java - android studio firebase gettoken id -


i programming chat app , want save token id in firebase database got token empty. code: 

firebaseuser user = firebaseauth.getinstance().getcurrentuser();      string user_id = mauth.getcurrentuser().getuid();     string device_id = firebaseinstanceid.getinstance().gettoken();      toast.maketext(this, device_id, toast.length_short).show();     mdatabasetokenid.child(user_id).child("device_token").setvalue(device_id).addoncompletelistener(new oncompletelistener<void>() {         @override         public void oncomplete(@nonnull task<void> task) {              if (task.issuccessful()){              }else{                 toast.maketext(loginactivity.this, ""+task.getexception()                         , toast.length_short).show();             }         }     });     if(user.isemailverified()){           intent intent = new intent(getapplicationcontext(),mainactivity.class);          intent.addflags(intent.flag_activity_new_task | intent.flag_activity_clear_task);          startactivity(intent);          finish();

the device_id return empty why? please me, guys.

add service in manifest

 <service   android:name=".myfirebaseinstanceidservice">      <intent-filter>         <action android:name="com.google.firebase.instance_id_event"/>      </intent-filter>  </service>

you have ontokenrefresh method in service below

@override public void ontokenrefresh() {     // updated instanceid token.     string refreshedtoken = firebaseinstanceid.getinstance().gettoken();     log.d(tag, "refreshed token: " + refreshedtoken);      // todo: implement method send registration app's servers.     sendregistrationtoserver(refreshedtoken); }

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