it doesn't show the items in the recyclerviewer

Question

This is what I got when I make it.

The first thing this is the database and I don't know what exactly happen, but it is not work with me it doesn't show any data in the app.

And this is the code with every thing with it

package com.ta3am.ta3ami.ta3ami;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.squareup.picasso.Picasso;
import com.ta3am.ta3ami.ta3ami.Common.Common;
import com.ta3am.ta3ami.ta3ami.Interface.ItemClickListener;
import com.ta3am.ta3ami.ta3ami.Model.Category;
import com.ta3am.ta3ami.ta3ami.ViewHolder.MenuViewHolder;

public class Home extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    DatabaseReference ref;
    TextView txtFullName;
    RecyclerView recycler_menu;
    RecyclerView.LayoutManager layoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        toolbar.setTitle("Menu");
        setSupportActionBar(toolbar);

        //Init Firebase
        ref = FirebaseDatabase.getInstance().getReference("Category");

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
            }
        });

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        //Set Name for user
        View headerView = navigationView.getHeaderView(0);
        txtFullName = (TextView)headerView.findViewById(R.id.txtFullName);
        txtFullName.setText(Common.currentUser.getName());

        //Load menu
        recycler_menu =(RecyclerView)findViewById(R.id.recycler_menu);
        recycler_menu.setHasFixedSize(true);
        layoutManager = new LinearLayoutManager(this);
        recycler_menu.setLayoutManager(layoutManager);
        loadMenu();
    }

    private void loadMenu() {

       FirebaseRecyclerAdapter<Category,MenuViewHolder> adapter=new FirebaseRecyclerAdapter <Category, MenuViewHolder>(Category.class, R.layout.menu_item, MenuViewHolder.class, ref) {

           @Override
           protected void populateViewHolder(MenuViewHolder viewHolder, Category model, int position) {

                viewHolder.txtMenuName.setText(model.getName());
                Picasso.with(getBaseContext()).load(model.getImage()).into(viewHolder.imageView);
                final Category clickItem =model;
                viewHolder.setItemClickListener(new ItemClickListener() {
                    @Override
                    public void onClick(View view, int position, boolean isLongClick) {
                        Toast.makeText(Home.this, ""+clickItem.getName(), Toast.LENGTH_SHORT).show();
                    }
                });
           }
        };
        recycler_menu.setAdapter(adapter);
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.home, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.nav_menu) {
            // Handle the camera action
        } else if (id == R.id.nav_cart) {

        } else if (id == R.id.nav_orders) {

        } else if (id == R.id.nav_log_out) {

        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }
}

And the other thing about the other code is ViewHolder and so on

package com.ta3am.ta3ami.ta3ami.ViewHolder;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.ta3am.ta3ami.ta3ami.Interface.ItemClickListener;
import com.ta3am.ta3ami.ta3ami.R;

public class MenuViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    public TextView txtMenuName;
    public ImageView imageView;

    private ItemClickListener itemClickListener;

    public MenuViewHolder(View itemView) {
        super(itemView);

        txtMenuName =(TextView)itemView.findViewById(R.id.menu_name);
        imageView =(ImageView)itemView.findViewById(R.id.menu_image);

        itemView.setOnClickListener(this);
    }

    public void setItemClickListener(ItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    @Override
    public void onClick(View view){
        itemClickListener.onClick(view,getAdapterPosition(),false);
    }
}

And as I say there is noting here every thing seem to me good and work harmfully, but I don't know what is the wrong with the data

package com.ta3am.ta3ami.ta3ami.Model;

import android.net.Uri;
import android.widget.ImageView;

public class Category {
    private String Name;
    private String Image;

    public Category() {
    }

    public Category(String name, String image) {
        Name = name;
        Image = image;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public String getImage() {
        return Image;
    }

    public void setImage(String image) {
        Image = image;
    }
}

Syntax has been changed. Look at this https://stackoverflow.com/a/46964713/1042124 — Rahul, Oct 08 '18 at 06:04

score 0 · Answer 1 · answered Oct 08 '18 at 05:55

0

You have not set the layout manager to the adapter. Kindly set a Layout Manager as per your requirement. Like, adapter.setLayoutManager(new LinearLayoutManager(context)); and it shall work fine then.

answered Oct 08 '18 at 05:55

Insane Developer

1,014
10
19

score 0 · Answer 2 · answered Oct 08 '18 at 07:39

You have to update the syntax of the FirebaseRecyclerAdapter Update loadMenu() method.

private void loadMenu() {
            Query query = ref.limitToLast(10); // you can set data limit for how much data you want in list
            FirebaseRecyclerOptions dataoptions = new FirebaseRecyclerOptions.Builder<Category>().setQuery(query, Category.class).build();
            adapter=new FirebaseRecyclerAdapter <Category, MenuViewHolder>(dataoptions) {

                @Override
                protected void onBindViewHolder(MenuViewHolder viewHolder, Category model, int position) {
                    viewHolder.txtMenuName.setText(model.getName());
                    Picasso.with(getBaseContext()).load(model.getImage()).into(viewHolder.imageView);
                    final Category clickItem =model;
                    viewHolder.setItemClickListener(new ItemClickListener() {
                        @Override
                        public void onClick(View view, int position, boolean isLongClick) {
                            Toast.makeText(Home.this, ""+clickItem.getName(), Toast.LENGTH_SHORT).show();
                        }
                    });
                }
                @Override
                public MenuViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

                    View view = LayoutInflater.from(parent.getContext())
                            .inflate(R.layout.menu_item, parent, false);

                    return new MenuViewHolder(view);
                }

            };
            recycler_menu.setAdapter(adapter);
        }

After that you need to register adapter listener in OnStart() method of the your activity.

    @Override
    protected void onStart() {
        super.onStart();
        adapter.startListening();
    }

it doesn't show the items in the recyclerviewer

2 Answers2