SwipeRefreshLayout, work with RecyclerView

Last two post show "Simple example of using SwipeRefreshLayout" and "SwipeRefreshLayout, refresh in background thread", target to ListView.

This example show how SwipeRefreshLayout work with RecyclerView (reference: step-by-step of using RecyclerView).


To use RecyclerView in your Android Studio project, you have to Add Support Libraries of RecyclerView as dependencies.

Create layout/layout_item.xml, to define the layout of RecyclerView item.

<?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:orientation="vertical">

    <TextView
        android:id="@+id/item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="28dp"/>

</LinearLayout>

Create a new class, RecyclerViewAdapter.java.

package com.blogspot.android_er.androidswiperefresh;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ItemHolder>{

    private List<String> itemsList;
    private OnItemClickListener onItemClickListener;
    private LayoutInflater layoutInflater;

    public RecyclerViewAdapter(Context context){
        layoutInflater = LayoutInflater.from(context);
        itemsList = new ArrayList<String>();
    }

    @Override
    public ItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = layoutInflater.inflate(R.layout.layout_item, parent, false);
        return new ItemHolder(itemView, this);
    }

    @Override
    public void onBindViewHolder(ItemHolder holder, int position) {
        holder.setItemText(itemsList.get(position));
    }

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

    public void setOnItemClickListener(OnItemClickListener listener){
        onItemClickListener = listener;
    }

    public OnItemClickListener getOnItemClickListener(){
        return onItemClickListener;
    }

    public interface OnItemClickListener{
        public void onItemClick(ItemHolder item, int position);
    }

    public void add(int location, String iString){
        itemsList.add(location, iString);
        notifyItemInserted(location);
    }

    public void set(int location, String iString){
        itemsList.set(location, iString);
        notifyItemChanged(location);
    }

    public void clear(){
        itemsList.clear();
        notifyDataSetChanged();
    }

    public static class ItemHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        private RecyclerViewAdapter parent;
        TextView textItemText;

        public ItemHolder(View itemView, RecyclerViewAdapter parent) {
            super(itemView);
            itemView.setOnClickListener(this);
            this.parent = parent;
            textItemText = (TextView) itemView.findViewById(R.id.item_text);
        }

        public void setItemText(CharSequence itemString){
            textItemText.setText(itemString);
        }

        public CharSequence getItemText(){
            return textItemText.getText();
        }

        @Override
        public void onClick(View v) {
            final OnItemClickListener listener = parent.getOnItemClickListener();
            if(listener != null){
                listener.onItemClick(this, getAdapterPosition());
            }
        }
    }
}

Modify layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:padding="16dp"
    android:orientation="vertical"
    tools:context="com.blogspot.android_er.androidswiperefresh.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/clearall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Clear All"/>

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swiperefreshlayout"
        android:layout_height="match_parent"
        android:layout_width="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/myrecyclerview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

    </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

MainActivity.java

package com.blogspot.android_er.androidswiperefresh;

import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.text.DateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity implements RecyclerViewAdapter.OnItemClickListener{

    SwipeRefreshLayout swipeRefreshLayout;
    Button btnClearAll;

    private RecyclerView myRecyclerView;
    private LinearLayoutManager linearLayoutManager;
    private RecyclerViewAdapter myRecyclerViewAdapter;

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

        swipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swiperefreshlayout);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                refresh();
            }
        });
        btnClearAll = (Button)findViewById(R.id.clearall);
        btnClearAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //In order to prevent the racing condition of updating removed item in refreshing,
                //disable "Clear All" if refreshing
                if(!swipeRefreshLayout.isRefreshing()){
                    myRecyclerViewAdapter.clear();
                }
            }
        });

        myRecyclerView = (RecyclerView)findViewById(R.id.myrecyclerview);
        linearLayoutManager =
                new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        myRecyclerViewAdapter = new RecyclerViewAdapter(this);
        myRecyclerViewAdapter.setOnItemClickListener(this);
        myRecyclerView.setAdapter(myRecyclerViewAdapter);
        myRecyclerView.setLayoutManager(linearLayoutManager);

    }

    private void refresh(){

        final int pos = myRecyclerViewAdapter.getItemCount();
        myRecyclerViewAdapter.add(pos, "Refreshing...");
        swipeRefreshLayout.setRefreshing(true);

        //refresh long-time task in background thread
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    //dummy delay for 2 second
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                //update ui on UI thread
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        String currentDateTime =
                                DateFormat.getDateTimeInstance().format(new Date());

                        myRecyclerViewAdapter.set(pos, pos + " - " + currentDateTime);
                        swipeRefreshLayout.setRefreshing(false);
                    }
                });

            }
        }).start();
    }

    @Override
    public void onItemClick(RecyclerViewAdapter.ItemHolder item, int position) {
        Toast.makeText(this,
                position + " : " + item.getItemText(),
                Toast.LENGTH_SHORT).show();
    }
}

Download the files .

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