Filter.class

package com.rahulmishra.sarasmelaapp.activites;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.GenericTypeIndicator;
import com.google.firebase.database.ValueEventListener;
import com.mancj.materialsearchbar.MaterialSearchBar;
import com.rahulmishra.sarasmelaapp.R;
import com.rahulmishra.sarasmelaapp.Utils.GridAutoFitLayoutManager;
import com.squareup.picasso.Callback;
import com.squareup.picasso.MemoryPolicy;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import com.google.firebase.database.DatabaseReference;
import com.wang.avi.AVLoadingIndicatorView;

public class CategoryActivity extends AppCompatActivity {

    TextView category_title;
    Button category_filter;
    MaterialSearchBar categorySearchBar;
    RecyclerView.Adapter productsRecyclerAdapter;
    private DatabaseReference mDatabase;
    private ProgressDialog progressDialog;
    List<ProductEntity> productList;
    RecyclerView products;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_category);
        Intent intent = getIntent();
        category_title = findViewById(R.id.category_title);
        category_title.setText(intent.getStringExtra("title"));

        productList = new ArrayList<>();

        progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("Please wait...");
        progressDialog.show();

        products = findViewById(R.id.product_catalog);

        mDatabase = FirebaseDatabase.getInstance().getReference("products");
        mDatabase.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot snapshot) {
                progressDialog.dismiss();

                for (DataSnapshot postSnapshot : snapshot.getChildren()) {
                    ProductEntity upload = postSnapshot.getValue(ProductEntity.class);
                    Log.d("error", "onDataChange: " + upload.about);

                    List<ProductImage> images = new ArrayList<>() ;
                    for(DataSnapshot datas : postSnapshot.child("images").getChildren()){

                        ProductImage upload_image = datas.getValue(ProductImage.class);
                        images.add(upload_image) ;
                    }
                    upload.image = images ;
                    productList.add(upload);
                }

                GridAutoFitLayoutManager layoutManager = new GridAutoFitLayoutManager(getBaseContext(), 240);
                products.setLayoutManager(layoutManager);
                products.setNestedScrollingEnabled(false);
                productsRecyclerAdapter = new ProductsRecyclerAdapter(productList, CategoryActivity.this);
                products.setAdapter(productsRecyclerAdapter);
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                NestedScrollView root_layout = findViewById(R.id.category_root_layout);
                Snackbar.make(root_layout, "Internal Error!!", Snackbar.LENGTH_SHORT).show();
            }
        });

        category_filter = findViewById(R.id.category_filter);
        category_filter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PopupMenu popupMenu = new PopupMenu(CategoryActivity.this, category_filter);
                popupMenu.getMenuInflater().inflate(R.menu.filter_menu, popupMenu.getMenu());
                popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        Collections.sort(productList, new Comparator<ProductEntity>() {
                            @Override
                            public int compare(ProductEntity lhs, ProductEntity rhs) {
                                return lhs.about.compareTo(rhs.about);
                            }
                        });
                        productsRecyclerAdapter.notifyDataSetChanged();
                        return true;
                    }
                });
                popupMenu.show();
            }
        });

        categorySearchBar = findViewById(R.id.categorySearchBar);
        categorySearchBar.addTextChangeListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                //// TODO: 09-11-2017
                // send the entered text to our filter and let it manage everything
                productsRecyclerAdapter.getFilter().filter(categorySearchBar.getText());
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.bar_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.cart:
                Intent intent = new Intent(CategoryActivity.this, Wishlist.class);
                startActivity(intent);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

//    void feed_data() {
//        final List<ProductEntity> feededProducts = new ArrayList<>();


//        feededProducts.add(new ProductEntity(10001, "Marble Chowki pair with intricate floral Painting by Handicrafts Paradise",
//                "09171430513",
//                "Rajasthan Handicraft And Textiles, Opposite Dada Bari, amer, Sagar Rd, Devisinghpura, Rajasthan 302028",
//                "Handicraft",
//                new ArrayList<ProductImage>() {{
//                    add(new ProductImage("https://firebasestorage.googleapis.com/v0/b/sarasmelaapp.appspot.com/o/products_images%2Fgramophone.jpg?alt=media&token=8a5cb8a1-4786-4d1b-b5cc-1072de9331de"));
//                    add(new ProductImage("https://firebasestorage.googleapis.com/v0/b/sarasmelaapp.appspot.com/o/products_images%2Fgramophone1.jpg?alt=media&token=6992be5f-2153-4cc5-89ef-1e36850ae21f"));
//                }}, "Stall No. 4, Saras Mela, Patna"
//        )) ;
//        feededProducts.add(new ProductEntity(10002, "Generic ITOS365 Handmade Vintage Dummy Gramophone Only For Home Décor",
//                "01412630837",
//                "Near Rmgarh Turn, Amber Road, Sanganeer, Amber Road, Jaipur, Rajasthan 302002",
//                "Handicraft",
//                new ArrayList<ProductImage>() {{
//                    add(new ProductImage("https://firebasestorage.googleapis.com/v0/b/sarasmelaapp.appspot.com/o/products_images%2Fchowki.jpg?alt=media&token=a74bf78e-f5ad-410c-aa28-9cbcacf386c4"));
//                    add(new ProductImage("https://firebasestorage.googleapis.com/v0/b/sarasmelaapp.appspot.com/o/products_images%2Fchowki1.jpg?alt=media&token=f91b064f-98fa-4504-91ff-ef56b43ab1fc"));
//                }}, "Stall No. 56, Saras Mela, Patna"
//            )) ;

