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# TelephonyCallback.SignalStrengthsListener

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

Interface for network signal strengths listener.

## Summary

### Public methods
`abstract void` | `onSignalStrengthsChanged(SignalStrength signalStrength)` Callback invoked when network signal strengths changes on the registered subscription.

## Public methods

### onSignalStrengthsChanged

    public abstract void onSignalStrengthsChanged (SignalStrength signalStrength)

Callback invoked when network signal strengths changes on the registered subscription. Note, the registration subscription ID comes from `TelephonyManager` object which registers TelephonyCallback 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()`.

Parameters
`signalStrength` | `SignalStrength`: This value cannot be `null`.

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