Sort a FirebaseRecyclerAdapter

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Sort a FirebaseRecyclerAdapter

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#1 by (1 votes)

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Hello, I'm doing an app that shows the days of the week from FireBase, the problem is that I have messy and I want to be ordered.

I have searched in many places and they put in order with the sort method of the adapter:

link

The problem is that I can not use this method because I use a FirebaseRecyclerAdapter from this library , which is derived from a Adapter, which does not have the sort method.

In the end I was able to sort the data of the adapter but when I show it only the last element is shown and the previous ones do not. I put the code:

The adapter:

public class MyFireAdapterDiasFiestaRecyclerView extends FirebaseRecyclerAdapter<DiaFiestaMeta, MyFireAdapterDiasFiestaRecyclerView.MyFireViewHolder>
    implements View.OnClickListener {
private View.OnClickListener listener;
private List<DiaFiestaMetaFecha> dias;
private static List<TextView> views ;
private DiaFiestaMetaFecha fechaDia;

public MyFireAdapterDiasFiestaRecyclerView(Class<DiaFiestaMeta> modelClass, int modelLayout, Class<MyFireViewHolder> viewHolderClass, DatabaseReference ref) {
    super(modelClass, modelLayout, viewHolderClass, ref);
    dias = new ArrayList<>();
    views = new ArrayList<>();

}

@Override
public MyFireViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
    View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fila_diasfiesta_layout, viewGroup, false);
    itemView.setOnClickListener(this);
    MyFireViewHolder holder = new MyFireViewHolder(itemView);
    return holder;
}

public void setOnClickListener(View.OnClickListener listener) {
    this.listener = listener;
}

@Override
public void onClick(View view) {
    if (listener != null)
        listener.onClick(view);
}

@Override
protected void populateViewHolder(MyFireViewHolder viewHolder, DiaFiestaMeta modelo, int position) {
    fechaDia = new DiaFiestaMetaFecha(modelo.getUidDiaFiesta(), modelo.getTituloDiaFiesta());
    dias.add(fechaDia);
    if (this.getItemCount() == position + 1) {
        viewHolder.bindDatos(dias);
    }
}

public static class MyFireViewHolder extends RecyclerView.ViewHolder {
    private TextView textoTv;
    private int num;



    public MyFireViewHolder(View itemView) {
        super(itemView);
        textoTv = (TextView) itemView.findViewById(R.id.tvTituloDiaFiesta);

        views.add(textoTv);

    }

    public void bindDatos(String titulo) {
        textoTv.setText(titulo);
    }

    public void bindDatos(List<DiaFiestaMetaFecha> dias) {
        burbuja(dias);
        for (int i = 0; i < dias.size(); i++) {
            views.get(i).setText(dias.get(i).getTituloDiaFiesta());
        }
    }


}

}

And the Fragment where I use it:

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    uidsFiestas = getUidsFiestas();
    //Por defecto mostramos la ultima fecha
    uidFiestaSeleccionada = getUltimaFiesta();
    adaptadorFiestas = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item, uidsFiestas);
    //Ponemos el uidFiestaSeleccionada el primero para que nos lo muestre
    adaptadorFiestas.remove(uidFiestaSeleccionada);
    adaptadorFiestas.insert(uidFiestaSeleccionada,0);
    mDataBaseDiasFiestaSelRef = mDataBaseFiestasRef.child(uidFiestaSeleccionada).child("diasFiestas");
    adaptadorDiasFiestas = new MyFireAdapterDiasFiestaRecyclerView(DiaFiestaMeta.class, R.layout.fila_diasfiesta_layout, MyFireAdapterDiasFiestaRecyclerView.MyFireViewHolder.class, mDataBaseDiasFiestaSelRef);
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fiestas_layout, container, false);

    ButterKnife.bind(this, view);
    spFiestas.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            TextView textoTv = (TextView) view;
            uidFiestaSeleccionada = textoTv.getText().toString();
            //fiestaSeleccionada = crearFiesta(uidFiestaSeleccionada);
            mDataBaseDiasFiestaSelRef = mDataBaseFiestasRef.child(uidFiestaSeleccionada).child("diasFiestas");
            adaptadorDiasFiestas = new MyFireAdapterDiasFiestaRecyclerView(DiaFiestaMeta.class, R.layout.fila_diasfiesta_layout, MyFireAdapterDiasFiestaRecyclerView.MyFireViewHolder.class, mDataBaseDiasFiestaSelRef);
            adaptadorViejoDiasFiestas = (MyFireAdapterDiasFiestaRecyclerView) recView.getAdapter();
            recView.setAdapter(adaptadorDiasFiestas);

            if (adaptadorViejoDiasFiestas!=null)
                adaptadorViejoDiasFiestas.cleanup();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
        }
    });
    spFiestas.setAdapter(adaptadorFiestas);
    setHasOptionsMenu(true);

    recView.setHasFixedSize(true);
    manager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
    recView.setLayoutManager(manager);
    recView.setAdapter(adaptadorDiasFiestas);
    return view;
}

Thank you!

java android firebase

asked by JaviDonisio2 22.02.2017 в 20:10

source

1 answer

Show columns that have SQL SERVER value Error after "run app" in android studio [duplicated]

score 1 · Accepted Answer

To solve the problem with the ordering of your adapter, you have to check the inheritance of your adapter: I assume that you use com.example.matteo.firebase_recycleview.FirebaseRecyclerAdapter (let me know if I'm wrong please).

This class extends the RecyclerViewAdapter , and implements some methods to manipulate the data within the apdapter, but even more important is the way it internally stores the views and its keys. If you check the code here , you realize that this implementation saves the views and keys to the views in lists of type ArrayList . That means that if you do not want to destroy the relationship between the views and their keys, you will have to implement the ordering step by step, so as not to lose the linking of the indices. As you realize, not a particularly efficient job.

So my recommendation is the following:

implement DiaFiestaMeta with a getKey() method that allows you to generate the key from your item.
implements the interface Comparable for DiaFiestaMeta
implement a ordenar method on your adapter that uses Collections.sort(List<T> lista) to sort the data, then generate the keys and call notifyDataSetChanged() to update the view.

Your method ordenar() should end up being:

public void ordenar(){
    Collections.sort(getItems());
    ArrayList<String> keys = getKeys();
    for (int i = 0; i<getItems.size(); i++){
         keys.set(i, getItems().getKey());
    }
    notifyDataSetChanged();
}

Any questions with the implementation, do not hesitate to ask for comment.