java - how to show data from firebase into a textview -


hi i'm new @ programming , want show data firebase database textview. have written code doesn't work. hope can me

thank you

this code

public void gotoanotheractivity19(view view) {     firebaseuser user = firebaseauth.getinstance().getcurrentuser();     assert user != null;     final string log_uid = user.getuid();     final string eintrag = eintragtagebuch.gettext().tostring().trim();     intent intent = new intent(this, tagebuch.class);     firebasedatabase database = firebasedatabase.getinstance();     databasereference myref = database.getreference("user" + log_uid);     myref.child("tagebuch").push().setvalue("ihr eintrag: " +  eintrag );     startactivity(intent);     eingabeausgeben();  }     public void eingabeausgeben() {         tagebuchtext = (textview) findviewbyid(r.id.tagebuch_text2);          databasereference rootref = firebasedatabase.getinstance().getreference();         firebaseuser user = firebaseauth.getinstance().getcurrentuser();         assert user != null;         final string log_uid = user.getuid();         databasereference tagebuchref = rootref.child("user"+log_uid).child("tagebuch");         valueeventlistener eventlistener = new valueeventlistener() {               public void ondatachange(datasnapshot datasnapshot) {                 for(datasnapshot ds : datasnapshot.getchildren()) {                    string value = ds.getvalue(string.class);                     log.e("tag", value + ", ");                     tagebuchtext.settext("deine einträge" + value);                 }             }              @override             public void oncancelled(databaseerror databaseerror) {}         };         tagebuchref.addlistenerforsinglevalueevent(eventlistener);     }


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