Multiple Filters and Sorting with Firebase Database in Android

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Hello Friends, we have already seen how to make multiple filters and sorting in android before but today we are going to see multiple filters and sorting with Firebase Database in Android. I am sharing this because one of our visitor asked for. Firebase currently offers two types of database solution Realtime Database and Cloud Firestore. We are going to use Cloud Firestore here instead of Realtime Database because it is newest database and faster than Realtime Database. We are going to use same logic and method to filter and sort the items as Cloud Firestore supports limited compound queries. And if you are new to firebase then you can also check Firebase Cloud Firestore Database Example in Android.

So, here is the code

build.gradle (Project Level)

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    
    repositories {
        google()
        jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.1'
        classpath 'com.google.gms:google-services:4.3.3'//added

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

repositories {

google()

jcenter()

}

dependencies {

classpath 'com.android.tools.build:gradle:3.6.1'

classpath 'com.google.gms:google-services:4.3.3'//added

// NOTE: Do not place your application dependencies here; they belong

// in the individual module build.gradle files

}

allprojects {

repositories {

google()

jcenter()

}

task clean(type: Delete) {

delete rootProject.buildDir

}

build.gradle (Module Level)

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'//added

android {
    compileSdkVersion 28


    defaultConfig {
        applicationId "com.zatackcoder.filtersortfirebasedatabaseexample"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        //to fix Cannot fit requested classes in a single dex file error
        multiDexEnabled true //added
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'com.google.firebase:firebase-auth:19.2.0' //added
    implementation 'com.google.firebase:firebase-firestore:21.4.1' //added
    implementation 'androidx.recyclerview:recyclerview:1.1.0' //added
    //Cannot fit requested classes in a single dex file
    implementation 'com.android.support:multidex:1.0.3' //added
}

apply plugin: 'com.android.application'

apply plugin: 'com.google.gms.google-services'//added

android {

compileSdkVersion 28

defaultConfig {

applicationId "com.zatackcoder.filtersortfirebasedatabaseexample"

minSdkVersion 16

targetSdkVersion 28

versionCode 1

versionName "1.0"

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

//to fix Cannot fit requested classes in a single dex file error

multiDexEnabled true //added

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'

}

dependencies {

implementation fileTree(dir: 'libs', include: ['*.jar'])

implementation 'androidx.appcompat:appcompat:1.1.0'

implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

testImplementation 'junit:junit:4.12'

androidTestImplementation 'androidx.test.ext:junit:1.1.1'

androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

implementation 'com.google.firebase:firebase-auth:19.2.0' //added

implementation 'com.google.firebase:firebase-firestore:21.4.1' //added

implementation 'androidx.recyclerview:recyclerview:1.1.0' //added

//Cannot fit requested classes in a single dex file

implementation 'com.android.support:multidex:1.0.3' //added

}

MainActivity.java

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

        Button addItemB = findViewById(R.id.addItemB);
        Button viewItemsB = findViewById(R.id.viewItemsB);

        addItemB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, AddItemActivity.class));
            }
        });

        viewItemsB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, ViewItemsActivity.class));
            }
        });
    }
}

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button addItemB = findViewById(R.id.addItemB);

Button viewItemsB = findViewById(R.id.viewItemsB);

addItemB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

startActivity(new Intent(MainActivity.this, AddItemActivity.class));

}

});

viewItemsB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

startActivity(new Intent(MainActivity.this, ViewItemsActivity.class));

}

});

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <Button
            android:id="@+id/addItemB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add Item" />

        <Button
            android:id="@+id/viewItemsB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="View Items" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<Button

android:id="@+id/addItemB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Add Item" />

<Button

android:id="@+id/viewItemsB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="View Items" />

</LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

Item.java

package com.zatackcoder.filtersortfirebasedatabaseexample.classes;

import java.util.Comparator;

public class Item {
    private String name;
    private String color;
    private Integer size;
    private Double price;

    public static final Comparator<Item> nameComparator = new Comparator<Item>() {
        @Override
        public int compare(Item o1, Item o2) {
            return o1.getName().compareTo(o2.getName());
        }
    };
    public static final Comparator<Item> sizeComparator = new Comparator<Item>() {
        @Override
        public int compare(Item o1, Item o2) {
            return o1.getSize() - o2.getSize();
        }
    };
    public static final Comparator<Item> priceComparator = new Comparator<Item>() {
        @Override
        public int compare(Item o1, Item o2) {
            return (int) (o1.getPrice() - o2.getPrice());
        }
    };

    /**
    * required to deserialize from firebase database
    */
    public Item() {}

    public Item(String name, String color, Integer size, Double price) {
        this.name = name;
        this.color = color;
        this.size = size;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public Integer getSize() {
        return size;
    }

    //customised setter to overcome deserialize object error
    //java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to int
    public void setSize(Object size) {
        try {
            this.size = Integer.parseInt(size.toString());
        } catch (Exception e) {
            this.size = 0;
        }
    }

    public Double getPrice() {
        return price;
    }

    //customised setter to overcome deserialize object error
    //java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to double
    public void setPrice(Object price) {
        try {
            this.price = Double.parseDouble(price.toString());
        } catch (Exception e) {
            this.price = 0.00;
        }
    }
}

package com.zatackcoder.filtersortfirebasedatabaseexample.classes;

import java.util.Comparator;

public class Item {

private String name;

private String color;

private Integer size;

private Double price;

public static final Comparator<Item> nameComparator = new Comparator<Item>() {

@Override

public int compare(Item o1, Item o2) {

return o1.getName().compareTo(o2.getName());

