Android RecyclerView Firebase Fragment

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Android RecyclerView Firebase Fragment

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#2 by (0 votes)
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Good afternoon, I am developing an app with tabs and fragments, The problem I have is that when I start the app the recyclerView that is inside a fragment does not show me anything at the beginning, but if I move to the last tabs and I go back to the tab that has the recyclerView just there is like reacts, I send the code to see if you can help me

This is the one that loads the tabs and fragments

 package com.example.juego.frasear.activities;

import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.widget.TextView;

import com.example.juego.frasear.R;
import com.example.juego.frasear.adapters.adapterPrincipal;
import com.example.juego.frasear.fragments.homeFragment;
import com.example.juego.frasear.fragments.jugadoresFragment;
import com.example.juego.frasear.fragments.perfilFragment;
import com.example.juego.frasear.fragments.rankingFragment;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

/**
 * Created by franco on 26/08/16.
 */
public class principal extends AppCompatActivity {






    private Toolbar toolbar,toolbarJugadores,toolbarMiPerfil;
    private TabLayout tabLayout;
    private TextView toolbar_title,toolbarJug_title,
            toolbarMiPerfil_title;
    //  that will host the section contents.
    private ViewPager viewPager;
    private Typeface font_roboto_light,font_bigboss,font_frase_menu,font_gametime;
    String email_usuario;
    //controlador c=new controlador();


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

        font_gametime = Typeface.createFromAsset(getAssets(), "fonts/Game_Time.ttf");
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        //toolbar.setTitle("Frasear");
        toolbar_title = (TextView) findViewById(R.id.toolbar_title);
        toolbar_title.setTypeface(font_gametime);
        toolbar.hideOverflowMenu();
        setSupportActionBar(toolbar);


        FirebaseUser user= FirebaseAuth.getInstance().getCurrentUser();
        if(user==null)
        {
            irAlogin();
        }
        if(user!=null) {

           // Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          //  setSupportActionBar(toolbar);


            //getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            // Create the adapter that will return a fragment for each of the three
            // primary sections of the activity.
            // sectionsPagerAdapter that is used as the adapter for a ViewPager.

            // Set up the ViewPager with the sections adapter.
            viewPager = (ViewPager) findViewById(R.id.viewpager);
     //      viewPager.addOnPageChangeListener(pagerChangeListener());

            setupViewPager(viewPager);


            tabLayout = (TabLayout) findViewById(R.id.tabs);
            // tabLayout.setupWithViewPager(viewPager);

            tabLayout.setupWithViewPager(viewPager);

            setupTabIcons();

        }
    }  // fin oncreate

    private void irAlogin()
    {
        Intent intent = new Intent(this, login.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }

    private void setupTabIcons() {

        TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
        tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.icono_home, 0, 0);
        tabLayout.getTabAt(0).setCustomView(tabOne);

        TextView tabTwo = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);

        tabTwo.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.icono_jugadores, 0, 0);
        tabLayout.getTabAt(1).setCustomView(tabTwo);

        TextView tabThree = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);

        tabThree.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.icono_ranking, 0, 0);
        tabLayout.getTabAt(2).setCustomView(tabThree);

        TextView tabFour = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);

        tabFour.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.icono_perfil, 0, 0);
        tabLayout.getTabAt(3).setCustomView(tabFour);
    }

    private void setupViewPager(ViewPager viewPager) {
        adapterPrincipal adapter = new adapterPrincipal(getSupportFragmentManager());
        //ViewPagerAdapter adapter =new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new homeFragment(),"HOME" );
        adapter.addFragment(new jugadoresFragment(), "PLAYERS");
        adapter.addFragment(new rankingFragment(), "RANKING");
        adapter.addFragment(new perfilFragment(), "PERFIL");
        // mostrarToolbarsHome();
        //adapter.esconderToolbars();
        viewPager.setAdapter(adapter);
    }




   /* public ViewPager.OnPageChangeListener pagerChangeListener() {
        return new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                if(tabLayout.getTabAt(1).isSelected()) {
                    jugadoresFragment j =new jugadoresFragment();

                }

            }
            @Override
            public void onPageSelected(int position) {

               if(tabLayout.getTabAt(1).isSelected()) {

                   jugadoresFragment j =new jugadoresFragment();


               }

            }
            @Override
            public void onPageScrollStateChanged(int state) {
            }
        };

    }*/


  /*  public void mostrarToolbarsHome() {
       toolbarJugadores.setVisibility(View.GONE);
        toolbarMiPerfil.setVisibility(View.GONE);
        toolbar.setVisibility(View.VISIBLE);
    }

    public void mostrarToolbarsJugadores()
    {
        toolbarJugadores.setVisibility(View.VISIBLE);
        toolbarMiPerfil.setVisibility(View.GONE);
        toolbar.setVisibility(View.GONE);
    }
    public void mostrarToolbarMiPerfil()
    {
        toolbarMiPerfil.setVisibility(View.VISIBLE);
        toolbarJugadores.setVisibility(View.GONE);
        toolbar.setVisibility(View.GONE);
    }


