Multiple Filters and Sorting in Android

Post Views: 8,770

Hello Friends, today we are going to see multiple filters and sorting in Android. In multiple filters we basically choose multiple values from multiple available filter options and then filter the list. We can see this type of feature in flipkart or any other shopping app where we can filter products by color, size, price, etc. Here we are going to create multiple filter options almost similar to flipkart filter option as well as sorting so that we can sort products by name, size and price. Here in this example we’ll also learn the use of Comparator interface for sorting.

So, here is the code

MainActivity.java

package com.zatackcoder.filtersortexample;

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.RadioGroup;

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

import com.zatackcoder.filtersortexample.adaptors.ItemAdapter;
import com.zatackcoder.filtersortexample.classes.Filter;
import com.zatackcoder.filtersortexample.classes.Item;

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

public class MainActivity extends AppCompatActivity {

    List<Item> items = new ArrayList<Item>();
    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

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

        mRecyclerView = findViewById(R.id.recycler_view);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);

        items.add(new Item("Item 1", "Red", 10, 100.00));
        items.add(new Item("Item 2", "Red", 12, 100.00));
        items.add(new Item("Item 3", "Red", 14, 100.00));
        items.add(new Item("Item 4", "Red", 16, 150.00));
        items.add(new Item("Item 5", "Red", 18, 170.00));
        items.add(new Item("Item 6", "Green", 20, 190.00));
        items.add(new Item("Item 7", "Green", 10, 100.00));
        items.add(new Item("Item 8", "Green", 12, 200.00));
        items.add(new Item("Item 9", "Green", 14, 210.00));
        items.add(new Item("Item 10", "Green", 16, 240.00));
        items.add(new Item("Item 11", "Blue", 18, 250.00));
        items.add(new Item("Item 12", "Blue", 20, 280.00));
        items.add(new Item("Item 13", "Blue", 10, 300.00));
        items.add(new Item("Item 14", "Blue", 12, 150.00));
        items.add(new Item("Item 15", "White", 10, 170.00));

        if (!Preferences.filters.isEmpty()) {
            ArrayList<Item> filteredItems = new ArrayList<Item>();
            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);

        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(MainActivity.this, FilterActivity.class));
            }
        });

        RadioGroup sortRG = findViewById(R.id.sortRG);
        sortRG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                    case R.id.sortByName:
                        Item[] itemsArr1 = new Item[items.size()];
                        itemsArr1 = items.toArray(itemsArr1);
                        Arrays.sort(itemsArr1, Item.nameComparator);
                        items = Arrays.asList(itemsArr1);
                        mAdapter = new ItemAdapter(getApplicationContext(), items);
                        mRecyclerView.setAdapter(mAdapter);
                        break;
                    case R.id.sortBySize:
                        Item[] itemsArr2 = new Item[items.size()];
                        itemsArr2 = items.toArray(itemsArr2);
                        Arrays.sort(itemsArr2, Item.sizeComparator);
                        items = Arrays.asList(itemsArr2);
                        mAdapter = new ItemAdapter(getApplicationContext(), items);
                        mRecyclerView.setAdapter(mAdapter);
                        break;
                    case R.id.sortByPrice:
                        Item[] itemsArr3 = new Item[items.size()];
                        itemsArr3 = items.toArray(itemsArr3);
                        Arrays.sort(itemsArr3, Item.priceComparator);
                        items = Arrays.asList(itemsArr3);
                        mAdapter = new ItemAdapter(getApplicationContext(), items);
                        mRecyclerView.setAdapter(mAdapter);
                        break;

                }
                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.valueOf(tmpPrices[0]) && price <= Double.valueOf(tmpPrices[1])) {
                flag = true;
                break;
            }
        }
        return flag;
    }
}

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package com.zatackcoder.filtersortexample;

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.RadioGroup;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortexample.adaptors.ItemAdapter;

import com.zatackcoder.filtersortexample.classes.Filter;

import com.zatackcoder.filtersortexample.classes.Item;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class MainActivity extends AppCompatActivity {

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

private RecyclerView mRecyclerView;

private RecyclerView.Adapter mAdapter;

private RecyclerView.LayoutManager mLayoutManager;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mRecyclerView = findViewById(R.id.recycler_view);

mRecyclerView.setHasFixedSize(true);

mLayoutManager = new LinearLayoutManager(this);

mRecyclerView.setLayoutManager(mLayoutManager);

items.add(new Item("Item 1", "Red", 10, 100.00));

items.add(new Item("Item 2", "Red", 12, 100.00));

items.add(new Item("Item 3", "Red", 14, 100.00));

items.add(new Item("Item 4", "Red", 16, 150.00));

items.add(new Item("Item 5", "Red", 18, 170.00));

items.add(new Item("Item 6", "Green", 20, 190.00));

items.add(new Item("Item 7", "Green", 10, 100.00));

items.add(new Item("Item 8", "Green", 12, 200.00));

items.add(new Item("Item 9", "Green", 14, 210.00));

items.add(new Item("Item 10", "Green", 16, 240.00));

items.add(new Item("Item 11", "Blue", 18, 250.00));

items.add(new Item("Item 12", "Blue", 20, 280.00));

items.add(new Item("Item 13", "Blue", 10, 300.00));

items.add(new Item("Item 14", "Blue", 12, 150.00));

items.add(new Item("Item 15", "White", 10, 170.00));

