How do I make my button which is fixed at the bottom of a layout scroll, once the recyclerview on top grows in size

Question

I have a very basic yet difficult issue where I have a button fixed at the bottom of the view, but below recyclerview container. Once the container size grows, I want the button to go below the recyclerview (scrollable) instead of being fixed at the bottom of the view.Is there a way to achieve this?

I have looked online for a couple of ideas but didn't find anything quite like it yet.

i am basically using

 <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    android:background="@color/white"
    android:clickable="false">

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/cl_root_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipChildren="false">

        <LinearLayout
            android:id="@+id/activity_g"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <android.support.design.widget.AppBarLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:elevation="0dp">


                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    app:subtitleTextColor="@color/white"
                    app:titleTextAppearance="@style/Toolbar.TitleText"
                    app:titleTextColor="@color/white">


                    <TextView
                        android:id="@+id/nav_back_btn"
                        style="@style/Body1RegLeftBlack"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="20dp"
                        android:layout_marginStart="@dimen/activity_horizontal_margin"
                        android:gravity="center_horizontal"
                        android:background="@drawable/ic_backarrow" />

                    <TextView
                        android:id="@+id/g_main_title"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="18dp"
                        android:layout_marginTop="15dp"
                        android:letterSpacing="0.01"
                        android:gravity="center_horizontal"
                        android:text="@string/g"
                        android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
                        android:textColor="#de000000"
                        android:textSize="20sp"
                        android:textStyle="normal"

                        />

                </android.support.v7.widget.Toolbar>


            </android.support.design.widget.AppBarLayout>

            <android.support.v4.widget.NestedScrollView
                android:id="@+id/info_scrollview"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:id="@+id/infoContainer"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:clickable="false"
                    android:orientation="vertical">

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="30dp">

                        <TextView
                            android:id="@+id/info_location"
                            style="@style/Headline2LeftBlack"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginStart="@dimen/activity_horizontal_margin"
                            android:textAppearance="@style/TextAppearance.Text.Chronicle"
                            android:textSize="28sp"
                            tools:text="@string/five_thirty_fifth_ave" />

                        <TextView
                            style="@style/Body1RegRightRed"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignBaseline="@+id/info_location"
                            android:layout_alignParentEnd="true"
                            android:layout_marginEnd="@dimen/activity_horizontal_margin"
                            android:layout_toEndOf="@+id/info_location"
                            android:text="@string/location_change"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:visibility="gone" />
                    </RelativeLayout>

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="48dp"
                        android:layout_marginTop="44dp"
                        android:gravity="center_vertical"
                        android:weightSum="2">

                        <TextView
                            style="@style/Body1RegLeftBlack"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginStart="16dp"
                            android:layout_weight="1"
                            android:id="@+id/g_start_date"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:text="@string/g_start_date" />

                        <TextView
                            style="@style/Body1RegRightBlack"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginEnd="16dp"
                            android:layout_weight="1"
                            android:id="@+id/g_start_time"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:text="@string/g_start_time" />
                    </LinearLayout>

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="@color/registerUserSeparatorColor" />

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="48dp"
                        android:gravity="center_vertical"
                        android:weightSum="2">

                        <TextView
                            style="@style/Body1RegLeftBlack"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginStart="16dp"
                            android:layout_weight="1"
                            android:id="@+id/g_end_date"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:visibility="invisible"
                            android:text="@string/g_end_date" />

                        <TextView
                            style="@style/Body1RegRightBlack"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginEnd="16dp"
                            android:layout_weight="1"
                            android:id="@+id/g_end_time"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:text="@string/g_end_time" />
                    </LinearLayout>

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="@color/registerUserSeparatorColor" />


                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="16dp"
                        android:layout_marginTop="28dp"
                        android:letterSpacing="0.01"
                        android:lineSpacingExtra="4sp"
                        android:paddingTop="30dp"
                        android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
                        android:textColor="@color/black"
                        android:textSize="20sp"
                        android:textStyle="normal"
                        android:text="@string/g" />


                    <android.support.v7.widget.RecyclerView
                        android:id="@+id/g_item_list"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:overScrollMode="never"
                        android:divider="@null"
                        tools:listitem="@layout/item_g"/>

