Android – private void sendregistrationtoserver (string token) parameter token is never used

I've tried all the available answers, but it doesn't help. What did I miss here?

private void sendRegistrationToServer(String token)`{
}

resolvent:

As mentioned in the comments, the question is vague, but I kind of get what you ask

Sendregistrationtoserver() is an optional method, which can be seen in most examples of firebase. Start with GitHub example:

package com.google.firebase.quickstart.fcm;

import android.util.Log;

import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.FirebaseInstanceIdService;


public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

    private static final String TAG = "MyFirebaseIIDService";

    /**
     * Called if InstanceID token is updated. This may occur if the security of
     * the prevIoUs token had been compromised. Note that this is called when the InstanceID token
     * is initially generated so this is where you would retrieve the token.
     */
    // [START refresh_token]
    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d(TAG, "Refreshed token: " + refreshedToken);

        // If you want to send messages to this application instance or
        // manage this apps subscriptions on the server side, send the
        // Instance ID token to your app server.
        sendRegistrationToServer(refreshedToken);
    }
    // [END refresh_token]

    /**
     * Persist token to third-party servers.
     *
     * Modify this method to associate the user's FCM InstanceID token with any server-side account
     * maintained by your application.
     *
     * @param token The new token.
     */
    private void sendRegistrationToServer(String token) {
        // TODO: Implement this method to send token to your app server.
    }
}

From here, you can see that sendregistrationtoserver() is called inside ontokenrefresh(), which generates a registration token for FCM. The code document has told sendregistrationtoserver() what should happen:

Sending the registration token to your own app server is optional, but it is strongly recommended (see FCM DOCS). This way, you can have the token for future use