How to use the Filtering on RecycleView in Android Studio.

Creating New Project.
Open android studio and create a new project.

File => New => New Project => Configure your new project => Select the form factor yours app will run on => Add an Activity to Mobile => Customize the Activity => Finish.

First we need to add Library to our project.  
compile 'com.android.support:recyclerview-v7:25.2.0'
compile 'com.android.support:design:25.2.0'

Create Xml file in project.    
Open => app => res => layout - activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.gswebtechnologies.recycleviewfiltering.MainActivity">

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

        <SearchView
            android:id="@+id/searchView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycleView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="12dp" />


    </LinearLayout>
</RelativeLayout>
   

Create the Java file in project.
Open app => main => src = MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.SearchView;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {
    private static final String TAG = "MainActivity";
    RecyclerView recyclerView;
    SearchView searchView;
    RecycleViewAdapter recycleViewAdapter;
    private ArrayList<ListItem> listItems;

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

        //getting the widget id
        init();
        //using the click listner in android
        listener();
        //set the data in listView
        setList();
        //SearchView
        setSearchView();

        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recycleViewAdapter = new RecycleViewAdapter(this, listItems);
        recyclerView.setAdapter(recycleViewAdapter);

    }

    private void setSearchView() {
        searchView.setIconifiedByDefault(false);
        searchView.setOnQueryTextListener(this);
        searchView.setSubmitButtonEnabled(true);
        searchView.setQueryHint("Search Here");
    }

    private void init() {
        recyclerView = (RecyclerView) findViewById(R.id.recycleView);
        //SearchView
        searchView = (SearchView) findViewById(R.id.searchView);
    }

    private void listener() {

    }

    public void setList() {

        listItems = new ArrayList<ListItem>();

        ListItem item = new ListItem();
        item.setData("Google");
        listItems.add(item);

        item = new ListItem();
        item.setData("Arun");
        listItems.add(item);

        item = new ListItem();
        item.setData("Kamal");
        listItems.add(item);

        item = new ListItem();
        item.setData("Balvinder");
        listItems.add(item);

        item = new ListItem();
        item.setData("Manjeet");
        listItems.add(item);


    }

    @Override
    public boolean onQueryTextSubmit(String query) {
        return false;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        recycleViewAdapter.filter(newText);
        return true;
    }
}

Create the Java file in project.
Open app => main => src = RecycleViewAdapter.java
import android.app.Activity;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;



public class RecycleViewAdapter extends RecyclerView.Adapter<MyCustomViewHolder>{

    private List<ListItem> listItems, filterList;
    private Context mContext;

    public RecycleViewAdapter(Context context, List<ListItem> listItems) {
        this.listItems = listItems;
        this.mContext = context;
        this.filterList = new ArrayList<ListItem>();
        // we copy the original list to the filter list and use it for setting row values
        this.filterList.addAll(this.listItems);
    }

    @Override
    public MyCustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_item, null);
        MyCustomViewHolder viewHolder = new MyCustomViewHolder(view);
        return viewHolder;

    }

    @Override
    public void onBindViewHolder(MyCustomViewHolder customViewHolder, int position) {

        ListItem listItem = filterList.get(position);
        customViewHolder.tvName.setText(listItem.name);


    }

    @Override
    public int getItemCount() {
        return (null != filterList ? filterList.size() : 0);
    }

    // Do Search...
    public void filter(final String text) {

        // Searching could be complex..so we will dispatch it to a different thread...
        new Thread(new Runnable() {
            @Override
            public void run() {

                // Clear the filter list
                filterList.clear();

                // If there is no search value, then add all original list items to filter list
                if (TextUtils.isEmpty(text)) {

                    filterList.addAll(listItems);

                } else {
                    // Iterate in the original List and add it to filter list...
                    for (ListItem item : listItems) {
                        if (item.name.toLowerCase().contains(text.toLowerCase()) ||
                                item.name.toLowerCase().contains(text.toLowerCase())) {
                            // Adding Matched items
                            filterList.add(item);
                        }
                    }
                }

                // Set on UI Thread
                ((Activity) mContext).runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        // Notify the List that the DataSet has changed...
                        notifyDataSetChanged();
                    }
                });

            }
        }).start();

    }
}


Create the Java file in project.
Open app => main => src = MyCustomViewHolder.java

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

public class MyCustomViewHolder extends RecyclerView.ViewHolder {

    protected ImageView imageView;
    protected TextView tvName, tvPlace;
    protected ImageView imgThumb;

    public MyCustomViewHolder(View view) {
        super(view);
        this.tvName = (TextView) view.findViewById(R.id.txtName);

    }
}  

Create the Java file in project.
Open app => main => src = ListItem.java


public class ListItem {
    public String getName() {
        return name;
    }

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

    String name;


    public void setData(String name){
        this.name=name;

    }
}

May this code help you. Thanks!!!!!!