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

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

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);

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(MainActivity.this, FilterActivity.class));

}

});

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

sortRG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

switch (checkedId) {

case R.id.sortByName:

Item[] itemsArr1 = new Item[items.size()];

itemsArr1 = items.toArray(itemsArr1);

Arrays.sort(itemsArr1, Item.nameComparator);

items = Arrays.asList(itemsArr1);

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

mRecyclerView.setAdapter(mAdapter);

break;

case R.id.sortBySize:

Item[] itemsArr2 = new Item[items.size()];

itemsArr2 = items.toArray(itemsArr2);

Arrays.sort(itemsArr2, Item.sizeComparator);

items = Arrays.asList(itemsArr2);

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

mRecyclerView.setAdapter(mAdapter);

break;

case R.id.sortByPrice:

Item[] itemsArr3 = new Item[items.size()];

itemsArr3 = items.toArray(itemsArr3);

Arrays.sort(itemsArr3, Item.priceComparator);

items = Arrays.asList(itemsArr3);

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

mRecyclerView.setAdapter(mAdapter);

break;

}

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.valueOf(tmpPrices[0]) && price <= Double.valueOf(tmpPrices[1])) {

flag = true;

break;

}

return flag;

}

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: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" />

                <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>

</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: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: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" />

<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>

</androidx.constraintlayout.widget.ConstraintLayout>

FilterActivity.java

package com.zatackcoder.filtersortexample;

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

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

public class FilterActivity extends AppCompatActivity {

    RecyclerView filterRV;
    RecyclerView filterValuesRV;
    FilterAdapter filterAdapter;

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

        initControls();
    }

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

        List<String> colors = Arrays.asList(new String[]{"Red", "Green", "Blue", "White"});
        if (!Preferences.filters.containsKey(Filter.INDEX_COLOR)) {
            Preferences.filters.put(Filter.INDEX_COLOR, new Filter("Color", colors, new ArrayList()));
        }
        List<String> sizes = Arrays.asList(new String[]{"10", "12", "14", "16", "18", "20"});
        if (!Preferences.filters.containsKey(Filter.INDEX_SIZE)) {
            Preferences.filters.put(Filter.INDEX_SIZE, new Filter("Size", sizes, new ArrayList()));
        }
        List<String> prices = Arrays.asList(new String[]{"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 = new FilterAdapter(getApplicationContext(), 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, MainActivity.class));
            }
        });

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

package com.zatackcoder.filtersortexample;

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.filtersortexample.adaptors.FilterAdapter;

import com.zatackcoder.filtersortexample.classes.Filter;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class FilterActivity extends AppCompatActivity {

RecyclerView filterRV;

RecyclerView filterValuesRV;

FilterAdapter filterAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_filter);

initControls();

}

private void initControls() {

filterRV = findViewById(R.id.filterRV);

filterValuesRV = findViewById(R.id.filterValuesRV);

filterRV.setLayoutManager(new LinearLayoutManager(this));

filterValuesRV.setLayoutManager(new LinearLayoutManager(this));

List<String> colors = Arrays.asList(new String[]{"Red", "Green", "Blue", "White"});

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

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

}

List<String> sizes = Arrays.asList(new String[]{"10", "12", "14", "16", "18", "20"});

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

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

}

List<String> prices = Arrays.asList(new String[]{"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 = new FilterAdapter(getApplicationContext(), 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, MainActivity.class));

}

});

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

applyB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

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

}

});

}

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>

ItemAdapter.java

package com.zatackcoder.filtersortexample.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.filtersortexample.R;
import com.zatackcoder.filtersortexample.classes.Item;

import java.util.List;

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

    private Context context;
    private List<Item> items;

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

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

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int position) {
        myViewHolder.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();
            }
        });
        myViewHolder.name.setText(items.get(position).getName());
        myViewHolder.color.setText("Color: " + items.get(position).getColor());
        myViewHolder.size.setText("Size: " + items.get(position).getSize());
        myViewHolder.price.setText("Price: " + items.get(position).getPrice());
    }

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

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

        public MyViewHolder(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.filtersortexample.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.filtersortexample.R;

import com.zatackcoder.filtersortexample.classes.Item;

import java.util.List;

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

private Context context;

private List<Item> items;

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

this.context = context;

this.items = items;

}

@NonNull

@Override

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

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

MyViewHolder mvh = new MyViewHolder(view);

return mvh;

}

@Override

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

myViewHolder.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();

}

});

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

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

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

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

}

@Override

public int getItemCount() {

return items.size();

}

public static class MyViewHolder extends RecyclerView.ViewHolder {

View container;

TextView name;

TextView color;

TextView size;