}

};

public static final Comparator<Item> sizeComparator = new Comparator<Item>() {

@Override

public int compare(Item o1, Item o2) {

return o1.getSize() - o2.getSize();

}

};

public static final Comparator<Item> priceComparator = new Comparator<Item>() {

@Override

public int compare(Item o1, Item o2) {

return (int) (o1.getPrice() - o2.getPrice());

}

};

/**

* required to deserialize from firebase database

public Item() {}

public Item(String name, String color, Integer size, Double price) {

this.name = name;

this.color = color;

this.size = size;

this.price = price;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getColor() {

return color;

}

public void setColor(String color) {

this.color = color;

}

public Integer getSize() {

return size;

}

//customised setter to overcome deserialize object error

//java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to int

public void setSize(Object size) {

try {

this.size = Integer.parseInt(size.toString());

} catch (Exception e) {

this.size = 0;

}

public Double getPrice() {

return price;

}

//customised setter to overcome deserialize object error

//java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to double

public void setPrice(Object price) {

try {

this.price = Double.parseDouble(price.toString());

} catch (Exception e) {

this.price = 0.00;

}

AddItemActivity.java

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Item;

public class AddItemActivity extends AppCompatActivity {

    private FirebaseFirestore db;
    private EditText nameET;
    private EditText colorET;
    private EditText sizeET;
    private EditText priceET;

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

        // Access a Cloud Firestore instance from your Activity
        db = FirebaseFirestore.getInstance();
        initControls();
    }

    private void initControls() {
        nameET = findViewById(R.id.nameET);
        colorET = findViewById(R.id.colorET);
        sizeET = findViewById(R.id.sizeET);
        priceET = findViewById(R.id.priceET);

        Button saveB = findViewById(R.id.saveB);
        saveB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                // Add a new document with a generated ID
                db.collection("items")
                        .add(new Item(nameET.getText().toString(), colorET.getText().toString(), Integer.parseInt(sizeET.getText().toString()), Double.parseDouble(priceET.getText().toString())))
                        .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                            @Override
                            public void onSuccess(DocumentReference documentReference) {
                                nameET.setText("");
                                colorET.setText("");
                                sizeET.setText("");
                                priceET.setText("");
                                Toast.makeText(getApplicationContext(), "Item Added with ID: " + documentReference.getId(), Toast.LENGTH_LONG).show();
                            }
                        })
                        .addOnFailureListener(new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                Toast.makeText(getApplicationContext(), "Error Adding Item! - " + e, Toast.LENGTH_LONG).show();
                            }
                        });
            }
        });
    }
}

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;

import com.google.android.gms.tasks.OnSuccessListener;

import com.google.firebase.firestore.DocumentReference;

import com.google.firebase.firestore.FirebaseFirestore;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Item;

public class AddItemActivity extends AppCompatActivity {

private FirebaseFirestore db;

private EditText nameET;

private EditText colorET;

private EditText sizeET;

private EditText priceET;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_add_item);

// Access a Cloud Firestore instance from your Activity

db = FirebaseFirestore.getInstance();

initControls();

}

private void initControls() {

nameET = findViewById(R.id.nameET);

colorET = findViewById(R.id.colorET);

sizeET = findViewById(R.id.sizeET);

priceET = findViewById(R.id.priceET);

Button saveB = findViewById(R.id.saveB);

saveB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// Add a new document with a generated ID

db.collection("items")

.add(new Item(nameET.getText().toString(), colorET.getText().toString(), Integer.parseInt(sizeET.getText().toString()), Double.parseDouble(priceET.getText().toString())))

.addOnSuccessListener(new OnSuccessListener<DocumentReference>() {

@Override

public void onSuccess(DocumentReference documentReference) {

nameET.setText("");

colorET.setText("");

sizeET.setText("");

priceET.setText("");

Toast.makeText(getApplicationContext(), "Item Added with ID: " + documentReference.getId(), Toast.LENGTH_LONG).show();

}

})

.addOnFailureListener(new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception e) {

Toast.makeText(getApplicationContext(), "Error Adding Item! - " + e, Toast.LENGTH_LONG).show();

}

});

}

});

}

activity_add_item.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".AddItemActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add Item"
            android:textSize="18sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/nameET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:ems="10"
            android:hint="Name" />

        <EditText
            android:id="@+id/colorET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Color" />

        <EditText
            android:id="@+id/sizeET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Size" />

        <EditText
            android:id="@+id/priceET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Price" />

        <Button
            android:id="@+id/saveB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:text="Save" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".AddItemActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Add Item"

android:textSize="18sp"

android:textStyle="bold" />

<EditText

android:id="@+id/nameET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="50dp"

android:ems="10"

android:hint="Name" />

<EditText

android:id="@+id/colorET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Color" />

<EditText

android:id="@+id/sizeET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Size" />

<EditText

android:id="@+id/priceET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Price" />

