CODEWITHSUNDEEP
javaandroidfirebasefirebase-cloud-messaging
NGUNIVERSITIES
NGUNIVERSITIES

Reputation: 35

Android Studio issue; change variable 'refreshedToken' type to 'Task<String>

How can I correct this block of code since FirebaseInstanceId is deprecated in Android Studio?

String refreshedToken = FirebaseInstanceId.getInstance().getToken();

I tried to change it to this:

String refreshedToken = FirebaseMessaging.getInstance().getToken();

But when I do this, I get an error saying

Change variable 'refreshedToken' type to 'Task<String>'

My full code is:

import android.app.Application;

import androidx.multidex.MultiDexApplication;

import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.messaging.FirebaseMessaging;

public class MyApplication extends MultiDexApplication {

    @Override
    public void onCreate() {
        super.onCreate();

        FirebaseDatabase.getInstance().setPersistenceEnabled(true);

        FirebaseMessaging.getInstance().subscribeToTopic("fireblogappnotification");
         String refreshedToken = FirebaseInstanceId.getInstance().getToken();
    }
}

Upvotes: 0

Views: 349

Answers (2)

Alex Mamo
Alex Mamo

Reputation: 138969

You are getting the following error:

Change variable 'refreshedToken' type to 'Task'

Because you are trying to save an object of type Task<String> into an object of type String, which is actually not possible in Java, and this is because there is no inheritance relationship between these two classes.

In order to get the token, you need to attach a listener. So please try the following lines of code:

Task<String> tokenTask = FirebaseMessaging.getInstance().getToken();
tokenTask.addOnCompleteListener(new OnCompleteListener<String>() {
    @Override
    public void onComplete(@NonNull Task<String> task) {
        if (task.isSuccessful()) {
            String token = task.getResult();
            Log.d("TAG", "token: " + token);
            //Do what you need to do with your token
        }
    }
});

Upvotes: 1

Mayur Gajra
Mayur Gajra

Reputation: 9073

It's giving you that error because FirebaseMessaging.getInstance().getToken(); has return type of Task<String> & you're using String.

So what you can do is add listener & wait for task to complete & get token from that.

As following:

Task<String> refreshedToken = FirebaseMessaging.getInstance().getToken();
        refreshedToken.addOnCompleteListener(new OnCompleteListener<String>() {
            @Override
            public void onComplete(@NonNull @NotNull Task<String> task) {
                if (task.isSuccessful()){
                    String token = task.getResult();
                }
            }
        });

Upvotes: 1

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