CallStateListener

onCallStateChanged

abstract fun onCallStateChanged(state: Int): Unit

Callback invoked when device call state changes.

Reports the state of Telephony (mobile) calls on the device for 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().

Note: The state returned here may differ from that returned by TelephonyManager#getCallState(). Receivers of this callback should be aware that calling TelephonyManager#getCallState() from within this callback may return a different state than the callback reports.
Requires android.Manifest.permission#READ_PHONE_STATE