RecyclerView Load On Scroll in Android

Post Views: 5,579

Hello Friends, today we are going to see and example of recyclerview load on scroll in Android. Basically we are going to implement infinite scroll in recyclerview here and the basic function of this code is to load more data on scroll when we reaches to the end while scrolling the recyclerview. In this example we are going to generate data using for loop but we can also load data through webservice by just modifying loadMoreData method accordingly.

So, Here is the code

MainActivity.java

package com.zatackcoder.recyclerviewloadonscroll;

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

import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private ArrayList items = new ArrayList<String>();
    private ProgressBar mProgressBar;

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

        initControls();
        loadData();
    }

    private void initControls() {
        mRecyclerView = findViewById(R.id.recycler_view);
        mProgressBar = findViewById(R.id.progress_bar);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

                LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

                if (!mProgressBar.isShown()) {
                    if (linearLayoutManager != null && linearLayoutManager.findLastCompletelyVisibleItemPosition() == items.size() - 1) {
                        mProgressBar.setVisibility(View.VISIBLE);
                        loadMoreData();
                    }
                }
            }
        });
        mAdapter = new MyAdapter(getApplicationContext(), items);
        mRecyclerView.setAdapter(mAdapter);
    }

    private void loadData() {
        for(int i = 1; i <= 15; i++) {
            items.add("Item " + i);
        }
        mAdapter.notifyDataSetChanged();
    }

    private void loadMoreData() {
        int count = items.size();
        for(int i = 1; i < 15; i++) {
            items.add("Item " + (count + i));
        }
        mAdapter.notifyDataSetChanged();
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                mProgressBar.setVisibility(View.GONE);
            }
        }, 1000);
    }
}

package com.zatackcoder.recyclerviewloadonscroll;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import android.os.Handler;

import android.view.View;

import android.widget.ProgressBar;

import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

private RecyclerView mRecyclerView;

private RecyclerView.Adapter mAdapter;

private ArrayList items = new ArrayList<String>();

private ProgressBar mProgressBar;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initControls();

loadData();

}

private void initControls() {

mRecyclerView = findViewById(R.id.recycler_view);

mProgressBar = findViewById(R.id.progress_bar);

mRecyclerView.setHasFixedSize(true);

mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

@Override

public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {

super.onScrolled(recyclerView, dx, dy);

LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

if (!mProgressBar.isShown()) {

if (linearLayoutManager != null && linearLayoutManager.findLastCompletelyVisibleItemPosition() == items.size() - 1) {

mProgressBar.setVisibility(View.VISIBLE);

loadMoreData();

}

});

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

mRecyclerView.setAdapter(mAdapter);

}

private void loadData() {

for(int i = 1; i <= 15; i++) {

items.add("Item " + i);

}

mAdapter.notifyDataSetChanged();

}

private void loadMoreData() {

int count = items.size();

for(int i = 1; i < 15; i++) {

items.add("Item " + (count + i));

}

mAdapter.notifyDataSetChanged();

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

mProgressBar.setVisibility(View.GONE);

}

}, 1000);

}

activity_main.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=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintVertical_weight="1"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="1dp" />

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

</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: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=".MainActivity">

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/recycler_view"

android:layout_width="match_parent"

android:layout_height="match_parent"

app:layout_constraintVertical_weight="1"

tools:layout_editor_absoluteX="1dp"

tools:layout_editor_absoluteY="1dp" />

<ProgressBar

android:id="@+id/progress_bar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="#fff"

android:visibility="gone"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

MyAdapter.java

package com.zatackcoder.recyclerviewloadonscroll;

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 java.util.ArrayList;


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

    private Context context;
    private ArrayList<String> items;

    public MyAdapter(Context context, ArrayList<String> 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 list_item which has index " + position + " and title " + items.get(position);
                Toast.makeText(context, message, Toast.LENGTH_LONG).show();
            }
        });
        myViewHolder.title.setText(items.get(position));
    }

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

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        // each data list_item is just a string in this case
        View container;
        TextView title;

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

package com.zatackcoder.recyclerviewloadonscroll;

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 java.util.ArrayList;

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

private Context context;

private ArrayList<String> items;

public MyAdapter(Context context, ArrayList<String> 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 list_item which has index " + position + " and title " + items.get(position);

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

}

});

myViewHolder.title.setText(items.get(position));

}

@Override

public int getItemCount() {

return items.size();

}

public static class MyViewHolder extends RecyclerView.ViewHolder {

// each data list_item is just a string in this case

View container;

TextView title;

public MyViewHolder(View view) {

super(view);

container = view;

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

}

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="#fff"
    android:orientation="vertical">

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?android:attr/selectableItemBackground"
        android:padding="5dp"
        android:text="Title"
        android:textSize="25dp" />

</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="#fff"

android:orientation="vertical">

<TextView

android:id="@+id/title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

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

android:padding="5dp"

android:text="Title"

android:textSize="25dp" />

</LinearLayout>

Video

AndroidStudio Project Download

RecyclerViewLoadOnScroll AndroidStudio Project

1 file(s) 10.38 MB

Download

Thanks for Stoping by
If you find this helpful then please do share

RecyclerView Load On Scroll in Android

MainActivity.java

activity_main.xml

MyAdapter.java

list_item.xml

Video

AndroidStudio Project Download

RecyclerViewLoadOnScroll AndroidStudio Project

Comments

Leave a Reply Cancel reply