<Button

android:id="@+id/saveB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="50dp"

android:text="Save" />

</LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

ItemAdapter.java

package com.zatackcoder.filtersortfirebasedatabaseexample.adaptors;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.R;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Item;

import java.util.List;

public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {

    private final Context context;
    private final List<Item> items;

    public ItemAdapter(Context context, List<Item> items) {
        this.context = context;
        this.items = items;
    }

    @NonNull
    @Override
    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, viewGroup, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final ItemViewHolder itemViewHolder, final int position) {
        itemViewHolder.container.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String message = "You clicked on " + items.get(position).getName() + " - color:" + items.get(position).getColor() + " | size:" + items.get(position).getSize() + " | price:" + items.get(position).getPrice();
                Toast.makeText(context, message, Toast.LENGTH_LONG).show();
            }
        });
        itemViewHolder.name.setText(items.get(position).getName());
        itemViewHolder.color.setText("Color: " + items.get(position).getColor());
        itemViewHolder.size.setText("Size: " + items.get(position).getSize());
        itemViewHolder.price.setText("Price: " + items.get(position).getPrice());
    }

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

    public static class ItemViewHolder extends RecyclerView.ViewHolder {
        final View container;
        final TextView name;
        final TextView color;
        final TextView size;
        final TextView price;

        ItemViewHolder(View view) {
            super(view);
            container = view;
            name = view.findViewById(R.id.name);
            color = view.findViewById(R.id.color);
            size = view.findViewById(R.id.size);
            price = view.findViewById(R.id.price);
        }
    }

}

package com.zatackcoder.filtersortfirebasedatabaseexample.adaptors;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import android.widget.Toast;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.R;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Item;

import java.util.List;

public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {

private final Context context;

private final List<Item> items;

public ItemAdapter(Context context, List<Item> items) {

this.context = context;

this.items = items;

}

@NonNull

@Override

public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {

View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, viewGroup, false);

return new ItemViewHolder(view);

}

@Override

public void onBindViewHolder(@NonNull final ItemViewHolder itemViewHolder, final int position) {

itemViewHolder.container.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String message = "You clicked on " + items.get(position).getName() + " - color:" + items.get(position).getColor() + " | size:" + items.get(position).getSize() + " | price:" + items.get(position).getPrice();

Toast.makeText(context, message, Toast.LENGTH_LONG).show();

}

});

itemViewHolder.name.setText(items.get(position).getName());

itemViewHolder.color.setText("Color: " + items.get(position).getColor());

itemViewHolder.size.setText("Size: " + items.get(position).getSize());

itemViewHolder.price.setText("Price: " + items.get(position).getPrice());

}

@Override

public int getItemCount() {

return items.size();

}

public static class ItemViewHolder extends RecyclerView.ViewHolder {

final View container;

final TextView name;

final TextView color;

final TextView size;

final TextView price;

ItemViewHolder(View view) {

super(view);

container = view;

name = view.findViewById(R.id.name);

color = view.findViewById(R.id.color);

size = view.findViewById(R.id.size);

price = view.findViewById(R.id.price);

}

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:background="#ffffff"
    android:clickable="true"
    android:orientation="vertical"
    android:focusable="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?android:attr/selectableItemBackground"
        android:orientation="vertical"
        android:padding="5dp">

        <TextView
            android:id="@+id/name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Name"
            android:textFontWeight="bold"
            android:textSize="15dp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/color"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Color: Red"
                android:textSize="12dp" />

            <View
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_margin="5dp"
                android:background="#ADABAB" />

            <TextView
                android:id="@+id/size"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Size: 10"
                android:textSize="12dp" />

            <View
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_margin="5dp"
                android:background="#ADABAB" />

            <TextView
                android:id="@+id/price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Price: 100"
                android:textSize="12dp" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="5dp"

android:background="#ffffff"

android:clickable="true"

android:orientation="vertical"

android:focusable="true">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="?android:attr/selectableItemBackground"

android:orientation="vertical"

android:padding="5dp">

<TextView

android:id="@+id/name"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Name"

android:textFontWeight="bold"

android:textSize="15dp" />

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<TextView

android:id="@+id/color"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Color: Red"

android:textSize="12dp" />

<View

android:layout_width="1dp"

android:layout_height="match_parent"

android:layout_margin="5dp"

android:background="#ADABAB" />

<TextView

android:id="@+id/size"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Size: 10"

android:textSize="12dp" />

<View

android:layout_width="1dp"

android:layout_height="match_parent"

android:layout_margin="5dp"

android:background="#ADABAB" />

<TextView

android:id="@+id/price"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Price: 100"

android:textSize="12dp" />

</LinearLayout>

ViewItemsActivity.java

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;
import com.google.firebase.firestore.QuerySnapshot;
import com.zatackcoder.filtersortfirebasedatabaseexample.adaptors.ItemAdapter;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Item;

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

public class ViewItemsActivity extends AppCompatActivity {

    private Query query;

    private List<Item> items = new ArrayList<>();
    private RecyclerView mRecyclerView;
    private ItemAdapter mAdapter;
    private ProgressBar loadPB;

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

        FirebaseFirestore db = FirebaseFirestore.getInstance();
        query = db.collection("items");
        initControls();
    }

    private void initControls() {
        mRecyclerView = findViewById(R.id.recycler_view);
        mRecyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new ItemAdapter(getApplicationContext(), items);
        mRecyclerView.setAdapter(mAdapter);

