Fixed depricated plugin issue.

src/android/com/adobe/phonegap/push/PushInstanceIDListenerService.java

@@ -5,22 +5,38 @@
 import android.content.SharedPreferences;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+
+import com.google.android.gms.tasks.OnCompleteListener;
+import com.google.android.gms.tasks.Task;
 import com.google.firebase.iid.FirebaseInstanceId;
-import com.google.firebase.iid.FirebaseInstanceIdService;
+import com.google.firebase.iid.InstanceIdResult;
+import com.google.firebase.messaging.FirebaseMessagingService;  //ADD FirebaseMessagingService
 
 import org.json.JSONException;
 
 import java.io.IOException;
 
-public class PushInstanceIDListenerService extends FirebaseInstanceIdService implements PushConstants {
+public class PushInstanceIDListenerService extends FirebaseMessagingService implements PushConstants {
     public static final String LOG_TAG = "Push_InsIdService";
 
+
     @Override
-    public void onTokenRefresh() {
+    public void onNewToken(String token) { //Added onNewToken method
         // Get updated InstanceID token.
-        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
-        Log.d(LOG_TAG, "Refreshed token: " + refreshedToken);
-        // TODO: Implement this method to send any registration to your app's servers.
-        //sendRegistrationToServer(refreshedToken);
+       FirebaseInstanceId.getInstance().getInstanceId().addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
+
+            @Override
+            public void onComplete(@NonNull Task<InstanceIdResult> task) {
+                if (!task.isSuccessful()) {
+                    Log.w(LOG_TAG, "getInstanceId failed", task.getException());
+                    return;
+                }
+
+                // Get new Instance ID token
+                String refreshedToken = task.getResult().getToken();
+                Log.d(LOG_TAG, "Refreshed token: " + refreshedToken);
+            }
+        });
     }
 }