Multi tool use

read data firebase and display on ListView [on hold]

MY Database (Firebase) Can You Help Me Fix This ?
I tried it but it does not appear in List view, is there Something wrong ? Help Me. im Stack in here
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package com.tracking.rahadiansyah.tracking;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import java.util.ArrayList;

public class history1 extends AppCompatActivity {

ListView listView;
FirebaseDatabase firebaseDatabase;
DatabaseReference databaseReference;
ArrayList<String> arrayList = new ArrayList<>();
ArrayAdapter<String> arrayAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_history1);

firebaseDatabase = FirebaseDatabase.getInstance();
databaseReference = firebaseDatabase.getReference().child("proyek-akhir-c93d7").child("1").child("xlog");

listView = (ListView) findViewById(R.id.listview);

Toast.makeText(this, "Tunggu Sebentar", Toast.LENGTH_SHORT).show();
databaseReference.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
String value=dataSnapshot.getValue(String.class);
arrayList.add(value);
arrayAdapter = new ArrayAdapter<String>(history1.this, android.R.layout.simple_list_item_1, arrayList);
listView.setAdapter(arrayAdapter);

}

@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {

}

@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {

}

@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {

}

@Override
public void onCancelled(DatabaseError databaseError) {

}
});

}}


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Firebase: Retrieve Data