                    <TextView
                        style="@style/Body1RegLeftRed"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="16sp"
                        android:layout_marginTop="20dp"
                        android:id="@+id/add_g"
                        android:lineHeight="22sp"
                        android:text="@string/add_g"
                        android:textSize="16sp" />

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_marginStart="16dp"
                        android:layout_marginTop="58dp"
                        android:letterSpacing="0.01"
                        android:lineSpacingExtra="4sp"
                        android:visibility="invisible"
                        android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
                        android:textColor="@color/black"
                        android:textSize="20sp"
                        android:textStyle="normal"
                        android:text="@string/arrival_notifications" />

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:visibility="gone"
                        android:id="@+id/text_message_container"
                        android:layout_marginStart="16dp">

                        <TextView
                            android:id="@+id/text_message"
                            style="@style/Body1RegLeftBlack"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginTop="11dp"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:text="@string/text_message" />

                        <TextView
                            style="@style/Body2RegLeftGrey"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/text_message"
                            android:layout_marginTop="2dp"
                            android:id="@+id/tap_phone_number_text"
                            android:textAppearance="@style/TextAppearance.Text.Roboto.Regular"
                            android:text="@string/tap_to_add_a_phone_number" />

                        <android.support.v7.widget.SwitchCompat
                            android:id="@+id/text_message_switch"
                            style="@style/Color1SwitchStyle"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignParentEnd="true"
                            android:layout_centerVertical="true"
                            android:layout_marginEnd="16dp" />
                    </RelativeLayout>
                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:layout_marginStart="16dp"
                        android:visibility="gone"
                        android:layout_marginTop="11dp"
                        android:background="@color/settingsSeparatorLineColor" />


                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:textSize="16sp"
                        android:layout_marginTop="100dp"
                        android:textAppearance="@style/TextAppearance.Text.Roboto.Medium"
                        android:textStyle="normal"

                        android:letterSpacing="0.07"
                        android:lineSpacingExtra="0sp"
                        android:layout_gravity="center"
                        android:layout_marginBottom="30dp"
                        android:id="@+id/submit_btn"
                        android:text="@string/submit_list"
                        />

                </LinearLayout>
            </android.support.v4.widget.NestedScrollView>
        </LinearLayout>
    </android.support.design.widget.CoordinatorLayout>
</android.support.design.widget.CoordinatorLayout>

The problem above is, the submit_list btn doesnt stay fixed, if the recyclerview grows but theres still enough space to spare in the view.

I want to make it such that the button stays fixed and doesnt scroll UNTIL the size of the recyclerview goes beyond a certain limit from the bottom(not visible on the screen anymore), after which the button scrolls relative to the last item of the recyclerview and not aligned to the bottom anymore. any ideas how to go about it?

To give visual examples:

As you can see, initial screen has submit button aligned to the bottom and the rest of the content in place. As I add more users:

It still stays at the bottom since the recyclerview items are still within screen now, aqs soon as i add one more item, causing the list to scroll up :

As seen I want it to go below the recyclerview instead of stay fixed at bottom of the screen (the above screenshots are from ios where it works), was wondering if we can do the same for android?

Answer 1

Create button.xml inside your layout folder and obviously create a button inside it.

Add some things to your adapter:

//This will check if the current position is past the last item in your list, 
//if it is then it will return the button layout value to this method

@Override
public int getItemViewType(int pos) {
return (pos == mItems.size()) ? R.layout.button : R.layout.mItem;
}

And do something like this in your onCreateViewHolder

@Override
public mViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

View itemView;

if(viewType == R.layout.item){
    itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, 
parent, false);
}

else {
    itemView = 
LayoutInflater.from(parent.getContext()).inflate(R.layout.button, parent, 
false);
}

return new mViewHolder(itemView);
}

And in your OnBindViewHolder

@Override
public void onBindViewHolder(mViewHolder mHolder, int pos) {
if(pos == mItems.size()) {
    mHolder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //Do something....
        }
    });
}
else {
    String members = mItems.get(pos);
    mHolder.title.setText(members);
}
}

Also do change your, getItemCount, to get that extra item (in your case, the button)

@Override
public int getItemCount() {
return mItems.size() + 1;
}

Also don't forget to find your button in mViewHolder (you already know that i guess) mButton = (Button) view.findViewById(R.id.button);

This will do the job.

