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# TelephonyCallback.MessageWaitingIndicatorListener

`public static interface TelephonyCallback.MessageWaitingIndicatorListener`
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android.telephony.TelephonyCallback.MessageWaitingIndicatorListener

Interface for message waiting indicator listener.

## Summary

### Public methods
`abstract void` | `onMessageWaitingIndicatorChanged(boolean mwi)` Callback invoked when the message-waiting indicator changes on the registered subscription.

## Public methods

### onMessageWaitingIndicatorChanged

    public abstract void onMessageWaitingIndicatorChanged (boolean mwi)

Callback invoked when the message-waiting indicator changes on the registered subscription. Note, the registration subscription ID comes from `TelephonyManager` object by `TelephonyManager#registerTelephonyCallback(Executor, TelephonyCallback)`. If this TelephonyManager object was created with `TelephonyManager#createForSubscriptionId(int)`, then the callback applies to the subscription ID. Otherwise, this callback applies to `SubscriptionManager#getDefaultSubscriptionId()`.
Requires `Manifest.permission.READ_PHONE_STATE`

Parameters
`mwi` | `boolean`

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