        RadioButton rb = findViewById(R.id.sortByName);
        switch (Preferences.ORDER_BY) {
            case "name" :
                rb = findViewById(R.id.sortByName);
                break;
            case "size" :
                rb = findViewById(R.id.sortBySize);
                break;
            case "price" :
                rb = findViewById(R.id.sortByPrice);
                break;
        }
        rb.setChecked(true);

        loadPB = findViewById(R.id.loadPB);
        loadPB.setVisibility(View.VISIBLE);
        query.orderBy(Preferences.ORDER_BY).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                items = task.getResult().toObjects(Item.class);

                if(!Preferences.filters.isEmpty()) {
                    ArrayList<Item> filteredItems = new ArrayList<>();
                    List<String> colors = Preferences.filters.get(Filter.INDEX_COLOR).getSelected();
                    List<String> sizes = Preferences.filters.get(Filter.INDEX_SIZE).getSelected();
                    List<String> prices = Preferences.filters.get(Filter.INDEX_PRICE).getSelected();
                    for (Item item : items) {
                        boolean colorMatched = true;
                        if (colors.size() > 0 && !colors.contains(item.getColor())) {
                            colorMatched = false;
                        }
                        boolean sizeMatched = true;
                        if (sizes.size() > 0 && !sizes.contains(item.getSize().toString())) {
                            sizeMatched = false;
                        }
                        boolean priceMatched = true;
                        if (prices.size() > 0 && !priceContains(prices, item.getPrice())) {
                            priceMatched = false;
                        }
                        if (colorMatched && sizeMatched && priceMatched) {
                            filteredItems.add(item);
                        }
                    }
                    items = filteredItems;
                }

                mAdapter = new ItemAdapter(getApplicationContext(), items);
                mRecyclerView.setAdapter(mAdapter);
                loadPB.setVisibility(View.GONE);
            }
        });

        final LinearLayout sortContainerBackLL = findViewById(R.id.sortContainerBackLL);
        final LinearLayout sortContainerLL = findViewById(R.id.sortContainerLL);
        //sortContainerLL.setTranslationY(-sortContainerLL.getHeight());
        sortContainerBackLL.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sortContainerLL.animate()
                        .translationY(-sortContainerLL.getHeight())
                        .setListener(new AnimatorListenerAdapter() {
                            @Override
                            public void onAnimationEnd(Animator animation) {
                                sortContainerLL.animate().setListener(null);
                                sortContainerBackLL.setVisibility(View.GONE);
                            }
                        });
            }
        });
        Button sortB = findViewById(R.id.sortB);
        sortB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sortContainerBackLL.setVisibility(View.VISIBLE);
                sortContainerLL.animate().translationY(0);
            }
        });
        Button filterB = findViewById(R.id.filterB);
        filterB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ViewItemsActivity.this, FilterActivity.class));
            }
        });

        RadioGroup sortRG = findViewById(R.id.sortRG);
        sortRG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                Item[] itemsArr = new Item[items.size()];
                itemsArr = items.toArray(itemsArr);
                switch (checkedId) {
                    case R.id.sortByName:
                        Arrays.sort(itemsArr, Item.nameComparator);
                        Preferences.ORDER_BY = "name";
                        break;
                    case R.id.sortBySize:
                        Arrays.sort(itemsArr, Item.sizeComparator);
                        Preferences.ORDER_BY = "size";
                        break;
                    case R.id.sortByPrice:
                        Arrays.sort(itemsArr, Item.priceComparator);
                        Preferences.ORDER_BY = "price";
                        break;

                }
                items = Arrays.asList(itemsArr);
                mAdapter = new ItemAdapter(getApplicationContext(), items);
                mRecyclerView.setAdapter(mAdapter);

                sortContainerLL.animate()
                        .translationY(-sortContainerLL.getHeight())
                        .setListener(new AnimatorListenerAdapter() {
                            @Override
                            public void onAnimationEnd(Animator animation) {
                                sortContainerLL.animate().setListener(null);
                                sortContainerBackLL.setVisibility(View.GONE);
                            }
                        });
            }
        });
    }

    private boolean priceContains(List<String> prices, Double price) {
        boolean flag = false;
        for (String p : prices) {
            String[] tmpPrices = p.split("-");
            if (price >= Double.parseDouble(tmpPrices[0]) && price <= Double.parseDouble(tmpPrices[1])) {
                flag = true;
                break;
            }
        }
        return flag;
    }
}

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package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.animation.Animator;

import android.animation.AnimatorListenerAdapter;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.LinearLayout;

import android.widget.ProgressBar;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnCompleteListener;

import com.google.android.gms.tasks.Task;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.firestore.Query;

import com.google.firebase.firestore.QuerySnapshot;

import com.zatackcoder.filtersortfirebasedatabaseexample.adaptors.ItemAdapter;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Item;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class ViewItemsActivity extends AppCompatActivity {

private Query query;

private List<Item> items = new ArrayList<>();

private RecyclerView mRecyclerView;

private ItemAdapter mAdapter;

private ProgressBar loadPB;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_view_items);

FirebaseFirestore db = FirebaseFirestore.getInstance();

query = db.collection("items");

initControls();

}

private void initControls() {

mRecyclerView = findViewById(R.id.recycler_view);

mRecyclerView.setHasFixedSize(true);

RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);

mRecyclerView.setLayoutManager(mLayoutManager);

mAdapter = new ItemAdapter(getApplicationContext(), items);

mRecyclerView.setAdapter(mAdapter);