*/
}

Then we have the fragment of the recyclerView

package com.example.juego.frasear.fragments;

import android.os.Bundle;
import android.support.v4.app.Fragment;
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.example.juego.frasear.R;
import com.example.juego.frasear.adapters.recyclerAdapter;
import com.example.juego.frasear.models.controlador;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

import java.util.ArrayList;

/**
 * Created by franco on 27/08/16.
 */
public class jugadoresFragment extends Fragment {

    FirebaseUser user= FirebaseAuth.getInstance().getCurrentUser();
   //ArrayAdapter<String> adaptadorListaAmigos;
     controlador c;
    //principal p;
   // DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
    ArrayList<String> listaNombres;
    ArrayList<String> listaUrl;
    RecyclerView recyclerView;
    //DataSnapshot data;
    //private SwipeRefreshLayout refreshLayout;



    public jugadoresFragment() {
        c=new controlador();
        // Required empty public constructor
        //c.getNombreAsyncronicos();




}

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        listaNombres=c.getAmigosNombres(user.getEmail());
        listaUrl=c.getAmigosUrl(user.getEmail());
        String hola="hola";
    //leadsNames=c.getAmigos();
    }


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

        recyclerView = (RecyclerView) v.findViewById(R.id.recycler_view);

            //recyclerView.setHasFixedSize(true);
            recyclerView.setNestedScrollingEnabled(false);
            LinearLayoutManager llmanager = new LinearLayoutManager(v.getContext());
            llmanager.setOrientation(LinearLayoutManager.VERTICAL);
            recyclerView.setLayoutManager(llmanager);


            recyclerAdapter myAdapter = new recyclerAdapter(v.getContext(),listaNombres,listaUrl);
            myAdapter.notifyDataSetChanged();
            recyclerView.setAdapter(myAdapter);


        return v;
    }


    }

Then the recyclerView class

package com.example.juego.frasear.adapters;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.juego.frasear.R;

import java.util.ArrayList;

import jp.wasabeef.glide.transformations.CropCircleTransformation;

/**
 * Created by franco on 12/09/16.
 */
public class recyclerAdapter extends RecyclerView.Adapter<recyclerAdapter.MyViewHolder> {

    private ArrayList<String> items;
    private Context context;
    private ArrayList<String> imagenes;

    public recyclerAdapter(Context context, ArrayList<String> items,ArrayList<String> imagenes) {
        this.context = context;
        this.items= items;
        this.imagenes=imagenes;
    }

    @Override
    public int getItemCount() {
        return items.size();
    }



    @Override
    public void onBindViewHolder(MyViewHolder itemsViewHolder, int i) {
        itemsViewHolder.vTitle.setText(items.get(i));;
        Glide.with(this.context).load(imagenes.get(i))
                .bitmapTransform(new CropCircleTransformation(context))
                .into(itemsViewHolder.vImagen);

    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.
                from(viewGroup.getContext()).
                inflate(R.layout.fragment_recyclerview, viewGroup, false);

        return new MyViewHolder(itemView);
    }

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        // Campos de la lista
        public TextView vTitle;
       public ImageView vImagen;

        public MyViewHolder(View v) {
            super(v);
            vTitle = (TextView) v.findViewById(R.id.title);
            vImagen= (ImageView) v.findViewById(R.id.imagenAmigos);
        }
    }

}

Then I have the driver class

public ArrayList<String> getAmigosNombres(String email)
    {
        catalogo_amigos cat=new catalogo_amigos();
        ArrayList<String> rtas=cat.getAmigosNombres(email);
        //String hola="asdsa";
        return rtas;
    }

    public ArrayList<String> getAmigosUrl(String email)
    {
        catalogo_amigos cat=new catalogo_amigos();
        ArrayList<String> rtas=cat.getAmigosUrl(email);
        return rtas;
    }

    public void guardarAmigos(ArrayList<amigo> listaAmigos,String email)
    {
        catalogo_amigos cat=new catalogo_amigos();
        cat.guardarAmigos(listaAmigos,email);
    }

    public void getNombreAsyncronicos()
    {
        catalogo_asynco a=new catalogo_asynco();
        AsyncTask<String, Void, ArrayList<String>> array=a.execute("[email protected]");
        try {
            ArrayList<String> as= array.get();
            String hola="hola";
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }
}

then I have the class catalogo_amigos that is where the interaction with firebase

package com.example.juego.frasear.databases;

import android.os.Handler;

import com.example.juego.frasear.models.amigo;
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;

import java.util.ArrayList;
import java.util.Iterator;

/**
 * Created by franco on 16/09/16.
 */
public class catalogo_amigos  {

    DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
    ArrayList<String> listaNombres = new ArrayList<>();
    ArrayList<String> listaUrl = new ArrayList<>();
    Long nro;
    Handler mhandler,mhandler1;


    public catalogo_amigos()
    {
            mhandler=new Handler();
            mhandler1=new Handler();

