hacer - Tire para actualizar recyclerview android

refresh listview android

Question

Hola, tengo una actividad de pestañas y, en la primera pestaña, busco datos del servidor y los muestro en una vista de reciclaje dentro de las vistas de tarjeta. Para obtener los datos del servidor, uso la biblioteca de voleas. Quiero implementar el Pull para actualizar para cargar los datos (así que cada vez que tire debe hacer la solicitud a la red). Y también quiero deshabilitar la solicitud de red cada vez que cambio entre pestañas (porque cuando cambio el enfoque de la pestaña en mi aplicación comienza a buscar datos) Quiero hacer la solicitud de red solo 1 vez (cuando el usuario inicia sesión por primera vez) y luego Otras solicitudes se manejan solo por tirar para actualizar.

Aquí está mi fragmento donde recyclerview y muestro los datos:

public class Tab1History extends Fragment
{

private RecyclerView recyclerView;
private CespiteAdapter adapter;
UserSessionManager session;

private static final String URL_DATA = "http://mydata.php";

private List<CespiteOgg> cespiteOggList;

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

    View rootView = inflater.inflate(R.layout.tab1history, container, false);

    recyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
    recyclerView.setHasFixedSize(true);//every item of the RecyclerView has a fix size
    recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

    cespiteOggList = new ArrayList<>();

    loadRecyclerViewData();

            return rootView;
}

private void loadRecyclerViewData()
{
    // Session class instance
    session = new UserSessionManager(getActivity());
    //get user data from session
    HashMap<String, String> user = session.getUserDetails();
    //get name
    String name = user.get(UserSessionManager.KEY_NAME);
    // get username
    final String usernameUtente = user.get(UserSessionManager.KEY_USERNAME);

    final ProgressDialog progressDialog = new ProgressDialog(getActivity());
    progressDialog.setMessage("Carimento dati...");
    progressDialog.show();

    StringRequest stringRequest = new StringRequest(Request.Method.POST,
            URL_DATA,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String s) {
                    progressDialog.dismiss();
                    try {
                        JSONObject jsonObject = new JSONObject(s);
                        JSONArray array = jsonObject.getJSONArray("dates");

                        for(int i=0; i<array.length(); i++)
                        {
                            JSONObject o = array.getJSONObject(i);
                            CespiteOgg item = new CespiteOgg(
                                    o.getString("CodNumInventario"),
                                    o.getString("Nome"),
                                    o.getString("DtCatalogazione"),
                                    o.getString("CodIdA"),
                                    o.getString("username")
                            );
                            cespiteOggList.add(item);
                        }

                        adapter = new CespiteAdapter(cespiteOggList, getActivity());
                        recyclerView.setAdapter(adapter);

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    progressDialog.dismiss();
                }
            })
            {
                @Override
                protected Map<String, String> getParams() throws AuthFailureError {
                    Map<String, String> params = new HashMap<String, String>();
                    params.put("Username", usernameUtente);
                    return params;
                }
            };

    RegisterRequest.getmInstance(getActivity()).addToRequestque(stringRequest);

}
}

Y es el adaptador:

public class CespiteAdapter extends RecyclerView.Adapter<CespiteAdapter.ViewHolder>
{


private List<CespiteOgg> cespiteOggList;
private Context context;

public CespiteAdapter(List<CespiteOgg> cespiteOggList, Context context) {

    this.cespiteOggList = cespiteOggList;
    this.context = context;
}

public class ViewHolder extends RecyclerView.ViewHolder
{

    public CardView cv;
    public TextView txtNumInventario;
    public TextView txtNomeCespite;
    public TextView txtDtCatalogazione;
    public TextView txtAula;
    public TextView txtNomeUser;


    ViewHolder(View itemView)
    {

        super (itemView);
        //cv = (CardView) itemView.findViewById(R.id.cardView);
        txtNumInventario = (TextView) itemView.findViewById(R.id.txtNumeroInventario);
        txtNomeCespite = (TextView) itemView.findViewById(R.id.txtNomeCespite);
        txtDtCatalogazione = (TextView) itemView.findViewById(R.id.txtDataCatalogazione);
        txtAula = (TextView) itemView.findViewById(R.id.txtAula);
        txtNomeUser= (TextView) itemView.findViewById(R.id.txtNomeUser);


    }
}



@Override
public CespiteAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{

    LayoutInflater inflater = LayoutInflater.from(parent.getContext());

    View cespiteView = inflater.inflate(R.layout.cespite_card_view, parent, false);

    return new ViewHolder(cespiteView);
}

@Override
public void onBindViewHolder(ViewHolder holder, int position)
{

    CespiteOgg cespiteOgg = cespiteOggList.get(position);

    holder.txtNumInventario.setText(cespiteOgg.getNumInventario());
    holder.txtNomeCespite.setText(cespiteOgg.getNomeCespite());
    holder.txtDtCatalogazione.setText(cespiteOgg.getDtCatalogazione());
    holder.txtAula.setText(cespiteOgg.getAula());
    holder.txtNomeUser.setText(cespiteOgg.getNomeUser());

}

@Override
public int getItemCount()
{

    return cespiteOggList.size();
}

}

Answer 1

Android tiene un widget SwipeToRefresh para hacer esto.

Esta pregunta ha sido respondida anteriormente aquí, how-to-implement-pull-down-refresh-in-android y how-to-implement-android-pull-to-refresh

Answer 2

Ejemplo de Pull to Refresh ListView & RecyclerView en Android Studio - SwipeRefreshLayout. Espero que este código funcione correctamente. Puede probar este código.