RadioButton rb = findViewById(R.id.sortByName);

switch (Preferences.ORDER_BY) {

case "name" :

rb = findViewById(R.id.sortByName);

break;

case "size" :

rb = findViewById(R.id.sortBySize);

break;

case "price" :

rb = findViewById(R.id.sortByPrice);

break;

}

rb.setChecked(true);

loadPB = findViewById(R.id.loadPB);

loadPB.setVisibility(View.VISIBLE);

query.orderBy(Preferences.ORDER_BY).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {

@Override

public void onComplete(@NonNull Task<QuerySnapshot> task) {

items = task.getResult().toObjects(Item.class);

if(!Preferences.filters.isEmpty()) {

ArrayList<Item> filteredItems = new ArrayList<>();

List<String> colors = Preferences.filters.get(Filter.INDEX_COLOR).getSelected();

List<String> sizes = Preferences.filters.get(Filter.INDEX_SIZE).getSelected();

List<String> prices = Preferences.filters.get(Filter.INDEX_PRICE).getSelected();

for (Item item : items) {

boolean colorMatched = true;

if (colors.size() > 0 && !colors.contains(item.getColor())) {

colorMatched = false;

}

boolean sizeMatched = true;

if (sizes.size() > 0 && !sizes.contains(item.getSize().toString())) {

sizeMatched = false;

}

boolean priceMatched = true;

if (prices.size() > 0 && !priceContains(prices, item.getPrice())) {

priceMatched = false;

}

if (colorMatched && sizeMatched && priceMatched) {

filteredItems.add(item);

}

items = filteredItems;

}

mAdapter = new ItemAdapter(getApplicationContext(), items);

mRecyclerView.setAdapter(mAdapter);

loadPB.setVisibility(View.GONE);

}

});

final LinearLayout sortContainerBackLL = findViewById(R.id.sortContainerBackLL);

final LinearLayout sortContainerLL = findViewById(R.id.sortContainerLL);

//sortContainerLL.setTranslationY(-sortContainerLL.getHeight());

sortContainerBackLL.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

sortContainerLL.animate()

.translationY(-sortContainerLL.getHeight())

.setListener(new AnimatorListenerAdapter() {

@Override

public void onAnimationEnd(Animator animation) {

sortContainerLL.animate().setListener(null);

sortContainerBackLL.setVisibility(View.GONE);

}

});

}

});

Button sortB = findViewById(R.id.sortB);

sortB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

sortContainerBackLL.setVisibility(View.VISIBLE);

sortContainerLL.animate().translationY(0);

}

});

Button filterB = findViewById(R.id.filterB);

filterB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

startActivity(new Intent(ViewItemsActivity.this, FilterActivity.class));

}

});

RadioGroup sortRG = findViewById(R.id.sortRG);

sortRG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

Item[] itemsArr = new Item[items.size()];

itemsArr = items.toArray(itemsArr);

switch (checkedId) {

case R.id.sortByName:

Arrays.sort(itemsArr, Item.nameComparator);

Preferences.ORDER_BY = "name";

break;

case R.id.sortBySize:

Arrays.sort(itemsArr, Item.sizeComparator);

Preferences.ORDER_BY = "size";

break;

case R.id.sortByPrice:

Arrays.sort(itemsArr, Item.priceComparator);

Preferences.ORDER_BY = "price";

break;

}

items = Arrays.asList(itemsArr);

mAdapter = new ItemAdapter(getApplicationContext(), items);

mRecyclerView.setAdapter(mAdapter);

sortContainerLL.animate()

.translationY(-sortContainerLL.getHeight())

.setListener(new AnimatorListenerAdapter() {

@Override

public void onAnimationEnd(Animator animation) {

sortContainerLL.animate().setListener(null);

sortContainerBackLL.setVisibility(View.GONE);

}

});

}

});

}

private boolean priceContains(List<String> prices, Double price) {

boolean flag = false;

for (String p : prices) {

String[] tmpPrices = p.split("-");

if (price >= Double.parseDouble(tmpPrices[0]) && price <= Double.parseDouble(tmpPrices[1])) {

flag = true;

break;

}

return flag;

}

activity_view_items.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ViewItemsActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:orientation="horizontal">

            <Button
                android:id="@+id/sortB"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:drawableLeft="@drawable/ic_sort_black_24dp"
                android:text="Sort" />

            <Button
                android:id="@+id/filterB"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:drawableLeft="@drawable/ic_filter_list_black_24dp"
                android:text="Filter" />

        </LinearLayout>

    </LinearLayout>

    <LinearLayout
        android:id="@+id/sortContainerBackLL"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#C4000000"
        android:orientation="vertical"
        android:visibility="gone"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="0dp">

        <LinearLayout
            android:id="@+id/sortContainerLL"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#FFFFFFFF"
            android:orientation="vertical"
            tools:ignore="MissingConstraints"
            tools:layout_editor_absoluteX="0dp"
            tools:layout_editor_absoluteY="0dp">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="SORT BY"
                android:textSize="15dp" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#929191" />

            <RadioGroup
                android:id="@+id/sortRG"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="10dp">

                <RadioButton
                    android:id="@+id/sortByName"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layoutDirection="rtl"
                    android:text="Name"
                    android:checked="true"/>