Answer 2

See if this works  

  <?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">
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <android.support.v7.widget.RecyclerView
                android:layout_width="match_parent"
                android:layout_height="match_parent"/>
            <Button
                android:layout_alignParentBottom="true"
                android:text="button"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </RelativeLayout>
        </ScrollView>

    </RelativeLayout>

Answer 3

If you don't want to do pagination then you can try below layout file

<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView 
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">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvItem"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:nestedScrollingEnabled="false"
        tools:itemCount="5"
        tools:listitem="@layout/item_recycler_tasker_home" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/rvItem"
        android:layout_centerHorizontal="true"
        android:text="MyButton" />
</RelativeLayout>

By doing this all the recyclerview's items gets loaded at one go as recyclerView's height is wrap_content it will acquire only height that is required for all items, and then after recyclerview you can see your button

Answer 4

This is a demo link

And a Gif link

public class WeirdStickyBottomActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private TextView mStickyView;
    private LinearLayoutManager mLayoutManager;
    private MyAdapter mAdapter;

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

        mRecyclerView = findViewById(R.id.recyclerview);
        mStickyView = findViewById(R.id.sticky);
        Button mAddButton = findViewById(R.id.button_add);
        Button mDeleteButton = findViewById(R.id.button_delete);

        mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
        mAdapter = new MyAdapter(this);
        mRecyclerView.setAdapter(mAdapter);
        hideStickyLayoutIfNeed();

        mAddButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAdapter.addItems();
                hideStickyLayoutIfNeed();
            }
        });

        mDeleteButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAdapter.deleteItems();
                hideStickyLayoutIfNeed();
            }
        });

        mStickyView.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(WeirdStickyBottomActivity.this, "Sticky Click", Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void hideStickyLayoutIfNeed() {
        mRecyclerView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                mRecyclerView.getViewTreeObserver().removeOnPreDrawListener(this);
                int firstVisible = mLayoutManager.findFirstVisibleItemPosition();
                int lastCompletelyVisible = mLayoutManager.findLastCompletelyVisibleItemPosition();

                //adapter list size display beyond the screen
                if (firstVisible > 0 || lastCompletelyVisible < mAdapter.getItemCount() - 1) {
                    mAdapter.addStickyItem(true);
                    if (mStickyView.getVisibility() == View.VISIBLE) {
                        mStickyView.setVisibility(View.GONE);
                    }
                } else if (firstVisible == 0 && lastCompletelyVisible == mAdapter.getItemCount() - 1) {
                    if (mStickyView.getVisibility() != View.VISIBLE) {
                        mStickyView.setVisibility(View.VISIBLE);
                    }
                }
                mRecyclerView.smoothScrollToPosition(mAdapter.getItemCount() - 1);
                return true;
            }
        });
    }

    private static class MyAdapter extends RecyclerView.Adapter<ItemHolder> {

        private int mStickyIndex = -1;

        static final int HOLDER_TYPE_NORMAL = 1;
        static final int HOLDER_TYPE_STICKY = 2;

        private List<String> dataList = new ArrayList<>();
        private Context mContext;

        MyAdapter(Context context) {
            this.mContext = context;
            addItems();
        }

        public void addItems() {
            boolean hasStickyItem = mStickyIndex > 0;
            if (hasStickyItem) {
                dataList.remove(mStickyIndex);
                mStickyIndex = -1;
            }
            int size = dataList.size();
            for (int i = size; i < size + 5; i++) {
                dataList.add("This is a item");
            }
            notifyDataSetChanged();
        }

        public void deleteItems() {
            int size = dataList.size();
            if (size < 6) {
                return;
            }
            boolean hasStickyItem = mStickyIndex > 0;
            if (hasStickyItem) {
                dataList.remove(mStickyIndex);
                mStickyIndex = -1;
            }
            if (size > size - 5) {
                dataList.subList(size - 5, size - 1).clear();
            }
            notifyDataSetChanged();
        }

        public void addStickyItem(boolean notify) {
            //did not add sticky item before
            if (mStickyIndex <= 0) {
                mStickyIndex = dataList.size();
                dataList.add(mContext.getResources().getString(R.string.sticky_layout));
                if (notify) {
                    notifyDataSetChanged();
                }
            }
        }

