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class ScreeningService : CallScreeningService() {
    // This function is called when an ingoing or outgoing call
    // is from a number not in the user's contacts list
    override fun onScreenCall(callDetails: Call.Details) {
        // Can check the direction of the call
        val isIncoming = callDetails.callDirection == Call.Details.DIRECTION_INCOMING

        if (isIncoming) {
            // the handle (e.g. phone number) that the Call is currently connected to
            val handle: Uri = callDetails.handle

            // determine if you want to allow or reject the call
            when (callDetails.callerNumberVerificationStatus) {
                Connection.VERIFICATION_STATUS_FAILED -> {
                    // Network verification failed, likely an invalid/spam call.
                }
                Connection.VERIFICATION_STATUS_PASSED -> {
                    // Network verification passed, likely a valid call.
                }
                else -> {
                    // Network could not perform verification.
                    // This branch matches Connection.VERIFICATION_STATUS_NOT_VERIFIED.
                }
            }
        }
    }
}

class ScreeningService extends CallScreeningService {
    @Override
    public void onScreenCall(@NonNull Call.Details callDetails) {
        boolean isIncoming = callDetails.getCallDirection() == Call.Details.DIRECTION_INCOMING;

        if (isIncoming) {
            Uri handle = callDetails.getHandle();

            switch (callDetails.getCallerNumberVerificationStatus()) {
                case Connection.VERIFICATION_STATUS_FAILED:
                    // Network verification failed, likely an invalid/spam call.
                    break;
                case Connection.VERIFICATION_STATUS_PASSED:
                    // Network verification passed, likely a valid call.
                    break;
                default:
                    // Network could not perform verification.
                    // This branch matches Connection.VERIFICATION_STATUS_NOT_VERIFIED
            }
        }
    }
}

// Tell the system how to respond to the incoming call
// and if it should notify the user of the call.
val response = CallResponse.Builder()
    // Sets whether the incoming call should be blocked.
    .setDisallowCall(false)
    // Sets whether the incoming call should be rejected as if the user did so manually.
    .setRejectCall(false)
    // Sets whether ringing should be silenced for the incoming call.
    .setSilenceCall(false)
    // Sets whether the incoming call should not be displayed in the call log.
    .setSkipCallLog(false)
    // Sets whether a missed call notification should not be shown for the incoming call.
    .setSkipNotification(false)
    .build()

// Call this function to provide your screening response.
respondToCall(callDetails, response)

// Tell the system how to respond to the incoming call
// and if it should notify the user of the call.
CallResponse.Builder response = new CallResponse.Builder();
// Sets whether the incoming call should be blocked.
response.setDisallowCall(false);
// Sets whether the incoming call should be rejected as if the user did so manually.
response.setRejectCall(false);
// Sets whether ringing should be silenced for the incoming call.
response.setSilenceCall(false);
// Sets whether the incoming call should not be displayed in the call log.
response.setSkipCallLog(false);
// Sets whether a missed call notification should not be shown for the incoming call.
response.setSkipNotification(false);

// Call this function to provide your screening response.
respondToCall(callDetails, response.build());

class RedirectionService : CallRedirectionService() {
    override fun onPlaceCall(
        handle: Uri,
        initialPhoneAccount: PhoneAccountHandle,
        allowInteractiveResponse: Boolean
    ) {
        // Determine if the call should proceed, be redirected, or cancelled.
        val callShouldProceed = true
        val callShouldRedirect = false
        when {
            callShouldProceed -> {
                placeCallUnmodified()
            }
            callShouldRedirect -> {
                // Update the URI to point to a different phone number or modify the
                // PhoneAccountHandle and redirect.
                redirectCall(handle, initialPhoneAccount, true)
            }
            else -> {
                cancelCall()
            }
        }
    }
}

class RedirectionService extends CallRedirectionService {
    @Override
    public void onPlaceCall(
            @NonNull Uri handle,
            @NonNull PhoneAccountHandle initialPhoneAccount,
            boolean allowInteractiveResponse
    ) {
        // Determine if the call should proceed, be redirected, or cancelled.
        // Your app should implement this logic to determine the redirection.
        boolean callShouldProceed = true;
        boolean callShouldRedirect = false;
        if (callShouldProceed) {
            placeCallUnmodified();
        } else if (callShouldRedirect) {
            // Update the URI to point to a different phone number or modify the
            // PhoneAccountHandle and redirect.
            redirectCall(handle, initialPhoneAccount, true);
        } else {
            cancelCall();
        }
    }
}

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Tell the system that you want your app to handle call redirects. This
        // is done by using the RoleManager to register your app to handle redirects.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
            val roleManager = getSystemService(Context.ROLE_SERVICE) as RoleManager
            // Check if the app needs to register call redirection role.
            val shouldRequestRole = roleManager.isRoleAvailable(RoleManager.ROLE_CALL_REDIRECTION) &&
                    !roleManager.isRoleHeld(RoleManager.ROLE_CALL_REDIRECTION)
            if (shouldRequestRole) {
                val intent = roleManager.createRequestRoleIntent(RoleManager.ROLE_CALL_REDIRECTION)
                startActivityForResult(intent, REDIRECT_ROLE_REQUEST_CODE)
            }
        }
    }

    companion object {
        private const val REDIRECT_ROLE_REQUEST_CODE = 1
    }
}

class MainActivity extends AppCompatActivity {
    private static final int REDIRECT_ROLE_REQUEST_CODE = 0;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Tell the system that you want your app to handle call redirects. This
        // is done by using the RoleManager to register your app to handle redirects.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
            RoleManager roleManager = (RoleManager) getSystemService(Context.ROLE_SERVICE);
            // Check if the app needs to register call redirection role.
            boolean shouldRequestRole = roleManager.isRoleAvailable(RoleManager.ROLE_CALL_REDIRECTION) &&
                    !roleManager.isRoleHeld(RoleManager.ROLE_CALL_REDIRECTION);
            if (shouldRequestRole) {
                Intent intent = roleManager.createRequestRoleIntent(RoleManager.ROLE_CALL_REDIRECTION);
                startActivityForResult(intent, REDIRECT_ROLE_REQUEST_CODE);
            }
        }
    }
}