                <RadioButton
                    android:id="@+id/sortBySize"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layoutDirection="rtl"
                    android:text="Size" />

                <RadioButton
                    android:id="@+id/sortByPrice"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layoutDirection="rtl"
                    android:text="Price" />
            </RadioGroup>

        </LinearLayout>

    </LinearLayout>

    <ProgressBar
        android:id="@+id/loadPB"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        android:progress="-1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

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<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".ViewItemsActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/recycler_view"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1" />

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="0"

android:orientation="horizontal">

<Button

android:id="@+id/sortB"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:drawableLeft="@drawable/ic_sort_black_24dp"

android:text="Sort" />

<Button

android:id="@+id/filterB"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:drawableLeft="@drawable/ic_filter_list_black_24dp"

android:text="Filter" />

</LinearLayout>

<LinearLayout

android:id="@+id/sortContainerBackLL"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#C4000000"

android:orientation="vertical"

android:visibility="gone"

tools:ignore="MissingConstraints"

tools:layout_editor_absoluteX="0dp"

tools:layout_editor_absoluteY="0dp">

<LinearLayout

android:id="@+id/sortContainerLL"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="#FFFFFFFF"

android:orientation="vertical"

tools:ignore="MissingConstraints"

tools:layout_editor_absoluteX="0dp"

tools:layout_editor_absoluteY="0dp">

<TextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:padding="10dp"

android:text="SORT BY"

android:textSize="15dp" />

<View

android:layout_width="match_parent"

android:layout_height="1dp"

android:background="#929191" />

<RadioGroup

android:id="@+id/sortRG"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:padding="10dp">

<RadioButton

android:id="@+id/sortByName"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layoutDirection="rtl"

android:text="Name"

android:checked="true"/>

<RadioButton

android:id="@+id/sortBySize"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layoutDirection="rtl"

android:text="Size" />

<RadioButton

android:id="@+id/sortByPrice"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layoutDirection="rtl"

android:text="Price" />

</RadioGroup>

</LinearLayout>

<ProgressBar

android:id="@+id/loadPB"

style="?android:attr/progressBarStyle"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:visibility="gone"

android:progress="-1"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Filter.java

package com.zatackcoder.filtersortfirebasedatabaseexample.classes;

import java.util.List;

public class Filter {
    public static final Integer INDEX_COLOR = 0;
    public static final Integer INDEX_SIZE = 1;
    public static final Integer INDEX_PRICE = 2;

    private String name;
    private List<String> values;
    private List<String> selected;

    public Filter(String name, List<String> values, List<String> selected) {
        this.name = name;
        this.values = values;
        this.selected = selected;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<String> getValues() {
        return values;
    }

    public void setValues(List<String> values) {
        this.values = values;
    }

    public List<String> getSelected() {
        return selected;
    }

    public void setSelected(List<String> selected) {
        this.selected = selected;
    }
}

package com.zatackcoder.filtersortfirebasedatabaseexample.classes;

import java.util.List;

public class Filter {

public static final Integer INDEX_COLOR = 0;

public static final Integer INDEX_SIZE = 1;

public static final Integer INDEX_PRICE = 2;

private String name;

private List<String> values;

private List<String> selected;

public Filter(String name, List<String> values, List<String> selected) {

this.name = name;

this.values = values;

this.selected = selected;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public List<String> getValues() {

return values;

}

public void setValues(List<String> values) {

this.values = values;

}

public List<String> getSelected() {

return selected;

}

public void setSelected(List<String> selected) {

this.selected = selected;

}

FilterActivity.java

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.adaptors.FilterAdapter;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

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

public class FilterActivity extends AppCompatActivity {

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

        initControls();
    }

    private void initControls() {
        RecyclerView filterRV = findViewById(R.id.filterRV);
        RecyclerView filterValuesRV = findViewById(R.id.filterValuesRV);
        filterRV.setLayoutManager(new LinearLayoutManager(this));
        filterValuesRV.setLayoutManager(new LinearLayoutManager(this));

        List<String> colors = Arrays.asList("Red", "Green", "Blue", "White", "Yellow");
        if (!Preferences.filters.containsKey(Filter.INDEX_COLOR)) {
            Preferences.filters.put(Filter.INDEX_COLOR, new Filter("Color", colors, new ArrayList()));
        }
        List<String> sizes = Arrays.asList("10", "12", "14", "16", "18", "20", "30", "40");
        if (!Preferences.filters.containsKey(Filter.INDEX_SIZE)) {
            Preferences.filters.put(Filter.INDEX_SIZE, new Filter("Size", sizes, new ArrayList()));
        }
        List<String> prices = Arrays.asList("0-100", "101-200", "201-300");
        if (!Preferences.filters.containsKey(Filter.INDEX_PRICE)) {
            Preferences.filters.put(Filter.INDEX_PRICE, new Filter("Price", prices, new ArrayList()));
        }

        FilterAdapter filterAdapter = new FilterAdapter(Preferences.filters, filterValuesRV);
        filterRV.setAdapter(filterAdapter);

        Button clearB = findViewById(R.id.clearB);
        clearB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Preferences.filters.get(Filter.INDEX_COLOR).setSelected(new ArrayList());
                Preferences.filters.get(Filter.INDEX_SIZE).setSelected(new ArrayList());
                Preferences.filters.get(Filter.INDEX_PRICE).setSelected(new ArrayList());
                startActivity(new Intent(FilterActivity.this, ViewItemsActivity.class));
                finish();
            }
        });