    }


    public void guardarAmigos(ArrayList<amigo> lista, String email) {
        ArrayList<String> lista_name = new ArrayList<>();
        ArrayList<String> lista_url = new ArrayList<>();
        String delimitadores = "@";
        String[] emailCortado = email.split(delimitadores);
       /*for(int i=0;i<lista.size();i++)
        {
            amigo a=lista.get(i);
            lista_name.add(i,a.getName());
        }
        //String nro=String.valueOf(i);
        DatabaseReference amig = ref.child("amigos").child(emailCortado[0]);;
        amig.setValue(lista_name);
        for(int i=0;i<lista.size();i++)
        {
            amigo a=lista.get(i);
            lista_url.add(i,a.getUrl());
        }
        DatabaseReference url = ref.child("imagenes_amigos").child(emailCortado[0]);
        url.setValue(lista_url);
*/
        DatabaseReference am = ref.child("amigos").child(emailCortado[0]);
        am.setValue(lista);

    }


    public ArrayList<String> getAmigosNombres(final String email) {


                //Aquí ejecutamos nuestras tareas costosas


        String delimitadores = "@";
        String[] emailCortado = email.split(delimitadores);
        DatabaseReference amigos = ref.child("amigos").child(emailCortado[0]);
        amigos.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                Iterable<DataSnapshot> i = dataSnapshot.getChildren();
                Iterator<DataSnapshot> radiatosIterator = i.iterator();
                while (radiatosIterator.hasNext()) {
                    DataSnapshot c = radiatosIterator.next().child("name");
                    String name = c.getValue(String.class);
                    listaNombres.add(name);

                }


            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }

        });

        return listaNombres;

    }

    public ArrayList<String> getAmigosUrl(final String email) {


        mhandler1.post(new Runnable() {
            @Override
            public void run() {

                String delimitadores = "@";
                String[] emailCortado = email.split(delimitadores);
                DatabaseReference amigos = ref.child("amigos").child(emailCortado[0]);
                amigos.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        Iterable<DataSnapshot> i = dataSnapshot.getChildren();
                        Iterator<DataSnapshot> radiatosIterator = i.iterator();
                        while (radiatosIterator.hasNext()) {
                            DataSnapshot c = radiatosIterator.next().child("url");
                            String url = c.getValue(String.class);
                            listaUrl.add(url);
                        }
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });
            }
            });

        return listaUrl;
    }

}

I am also doubting that the tabs are wrong, this would be the adapter where the tabs are loaded

package com.example.juego.frasear.adapters;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;

import java.util.ArrayList;
import java.util.List;

public class adapterPrincipal extends FragmentStatePagerAdapter {


    public adapterPrincipal(FragmentManager fm)
    {
        super(fm);

    }

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();




    @Override
    public Fragment getItem(int position)
    {

        return mFragmentList.get(position);

    }

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

    public void addFragment(Fragment fragment,String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }


}

Thank you very much.

android firebase android-fragment recyclerview

asked by Franco Londra 23.09.2016 в 17:26

source

3 answers

Rename computer with SQL 7 installed I try to log users with password encrypted with hash, using password_verify [duplicate]

score 1 · Answer 1

You could try this solution in your setupViewPager

viewPager.setOffscreenPageLimit(NumeroDeTabsQueTengas);

Set the number of pages that should be retained on either side of the current page in the view hierarchy in an inactive state. Pages beyond this limit will be created from the adapter when necessary.

the minimum value is 1

score 0 · Answer 2

What happens is that getAmigosNombres and getAmigoUrls are asynchronous. When loading the adapter the first time, the notifyDataSetChanged is called before the Firebase response arrives. And when the answer finally arrives, the adapter is not refreshed (only the items are added to the list). That is why after browsing the tabs, the results appear, since the RecyclerView re-renders its contents.

The direct way to solve it is to call notifyDataSetChanged after updating the content.

@Override
public void onDataChange(DataSnapshot dataSnapshot) {
    Iterable<DataSnapshot> i = dataSnapshot.getChildren();
    Iterator<DataSnapshot> radiatosIterator = i.iterator();
    while (radiatosIterator.hasNext()) {
        DataSnapshot c = radiatosIterator.next().child("url");
        String url = c.getValue(String.class);
        listaUrl.add(url);
    }

    // Luego de actualizar el listado se debe notificar al adapter
}

As you probably do not want to do notifyDataSetChanged within the controller, you may prefer in this context to pass a callback to getAmigosNombres (which would receive the result of the call to firebase), and call notify within that callback. But that is already a matter of design that will be at your discretion.

score -1 · Answer 3

The same thing happened to me, but I solved it in this line that has:

LinearLayoutManager llmanager = new LinearLayoutManager(v.getContext());

I changed it for

LinearLayoutManager llmanager = new LinearLayoutManager(getActivity());

getActivity() gets the context of the activity since the fragment does not have its own context.