRadioButtonId // Returns View.NO_ID if nothing is checked. radioGroup.setOnCheckedChangeListener { group, checkedId -> // Responds to child RadioButton checked/unchecked } // To check a radio button radioButton.isChecked = true // To listen for a radio button's checked/unchecked state changes radioButton.setOnCheckedChangeListener { buttonView, isChecked // Responds to radio button being checked/unchecked } ``` ## Key properties ### Radio button attributes   | Attribute | Related method(s) | Default value -------------------------- | ------------------------------------------ | ---------------------------------------------------------- | ------------- **To use material colors** | `app:useMaterialThemeColors` | `setUseMaterialThemeColors`
`isUseMaterialThemeColors` | `true` (ignored if `app:buttonTint` is set) **Color** | `app:buttonTint` | `setButtonTintList`
`getButtonTintList` | `null` **Min size** | `android:minWidth`
`android:minHeight` | `(set/get)MinWidth`
`(set/get)MinHeight` | `?attr/minTouchTargetSize` The color of the radio button defaults to `?attr/colorOnSurface` (unchecked) and `?attr/colorSecondary` (checked) defined in your app theme. If you want to override this behavior, as you might with a custom drawable that should not be tinted, set `app:useMaterialThemeColors` to `false`: ```xml ``` ### Text label attributes   | Attribute | Related method(s) | Default value -------------- | ------------------------ | ---------------------------------- | ------------- **Text label** | `android:text` | `setText`
`getText` | `null` **Color** | `android:textColor` | `setTextColor`
`getTextColors` | inherits from `AppCompatRadioButton` **Typography** | `android:textAppearance` | `setTextAppearance` | inherits from `AppCompatRadioButton` ### Radio button states Radio buttons can be selected or unselected. Radio buttons have enabled, disabled, hover, focused, and pressed states.  ### Styles   | Style ----------------- | ------------------------------------------------------ **Default style** | `Widget.MaterialComponents.CompoundButton.RadioButton` Default style theme attribute: `?attr/radioButtonStyle` See the full list of [styles](https://github.com/material-components/material-components-android/tree/master/lib/java/com/google/android/material/radiobutton/res/values/styles.xml) and [attrs](https://github.com/material-components/material-components-android/tree/master/lib/java/com/google/android/material/radiobutton/res/values/attrs.xml). ## Theming radio buttons Radio buttons support [Material Theming](https://material.io/components/selection-controls#theming) and can be customized in terms of color and typography. ### Radio button theming example API and source code: * `MaterialRadioButton` * [Class definition](https://developer.android.com/reference/com/google/android/material/radiobutton/MaterialRadioButton) * [Class source](https://github.com/material-components/material-components-android/tree/master/lib/java/com/google/android/material/radiobutton/MaterialRadioButton.java) * `RadioGroup` * [Class definition](https://developer.android.com/reference/android/widget/RadioGroup) The following example shows a radio button with Material Theming.  #### Implementing radio button theming Using theme attributes in `res/values/styles.xml` (themes all radio buttons and affects other components): ```xml ``` or using default style theme attributes, styles and theme overlays (themes all radio buttons but does not affect other components): ```xml ``` you can also change the radio button colors via the `?attr/buttonTint` attribute: ```xml ``` and in `color/button_tint.xml`: ```xml ``` or using the styles in the layout (affects only this radio button): ```xml ```