Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

# RadioGroup.OnCheckedChangeListener

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` public static interface RadioGroup.OnCheckedChangeListener `   
` `

|---|
| android.widget.RadioGroup.OnCheckedChangeListener |

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Interface definition for a callback to be invoked when the checked radio button changed in this group.

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## Summary

| ### Public methods ||
|---|---|
| ` abstract void` | ` https://developer.android.com/reference/android/widget/RadioGroup.OnCheckedChangeListener#onCheckedChanged(android.widget.RadioGroup,%20int)(https://developer.android.com/reference/android/widget/RadioGroup group, int checkedId) ` <br /> Called when the checked radio button has changed. |

## Public methods

### onCheckedChanged

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public abstract void onCheckedChanged (RadioGroup group, 
                int checkedId)
```

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Called when the checked radio button has changed. When the selection is cleared, checkedId is -1.

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| Parameters ||
|---|---|
| `group` | `RadioGroup`: the group in which the checked radio button has changed. This value cannot be `null`. <br /> |
| `checkedId` | `int`: the unique identifier of the newly checked radio button <br /> |