Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

# TelephonyCallback.SignalStrengthsListener

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` public static interface TelephonyCallback.SignalStrengthsListener `   
` `

|---|
| android.telephony.TelephonyCallback.SignalStrengthsListener |

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*** ** * ** ***

Interface for network signal strengths listener.

## Summary

| ### Public methods ||
|---|---|
| ` abstract void` | ` https://developer.android.com/reference/android/telephony/TelephonyCallback.SignalStrengthsListener#onSignalStrengthsChanged(android.telephony.SignalStrength)(https://developer.android.com/reference/android/telephony/SignalStrength signalStrength) ` Callback invoked when network signal strengths changes on the registered subscription. |

## Public methods

### onSignalStrengthsChanged

Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public abstract void onSignalStrengthsChanged (SignalStrength signalStrength)
```

Callback invoked when network signal strengths changes on the registered subscription. Note, the registration subscription ID comes from `https://developer.android.com/reference/android/telephony/TelephonyManager` object which registers TelephonyCallback by `https://developer.android.com/reference/android/telephony/TelephonyManager#registerTelephonyCallback(java.util.concurrent.Executor,%20android.telephony.TelephonyCallback)`. If this TelephonyManager object was created with `https://developer.android.com/reference/android/telephony/TelephonyManager#createForSubscriptionId(int)`, then the callback applies to the subscription ID. Otherwise, this callback applies to `https://developer.android.com/reference/android/telephony/SubscriptionManager#getDefaultSubscriptionId()`.

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| Parameters ||
|---|---|
| `signalStrength` | `SignalStrength`: This value cannot be `null`. <br /> |