How to update RecyclerView Adapter Data with notifyDatasetChanged()

In this android programming source code example, we are going to explore how to update RecyclerView adapter data with notifyDatasetChanged()method.

Below is a step by step source code on how to update RecyclerView adapter data with notifyDatasetChanged()method in android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Update Data"
        android:textStyle="bold"
        android:background="@color/colorAccent"
        android:textColor="@color/white"
        android:onClick="update"
        android:layout_alignParentBottom="true"/>

</RelativeLayout>

MainActivity.java

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
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 RecyclerViewActivity10 extends AppCompatActivity {
    private RecyclerView list;
    private adapter recyclerAdapter;
    private ArrayList<String> country;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycler_view10);
        list = (RecyclerView) findViewById(R.id.list);

        //Data
        country = new ArrayList<>();
        country.add("Nigeria");
        country.add("China");
        country.add("USA");
        country.add("Ghana");
        country.add("Canada");
        country.add("Finland");

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        list.setLayoutManager(layoutManager);
        recyclerAdapter = new adapter(RecyclerViewActivity10.this, country);
        list.addItemDecoration(new DividerItemDecoration(list.getContext(), layoutManager.getOrientation()));
        list.setAdapter(recyclerAdapter);
    }

    private class adapter extends RecyclerView.Adapter<adapter.myViewHolder> {
        Context context;
        List<String> mData;
        public adapter(Context context, List<String> data) {
            this.context = context;
            this.mData = data;
        }
        @Override
        public adapter.myViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(context).inflate(R.layout.recyclerview_adapter1, parent, false);
            return new myViewHolder(view);
        }
        @Override
        public void onBindViewHolder(adapter.myViewHolder holder, int position) {
            holder.country.setText(mData.get(position));
        }
        @Override
        public int getItemCount() {
            return mData.size();
        }
        public class myViewHolder extends RecyclerView.ViewHolder {
            TextView country;
            public myViewHolder(View itemView) {
                super(itemView);
                country = (TextView) itemView.findViewById(R.id.country);
            }
        }
    }

    public void update(View view){
        country.add("Denmark");
        country.add("Argentina");
        country.add("Andorra");
        country.add("Togo");
        recyclerAdapter.notifyDataSetChanged();
    }
}

android adapter data

If you have any questions or suggestions kindly use the comment box or you can contact us directly through our contact page below.

 

Add a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

50% Discounts On Projects

Do you have a custom project with a clear requirements, we are currently giving a 50% discount on all projects.

We will work with you to ensure we deliver what you need.

If you have questions or want to chat with us, you can reach us on Skype (henry.tochi)

Languages and technologies we use - Java, Kotlin, Laravel, Vue, React, Flutter, Swift and more.