Código XML básico de Pull to Refresh / SwipeRefreshLayout:

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/simpleSwipeRefreshLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        < Add View''s Here..../>
</android.support.v4.widget.SwipeRefreshLayout>

A continuación, puede descargar el código, ver el resultado final y una explicación paso a paso del ejemplo básico de recuperación para actualizar. obtenga el código completo con el ejemplo https://abhiandroid.com/materialdesign/pulltorefresh

Answer 3

Puedes usar el widget developer.android.com/training/swipe/add-swipe-interface.html Android en lugar de ProgressDialog .

Siga los pasos a continuación para integrar SwipeRefreshLayout en su fragmento de la Tab1history :

1. En tu tab1history diseño, agrega SwipeRefreshLayout como diseño raíz y coloca RecyclewrView en su interior.

// tab1history.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swipe_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/my_recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

</android.support.v4.widget.SwipeRefreshLayout>

2. En su fragmento Tab1History , use SwipeRefreshLayout como se muestra a continuación para cargar datos desde el servidor:

// Tab1History.java
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;


public class Tab1History extends Fragment implements SwipeRefreshLayout.OnRefreshListener {

    SwipeRefreshLayout mSwipeRefreshLayout;
    private RecyclerView recyclerView;
    private CespiteAdapter adapter;
    UserSessionManager session;

    private static final String URL_DATA = "http://mydata.php";

    private List<CespiteOgg> cespiteOggList;

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

        View rootView = inflater.inflate(R.layout.tab1history, container, false);


        recyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
        recyclerView.setHasFixedSize(true);//every item of the RecyclerView has a fix size
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        cespiteOggList = new ArrayList<>();


        // SwipeRefreshLayout
        mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_container);
        mSwipeRefreshLayout.setOnRefreshListener(this);
        mSwipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary,
                android.R.color.holo_green_dark,
                android.R.color.holo_orange_dark,
                android.R.color.holo_blue_dark);

        /**
         * Showing Swipe Refresh animation on activity create
         * As animation won''t start on onCreate, post runnable is used
         */
        mSwipeRefreshLayout.post(new Runnable() {

            @Override
            public void run() {

                mSwipeRefreshLayout.setRefreshing(true);

                // Fetching data from server
                loadRecyclerViewData();
            }
        });

        return rootView;
    }

    /**
     * This method is called when swipe refresh is pulled down
     */
    @Override
    public void onRefresh() {

        // Fetching data from server
        loadRecyclerViewData();
    }

    private void loadRecyclerViewData()
    {
        // Showing refresh animation before making http call
        mSwipeRefreshLayout.setRefreshing(true);

        // Session class instance
        session = new UserSessionManager(getActivity());
        //get user data from session
        HashMap<String, String> user = session.getUserDetails();
        //get name
        String name = user.get(UserSessionManager.KEY_NAME);
        // get username
        final String usernameUtente = user.get(UserSessionManager.KEY_USERNAME);


        StringRequest stringRequest = new StringRequest(Request.Method.POST,
                URL_DATA,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String s) {

                        try {
                            JSONObject jsonObject = new JSONObject(s);
                            JSONArray array = jsonObject.getJSONArray("dates");

                            for(int i=0; i<array.length(); i++)
                            {
                                JSONObject o = array.getJSONObject(i);
                                CespiteOgg item = new CespiteOgg(
                                        o.getString("CodNumInventario"),
                                        o.getString("Nome"),
                                        o.getString("DtCatalogazione"),
                                        o.getString("CodIdA"),
                                        o.getString("username")
                                );
                                cespiteOggList.add(item);
                            }

                            adapter = new CespiteAdapter(cespiteOggList, getActivity());
                            recyclerView.setAdapter(adapter);

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                        // Stopping swipe refresh
                        mSwipeRefreshLayout.setRefreshing(false);

                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                        // Stopping swipe refresh
                        mSwipeRefreshLayout.setRefreshing(false);
                    }
                })
        {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                params.put("Username", usernameUtente);
                return params;
            }
        };

        RegisterRequest.getmInstance(getActivity()).addToRequestque(stringRequest);

    }
}

Espero que esto funcione correctamente.

Answer 4

Código fuente

https://drive.google.com/open?id=1qjJ_to-1knVNaJB4T3U_L_p_YYNvgAeZ

APK

https://drive.google.com/open?id=1MxQZwjIXgR2jgDkUW1mbFrTLMSaQQisC

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {


    SwipeRefreshLayout mSwipeRefreshLayout;


        // SwipeRefreshLayout
        mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container);

        mSwipeRefreshLayout.setOnRefreshListener(this);
//        mSwipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary,
        mSwipeRefreshLayout.setColorSchemeResources(R.color.colorAccent,
                android.R.color.holo_green_dark,
                android.R.color.holo_orange_dark,
                android.R.color.holo_blue_dark);

        /**
         * Showing Swipe Refresh animation on activity create
         * As animation won''t start on onCreate, post runnable is used
         */
        mSwipeRefreshLayout.post(new Runnable() {

            @Override
            public void run() {

                if(mSwipeRefreshLayout != null) {
                    mSwipeRefreshLayout.setRefreshing(true);
                }
                // TODO Fetching data from server
                fetchContacts();
            }
        });



  @Override
    public void onRefresh() {
        fetchContacts();
    }