TextView price;

public MyViewHolder(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">

    <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">

<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>

FilterAdapter.java

package com.zatackcoder.filtersortexample.adaptors;

import android.content.Context;
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.filtersortexample.classes.Filter;
import com.zatackcoder.filtersortexample.R;

import java.util.HashMap;

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

    private Context context;
    private HashMap<Integer, Filter> filters;
    private RecyclerView filterValuesRV;
    private int selectedPostion = 0;

    public FilterAdapter(Context context, HashMap<Integer, Filter> filters, RecyclerView filterValuesRV) {
        this.context = context;
        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);
        MyViewHolder mvh = new MyViewHolder(view);
        return mvh;
    }

    @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(context, position));
                selectedPostion = position;
                notifyDataSetChanged();
            }
        });

        filterValuesRV.setAdapter(new FilterValuesAdapter(context, selectedPostion));
        myViewHolder.container.setBackgroundColor(selectedPostion == 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 {
        View container;
        TextView title;

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

}

package com.zatackcoder.filtersortexample.adaptors;

import android.content.Context;

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.filtersortexample.classes.Filter;

import com.zatackcoder.filtersortexample.R;

import java.util.HashMap;

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

private Context context;

private HashMap<Integer, Filter> filters;

private RecyclerView filterValuesRV;

private int selectedPostion = 0;

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

this.context = context;

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);

MyViewHolder mvh = new MyViewHolder(view);

return mvh;

}

@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(context, position));

selectedPostion = position;

notifyDataSetChanged();

}

});

filterValuesRV.setAdapter(new FilterValuesAdapter(context, selectedPostion));

myViewHolder.container.setBackgroundColor(selectedPostion == 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 {

View container;

TextView title;

public 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.filtersortexample.adaptors;

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

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

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

import java.util.List;

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

    private Context context;
    private Integer filterIndex;

    public FilterValuesAdapter(Context context, Integer filterIndex) {
        this.context = context;
        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);
        MyViewHolder mvh = new MyViewHolder(view);
        return mvh;
    }

    @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 {
        View container;
        CheckBox value;

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

}

package com.zatackcoder.filtersortexample.adaptors;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.CheckBox;

import android.widget.Toast;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import com.zatackcoder.filtersortexample.Preferences;

import com.zatackcoder.filtersortexample.R;

import com.zatackcoder.filtersortexample.classes.Filter;

import java.util.List;

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

private Context context;

private Integer filterIndex;

public FilterValuesAdapter(Context context, Integer filterIndex) {

this.context = context;

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);

MyViewHolder mvh = new MyViewHolder(view);

return mvh;

}

@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 {

View container;

CheckBox value;

public MyViewHolder(View view) {

super(view);

container = 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">

    <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">

<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>

Item.java

package com.zatackcoder.filtersortexample.classes;

import java.util.Comparator;

public class Item {
    public static Comparator<Item> nameComparator = new Comparator<Item>() {
        @Override
        public int compare(Item o1, Item o2) {
            return o1.getName().compareTo(o2.getName());
        }
    };
    public static Comparator<Item> sizeComparator = new Comparator<Item>() {
        @Override
        public int compare(Item o1, Item o2) {
            return o1.getSize() - o2.getSize();
        }
    };
    public static Comparator<Item> priceComparator = new Comparator<Item>() {
        @Override
        public int compare(Item o1, Item o2) {
            return (int) (o1.getPrice() - o2.getPrice());
        }
    };
    private String name;
    private String color;
    private Integer size;
    private Double price;

    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;
    }

    public void setSize(Integer size) {
        this.size = size;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }
}

package com.zatackcoder.filtersortexample.classes;

import java.util.Comparator;

public class Item {

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

@Override

public int compare(Item o1, Item o2) {

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

}

};

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

@Override

public int compare(Item o1, Item o2) {

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

}

};

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

@Override

public int compare(Item o1, Item o2) {

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

}

};

private String name;

private String color;

private Integer size;

private Double price;

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;

}

public void setSize(Integer size) {

this.size = size;

}

public Double getPrice() {

return price;

}

public void setPrice(Double price) {

this.price = price;

}

Filter.java

package com.zatackcoder.filtersortexample.classes;

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

public class Filter {
    public static Integer INDEX_COLOR = 0;
    public static Integer INDEX_SIZE = 1;
    public static 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.filtersortexample.classes;

import java.util.ArrayList;

import java.util.List;

public class Filter {

public static Integer INDEX_COLOR = 0;

public static Integer INDEX_SIZE = 1;

public static 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;

}

Preferences.java

package com.zatackcoder.filtersortexample;

import com.zatackcoder.filtersortexample.classes.Filter;

import java.util.HashMap;

public abstract class Preferences {
    public  static HashMap<Integer, Filter> filters = new HashMap<>();
}

package com.zatackcoder.filtersortexample;

import com.zatackcoder.filtersortexample.classes.Filter;

import java.util.HashMap;

public abstract class Preferences {

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

}

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FilterSortExample AndroidStudio Project

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