java - How do I display an list of messages from Firebase in an Android TextView? -

so have simple array in firebase shown here:

i want able display messages in textview , add textview when new message added array. code display messages shown here:

        myfirebaseref.child("messages").child("message").addvalueeventlistener(new valueeventlistener() {          @override         public void ondatachange(datasnapshot snapshot) {             generictypeindicator<list<string>> t = new generictypeindicator<list<string>>() {};             list<string> messages = snapshot.getvalue(t);             if( messages == null ) {                 system.out.println("no messages");             }             else {                 for(int = 0; < messages.size(); i++) {                     messagedisplay.settext(messagedisplay.gettext() + "\n" + messages.get(i) + "\n");                 }             }         } 

this not working expected , getting "failed bounce type" exception on generictypeindicator. idea going wrong?

what looks array you, looks associative array firebase. difference subtle important, because means cannot deserialize json list<string>. instead if should map<string,string>.

but following approach lot simpler , better:

public void ondatachange(datasnapshot snapshot) {     if (snapshot.getchildrencount() == 0) {         system.out.println("no messages");     }      else {         (datasnapshot messagesnapshot: snapshot.getchildren()) {             string message = messagesnapshot.getvalue(string.class);             messagedisplay.settext(messagedisplay.gettext() + "\n" + message + "\n");         }     } }