        @NonNull
        @Override
        public ItemHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            return ItemHolder.create(parent, viewType == HOLDER_TYPE_STICKY);
        }

        @Override
        public void onBindViewHolder(@NonNull ItemHolder holder, int position) {
            holder.bind(dataList.get(position));
        }

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

        @Override
        public int getItemViewType(int position) {

            if (position == mStickyIndex) {
                return HOLDER_TYPE_STICKY;
            }

            return HOLDER_TYPE_NORMAL;
        }
    }

    private static class ItemHolder extends RecyclerView.ViewHolder {

        private TextView textView;
        private boolean isSticky;

        private ItemHolder(@NonNull View itemView, boolean isSticky) {
            super(itemView);
            textView = itemView.findViewById(R.id.text);
            this.isSticky = isSticky;
        }

        void bind(String text) {
           textView.setText(text);
            if (isSticky) {
                textView.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        Toast.makeText(v.getContext(), "Sticky Click", Toast.LENGTH_SHORT).show();
                    }
                });
                textView.setBackgroundColor(textView.getResources().getColor(R.color.colorPrimary));
            } else {
                textView.setOnClickListener(null);
                textView.setBackgroundColor(Color.WHITE);
            }
        }

        static ItemHolder create(ViewGroup parent, boolean isSticky) {
            return new ItemHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false), isSticky);
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:orientation="vertical"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:layout_behavior="android.support.design.widget.AppBarLayout$Behavior">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:title="Collapse">

            <android.support.v7.widget.Toolbar
                android:id="@+id/tb_toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                app:title="@string/app_name">

                <Button
                    android:id="@+id/button_add"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/button_add" />

                <Button
                    android:id="@+id/button_delete"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/button_delete" />


            </android.support.v7.widget.Toolbar>

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <FrameLayout
        android:id="@+id/sticky_parent"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

        <TextView
            android:id="@+id/sticky"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_gravity="bottom"
            android:background="@color/colorPrimary"
            android:gravity="center"
            android:text="@string/sticky_layout" />

    </FrameLayout>

</android.support.design.widget.CoordinatorLayout>

Answer 5

You can achieve this using ConstraintLayout

SAMPLE CODE

layout file

<?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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/myRecyclerView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        app:layout_constraintBottom_toTopOf="@+id/btnBottom"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_default="wrap"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/btnBottom"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="12dp"
        android:layout_marginRight="20dp"
        android:padding="12dp"
        android:text="Continue"
        android:textAllCaps="false"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:textColor="@android:color/white"
        app:backgroundTint="@color/colorPrimary" />

</androidx.constraintlayout.widget.ConstraintLayout>

Activity code

public class MainActivity extends AppCompatActivity {

    RecyclerView myRecyclerView;
    ArrayList<String> arrayList = new ArrayList<>();
    DataAdapter adapter;

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

        myRecyclerView = findViewById(R.id.myRecyclerView);
        myRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        myRecyclerView.setHasFixedSize(true);

        addDataToList();

        adapter = new DataAdapter(this, arrayList);
        myRecyclerView.setAdapter(adapter);

    }

    private void addDataToList() {
        for (int i = 0; i < 5; i++) {
            arrayList.add("NILU_PILU :-> " + i);
        }
    }

}

DataAdapter class

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

import java.util.ArrayList;

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

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {

    ArrayList<String> arrayList = new ArrayList<>();
    private Context mContext;

    public DataAdapter(Context mContext, ArrayList<String> arrayList) {
        this.mContext = mContext;
        this.arrayList = arrayList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.aaa, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.tvText.setText(arrayList.get(position));
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView tvText;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            tvText = itemView.findViewById(R.id.tvText);
        }
    }
}

OUTPUTS