        Button applyB = findViewById(R.id.applyB);
        applyB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(FilterActivity.this, ViewItemsActivity.class));
                finish();
            }
        });
    }
}

package com.zatackcoder.filtersortfirebasedatabaseexample;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.adaptors.FilterAdapter;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class FilterActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_filter);

initControls();

}

private void initControls() {

RecyclerView filterRV = findViewById(R.id.filterRV);

RecyclerView filterValuesRV = findViewById(R.id.filterValuesRV);

filterRV.setLayoutManager(new LinearLayoutManager(this));

filterValuesRV.setLayoutManager(new LinearLayoutManager(this));

List<String> colors = Arrays.asList("Red", "Green", "Blue", "White", "Yellow");

if (!Preferences.filters.containsKey(Filter.INDEX_COLOR)) {

Preferences.filters.put(Filter.INDEX_COLOR, new Filter("Color", colors, new ArrayList()));

}

List<String> sizes = Arrays.asList("10", "12", "14", "16", "18", "20", "30", "40");

if (!Preferences.filters.containsKey(Filter.INDEX_SIZE)) {

Preferences.filters.put(Filter.INDEX_SIZE, new Filter("Size", sizes, new ArrayList()));

}

List<String> prices = Arrays.asList("0-100", "101-200", "201-300");

if (!Preferences.filters.containsKey(Filter.INDEX_PRICE)) {

Preferences.filters.put(Filter.INDEX_PRICE, new Filter("Price", prices, new ArrayList()));

}

FilterAdapter filterAdapter = new FilterAdapter(Preferences.filters, filterValuesRV);

filterRV.setAdapter(filterAdapter);

Button clearB = findViewById(R.id.clearB);

clearB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Preferences.filters.get(Filter.INDEX_COLOR).setSelected(new ArrayList());

Preferences.filters.get(Filter.INDEX_SIZE).setSelected(new ArrayList());

Preferences.filters.get(Filter.INDEX_PRICE).setSelected(new ArrayList());

startActivity(new Intent(FilterActivity.this, ViewItemsActivity.class));

finish();

}

});

Button applyB = findViewById(R.id.applyB);

applyB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

startActivity(new Intent(FilterActivity.this, ViewItemsActivity.class));

finish();

}

});

}

activity_filter.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".FilterActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/filterRV"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="0"
                android:background="#F2F2F2" />

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/filterValuesRV"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="#ffffff" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:orientation="horizontal">

            <Button
                android:id="@+id/clearB"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Clear" />

            <Button
                android:id="@+id/applyB"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Apply" />

        </LinearLayout>

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".FilterActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_weight="1"

android:orientation="horizontal">

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/filterRV"

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:layout_weight="0"

android:background="#F2F2F2" />

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/filterValuesRV"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_weight="1"

android:background="#ffffff" />

</LinearLayout>

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="0"

android:orientation="horizontal">

<Button

android:id="@+id/clearB"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="Clear" />

<Button

android:id="@+id/applyB"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="Apply" />

</LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

FilterAdapter.java

package com.zatackcoder.filtersortfirebasedatabaseexample.adaptors;

import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.R;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.HashMap;

public class FilterAdapter extends RecyclerView.Adapter<FilterAdapter.MyViewHolder> {

    private final HashMap<Integer, Filter> filters;
    private final RecyclerView filterValuesRV;
    private int selectedPosition = 0;

    public FilterAdapter(HashMap<Integer, Filter> filters, RecyclerView filterValuesRV) {
        this.filters = filters;
        this.filterValuesRV = filterValuesRV;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.filter_item, viewGroup, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int position) {
        myViewHolder.container.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                filterValuesRV.setAdapter(new FilterValuesAdapter(position));
                selectedPosition = position;
                notifyDataSetChanged();
            }
        });

        filterValuesRV.setAdapter(new FilterValuesAdapter(selectedPosition));
        myViewHolder.container.setBackgroundColor(selectedPosition == position ? Color.WHITE : Color.TRANSPARENT);
        myViewHolder.title.setText(filters.get(position).getName());
    }

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

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        final View container;
        final TextView title;

        MyViewHolder(View view) {
            super(view);
            container = view;
            title = view.findViewById(R.id.title);
        }
    }

}

package com.zatackcoder.filtersortfirebasedatabaseexample.adaptors;

import android.graphics.Color;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.R;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.HashMap;

public class FilterAdapter extends RecyclerView.Adapter<FilterAdapter.MyViewHolder> {

private final HashMap<Integer, Filter> filters;

private final RecyclerView filterValuesRV;

private int selectedPosition = 0;

public FilterAdapter(HashMap<Integer, Filter> filters, RecyclerView filterValuesRV) {

this.filters = filters;

this.filterValuesRV = filterValuesRV;

}

@NonNull

@Override

public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {

View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.filter_item, viewGroup, false);

return new MyViewHolder(view);

}

@Override

public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int position) {

myViewHolder.container.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

filterValuesRV.setAdapter(new FilterValuesAdapter(position));

selectedPosition = position;

notifyDataSetChanged();

