contoh get alarm status

package com.iqbal.homesecurity;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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 com.google.firebase.database.ValueEventListener;


/**
 * A simple {@link Fragment} subclass.
 */
public class DashboardFragment extends Fragment {

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference();
    private TextView textAlarmStatus;

    public DashboardFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_dashboard, container, false);

        // Read from the database
        myRef.child("alarm_status").addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                // This method is called once with the initial value and again
                // whenever data at this location is updated.
                String value = dataSnapshot.getValue(String.class);

                //contoh yg aku ditampilin di text view
                textAlarmStatus = getView().findViewById(R.id.txt_alarm_status);
                textAlarmStatus.setText(value);
            }

            @Override
            public void onCancelled(DatabaseError error) {
                // Failed to read value
                Log.w("ERROR", "Failed to read value.", error.toException());
            }
        });

        return view;
    }

}