//    }
}

class ProductEntity implements Parcelable {
    int id;
    String about;
    String contact_vendor;
    String vendor_address;
    String category;
    List<ProductImage> image;
    public String shop_location;

    public ProductEntity(int id, String about, String contact_vendor,
                         String vendor_address, String category, ArrayList<ProductImage> image, String shop_location) {
        this.id = id;
        this.about = about;
        this.contact_vendor = contact_vendor;
        this.vendor_address = vendor_address;
        this.category = category;
        this.image = image;
        this.shop_location = shop_location;
    }

    public ProductEntity() {
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(this.id);
        dest.writeString(this.about);
        dest.writeString(this.contact_vendor);
        dest.writeString(this.vendor_address);
        dest.writeString(this.category);
        dest.writeTypedList(this.image);
        dest.writeString(this.shop_location);
    }

    protected ProductEntity(Parcel in) {
        this.id = in.readInt();
        this.about = in.readString();
        this.contact_vendor = in.readString();
        this.vendor_address = in.readString();
        this.category = in.readString();
        this.image = in.createTypedArrayList(ProductImage.CREATOR);
        this.shop_location = in.readString();
    }

    public static final Creator<ProductEntity> CREATOR = new Creator<ProductEntity>() {
        @Override
        public ProductEntity createFromParcel(Parcel source) {
            return new ProductEntity(source);
        }

        @Override
        public ProductEntity[] newArray(int size) {
            return new ProductEntity[size];
        }
    };
}

class ProductsRecyclerAdapter extends RecyclerView.Adapter<ProductsRecyclerAdapter.MyViewHolder> implements Filterable {

        List<ProductEntity> productList = Collections.emptyList();
        Context context;
        List<ProductEntity> filteredProductList = Collections.emptyList();

        public ProductsRecyclerAdapter(List<ProductEntity> productList, Context context) {
            this.productList = productList;
            this.context = context;
            filteredProductList = productList;
        }

        public class MyViewHolder extends RecyclerView.ViewHolder {

            TextView product_name;
            ImageView product_image;
            CardView product_catalog_card;
            AVLoadingIndicatorView progress_ball_image ;

            public MyViewHolder(View view) {
                super(view);
                product_name = view.findViewById(R.id.product_name);
                product_image = view.findViewById(R.id.product_image);
                product_catalog_card = view.findViewById(R.id.product_catalog_card);
                progress_ball_image = view.findViewById(R.id.progress_ball_image) ;
            }
        }

        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.product_entity_design, parent, false);
            return new MyViewHolder(itemView);
        }

        @Override
        public void onBindViewHolder(final MyViewHolder holder, final int position) {
            holder.product_name.setText(productList.get(position).about);
            holder.progress_ball_image.setVisibility(View.VISIBLE) ;
            Picasso.with(context)
                    .load(productList.get(position).image.get(0).url)
                    .centerInside()
                    .resize(200, 200)
                    .memoryPolicy(MemoryPolicy.NO_STORE)
                    .into(holder.product_image, new Callback() {
                        @Override
                        public void onSuccess() {
                            holder.progress_ball_image.smoothToHide(); ;
                        }

                        @Override
                        public void onError() {

                        }
                    });
            holder.product_catalog_card.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(v.getContext(), ProductDetail.class);
                    intent.putExtra("product", productList.get(position));
                    v.getContext().startActivity(intent);
                }
            });
        }

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

        @Override
        public Filter getFilter() {
            return new Filter() {
                @Override
                protected FilterResults performFiltering(CharSequence charSequence) {
                    String charString = charSequence.toString();
                    if (charString.isEmpty()) {
                        filteredProductList = productList;
                    } else {
                        ArrayList<ProductEntity> filteredList = new ArrayList<>();
                        for (ProductEntity productEntity : productList) {
                            if (productEntity.about.toLowerCase().contains(charString)) {
                                filteredList.add(productEntity);
                            }
                        }
                        filteredProductList = filteredList;
                    }

                    FilterResults filterResults = new FilterResults();
                    filterResults.values = filteredProductList;
                    return filterResults;
                }

                @Override
                protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                    filteredProductList = (ArrayList<ProductEntity>) filterResults.values;
                    notifyDataSetChanged();
                }
            };
        }
    }