}

});

filterValuesRV.setAdapter(new FilterValuesAdapter(selectedPosition));

myViewHolder.container.setBackgroundColor(selectedPosition == position ? Color.WHITE : Color.TRANSPARENT);

myViewHolder.title.setText(filters.get(position).getName());

}

@Override

public int getItemCount() {

return filters.size();

}

public static class MyViewHolder extends RecyclerView.ViewHolder {

final View container;

final TextView title;

MyViewHolder(View view) {

super(view);

container = view;

title = view.findViewById(R.id.title);

}

filter_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp"
    android:layout_marginTop="5dp"
    android:layout_marginRight="0dp"
    android:layout_marginBottom="5dp"
    android:background="?android:attr/selectableItemBackground"
    android:clickable="true"
    android:focusable="true"
    android:orientation="vertical">

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="Color"
        android:textFontWeight="bold"
        android:textSize="15dp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="5dp"

android:layout_marginTop="5dp"

android:layout_marginRight="0dp"

android:layout_marginBottom="5dp"

android:background="?android:attr/selectableItemBackground"

android:clickable="true"

android:focusable="true"

android:orientation="vertical">

<TextView

android:id="@+id/title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:padding="10dp"

android:text="Color"

android:textFontWeight="bold"

android:textSize="15dp" />

</LinearLayout>

FilterValuesAdapter.java

package com.zatackcoder.filtersortfirebasedatabaseexample.adaptors;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.R;
import com.zatackcoder.filtersortfirebasedatabaseexample.Preferences;
import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.List;

public class FilterValuesAdapter extends RecyclerView.Adapter<FilterValuesAdapter.MyViewHolder> {

    private final Integer filterIndex;

    public FilterValuesAdapter(Integer filterIndex) {
        this.filterIndex = filterIndex;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.filter_value_item, viewGroup, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int position) {
        final Filter tmpFilter = Preferences.filters.get(filterIndex);
        myViewHolder.value.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                List<String> selected = tmpFilter.getSelected();
                if(myViewHolder.value.isChecked()) {
                    selected.add(tmpFilter.getValues().get(position));
                    tmpFilter.setSelected(selected);
                } else {
                    selected.remove(tmpFilter.getValues().get(position));
                    tmpFilter.setSelected(selected);
                }
                Preferences.filters.put(filterIndex, tmpFilter);
            }
        });
        myViewHolder.value.setText(tmpFilter.getValues().get(position));
        if(tmpFilter.getSelected().contains(tmpFilter.getValues().get(position))) {
            myViewHolder.value.setChecked(true);
        }
    }

    @Override
    public int getItemCount() {
        return Preferences.filters.get(filterIndex).getValues().size();
    }

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        final CheckBox value;

        MyViewHolder(View view) {
            super(view);
            value = view.findViewById(R.id.value);
        }
    }

}

package com.zatackcoder.filtersortfirebasedatabaseexample.adaptors;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.CheckBox;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortfirebasedatabaseexample.R;

import com.zatackcoder.filtersortfirebasedatabaseexample.Preferences;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.List;

public class FilterValuesAdapter extends RecyclerView.Adapter<FilterValuesAdapter.MyViewHolder> {

private final Integer filterIndex;

public FilterValuesAdapter(Integer filterIndex) {

this.filterIndex = filterIndex;

}

@NonNull

@Override

public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {

View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.filter_value_item, viewGroup, false);

return new MyViewHolder(view);

}

@Override

public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int position) {

final Filter tmpFilter = Preferences.filters.get(filterIndex);

myViewHolder.value.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

List<String> selected = tmpFilter.getSelected();

if(myViewHolder.value.isChecked()) {

selected.add(tmpFilter.getValues().get(position));

tmpFilter.setSelected(selected);

} else {

selected.remove(tmpFilter.getValues().get(position));

tmpFilter.setSelected(selected);

}

Preferences.filters.put(filterIndex, tmpFilter);

}

});

myViewHolder.value.setText(tmpFilter.getValues().get(position));

if(tmpFilter.getSelected().contains(tmpFilter.getValues().get(position))) {

myViewHolder.value.setChecked(true);

}

@Override

public int getItemCount() {

return Preferences.filters.get(filterIndex).getValues().size();

}

public static class MyViewHolder extends RecyclerView.ViewHolder {

final CheckBox value;

MyViewHolder(View view) {

super(view);

value = view.findViewById(R.id.value);

}

filter_value_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:clickable="true"
    android:orientation="vertical"
    android:focusable="true">

    <CheckBox
        android:id="@+id/value"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Red"
        android:textFontWeight="bold"
        android:textSize="15dp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="5dp"

android:clickable="true"

android:orientation="vertical"

android:focusable="true">

<CheckBox

android:id="@+id/value"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Red"

android:textFontWeight="bold"

android:textSize="15dp" />

</LinearLayout>

Preferences.java

package com.zatackcoder.filtersortfirebasedatabaseexample;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.HashMap;

public abstract class Preferences {
    public  static final HashMap<Integer, Filter> filters = new HashMap<>();
    public static String ORDER_BY = "name";
}

package com.zatackcoder.filtersortfirebasedatabaseexample;

import com.zatackcoder.filtersortfirebasedatabaseexample.classes.Filter;

import java.util.HashMap;

public abstract class Preferences {

public static final HashMap<Integer, Filter> filters = new HashMap<>();

public static String ORDER_BY = "name";

}

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