public class Frag_SearchFragment extends Fragment {

private final static String TAG = Frag_SearchFragment.class.getName().toString();

ListView listView;
EditText searcher;
private String uid;
private String displayname ;
private String address ;
private String postcode ;
private String description;
private String contactNo;
private String image ;
private String email;
private String name;
private Boolean isBusiness;
private shopListAdapter adapter;
ArrayList<HairShop> shop = new ArrayList<>();

databaseHelper helper;

private View searchFragView;


private DatabaseReference listref;

public Frag_SearchFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    searchFragView = inflater.inflate(R.layout.fragment_frag__search, container, false);
    init();
    readFirebaseData();


    return searchFragView;
}

private void init() {
    listView = (ListView) searchFragView.findViewById(R.id.listShopView);
    searcher = (EditText) searchFragView.findViewById(R.id.search_tf);
    listref = FirebaseDatabase.getInstance().getReference().child("businessAcc");


}

private void readFirebaseData() { <------------------IT is where I think the problem is.
    FirebaseDatabase.getInstance().getReference("businessAcc").addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                uid = (String) snapshot.child("uid").getValue();
                displayname = (String) snapshot.child("username").getValue();
                address = (String) snapshot.child("address").getValue();
                postcode = (String) snapshot.child("postCode").getValue();
                description = (String) snapshot.child("description").getValue();
                contactNo = (String) snapshot.child("contactNo").getValue();
                image = (String) snapshot.child("image").getValue();
                email = (String) snapshot.child("email").getValue();
                name = (String) snapshot.child("name").getValue();
                isBusiness = (Boolean) snapshot.child("isBusiness").getValue();



                HairShop shops = new HairShop(uid, displayname, address, postcode, contactNo, description, image, email, isBusiness);
                shop.add(shops);

                shopListAdapter adapter = new shopListAdapter(getActivity(), shop);

                listView.setAdapter(adapter);
                filter(adapter);
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }

    });


}

private void filter(final shopListAdapter adapter) {
    searcher.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

            adapter.getFilter().filter(s.toString());
        }


        @Override
        public void afterTextChanged(Editable s) {

        }
    });
}

public class HairShop {

private String shopID;
private String name;
private String address;
private String image;
private String postCode;
private String description;
private String photoUri;
private String contNo;
private String email;
private Boolean isBusiness;

public HairShop(){

}
public HairShop(String shopID, String name, String address, String postCode, String contNo, String description, String photoUri,String email,Boolean isBusiness){
    this.shopID = shopID;
    this.name = name;
    this.address = address;
    this.photoUri = photoUri;
    this.postCode = postCode;
    this.contNo = contNo;
    this.description = description;
    this.email = email;
    this.isBusiness = isBusiness;
}
public String getPhotoUri(){
    return photoUri;
}
public void setPhotoUri(){
    this.photoUri = photoUri;
}

public Boolean getBusiness() {
    return isBusiness;
}

public void setBusiness(Boolean business) {
    isBusiness = business;
}

public void setShopID(String shopID) {
    this.shopID = shopID;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public void setAddress(String address) {
    this.address = address;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public void setPostCode(String postCode) {
    this.postCode = postCode;
}

public void setDescription(String description) {
    this.description = description;
}

public void setPhotoUri(String photoUri) {
    this.photoUri = photoUri;
}

public void setContNo(String contNo) {
    this.contNo = contNo;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getDescription(){

    return description;
}
public void setDescription(){
    this.description = description;
}
public String getShopID(){
    return shopID;
}
public void setShopID(){
    this.shopID = shopID;
}
public String getShopName(){
    return name;
}
public void setShopName(){
    this.name = name;
}
public String getAddress(){
    return address;
}
public void setAddress(){
    this.address = address;
}
public String getPostCode(){
    return postCode;
}
public void setPostCode(){
    this.postCode = postCode;
}
public String getContNo(){
    return contNo;
}
public void setContNo(){
    this.contNo = contNo;
}}

public class shopListAdapter extends BaseAdapter implements Filterable{
Context mContext;
LayoutInflater inflater;
private ArrayList<HairShop> filterShop = null;
private ArrayList<HairShop> shop;
private ShopFilter shopfilter = new ShopFilter();

public shopListAdapter(Context context,
                       ArrayList<HairShop> filterShop) {
    mContext = context;
    this.filterShop = filterShop;
    inflater = LayoutInflater.from(mContext);
    this.shop = new ArrayList<HairShop>();
    this.shop.addAll(filterShop);
    this.filterShop = filterShop ;
    this.shop = filterShop ;
}

@Override
public Filter getFilter() {
    if (shopfilter == null)
        shopfilter = new ShopFilter();

    return shopfilter;
}

public class ViewHolder {
    TextView name;
    TextView email;
    TextView postcode;

}

@Override
public int getCount() {
    return filterShop.size();
}

@Override
public HairShop getItem(int position) {
    return filterShop.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
        holder = new ViewHolder();
        convertView = inflater.inflate(R.layout.item, null);

        holder.name = (TextView) convertView.findViewById(R.id.txtName);
        holder.email = (TextView) convertView.findViewById(R.id.txtEmail);
        holder.postcode = (TextView) convertView.findViewById(R.id.postCodeID);


        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    // Set the results into TextViews
    holder.name.setText(filterShop.get(position).getName());
    holder.email.setText(filterShop.get(position).getAddress());
    holder.postcode.setText(filterShop.get(position).getPostCode());


  convertView.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View arg0) {

          Intent intent = new Intent(mContext, newsfeed.class);

          intent.putExtra("rank",
                  (filterShop.get(position).getAddress()));

          intent.putExtra("country",
                  (filterShop.get(position).getName()));

          intent.putExtra("population",
                  (filterShop.get(position).getEmail()));

          intent.putExtra("flag",
                  (filterShop.get(position).getPostCode()));

          mContext.startActivity(intent);
      }
  });

    return convertView;
}

private class ShopFilter extends Filter {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {

        String filterString = constraint.toString().toLowerCase();

        FilterResults results = new FilterResults();

        final ArrayList<HairShop> list = filterShop;

        int count = list.size();
        final ArrayList<HairShop> nlist = new ArrayList<>(count);

        String name ;

        for (int i = 0; i < count; i++) {
            HairShop shops = list.get(i);
            name = shops.getName();
            if (name.toLowerCase().contains(filterString)) {
                nlist.add(shops);
            }
        }


        results.values = nlist;
        results.count = nlist.size();

        return results;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        shop = (ArrayList<HairShop>) results.values;
        notifyDataSetChanged();
    }

}