RecyclerView ItemTouchHelper Buttons on Swipe

Question

I am trying to port some iOS functionality to Android.

I intent to create a table where on swipe to the left shows 2 button: Edit and Delete.

I have been playing with it and I know I am very close. The secret really lies on the method OnChildDraw.

I would like to Draw a Rect that fits the text Delete then draw the Edit text besides it with their respective background color. The remaining white space when clicked should restore the row to its initial position.

I have managed to paint the background while the user is swiping to the sides but I don't know how to add the listeners and once it is swiped to the side, the dragging function begins to misbehave.

I am working on Xamarin but pure java solutions also are accepted as I can easily port them to c#.

    public class SavedPlacesItemTouchHelper : ItemTouchHelper.SimpleCallback
    {
        private SavedPlacesRecyclerviewAdapter adapter;
        private Paint paint = new Paint();
        private Context context;

        public SavedPlacesItemTouchHelper(Context context, SavedPlacesRecyclerviewAdapter adapter) : base(ItemTouchHelper.ActionStateIdle, ItemTouchHelper.Left)
        {
            this.context = context;
            this.adapter = adapter;
        }

        public override bool OnMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target)
        {
            return false;
        }

        public override void OnSwiped(RecyclerView.ViewHolder viewHolder, int direction)
        {
        }

        public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
        {
            float translationX = dX;
            View itemView = viewHolder.ItemView;
            float height = (float)itemView.Bottom - (float)itemView.Top;

            if (actionState == ItemTouchHelper.ActionStateSwipe && dX <= 0) // Swiping Left
            {
                 translationX = -Math.Min(-dX, height * 2);
                paint.Color = Color.Red;
                RectF background = new RectF((float)itemView.Right + translationX, (float)itemView.Top, (float)itemView.Right, (float)itemView.Bottom);
                c.DrawRect(background, paint);

                //viewHolder.ItemView.TranslationX = translationX;
            }
            else if (actionState == ItemTouchHelper.ActionStateSwipe && dX > 0) // Swiping Right
            {
                translationX = Math.Min(dX, height * 2);
                paint.Color = Color.Red;
                RectF background = new RectF((float)itemView.Right + translationX, (float)itemView.Top, (float)itemView.Right, (float)itemView.Bottom);
                c.DrawRect(background, paint);
            }

            base.OnChildDraw(c, recyclerView, viewHolder, translationX, dY, actionState, isCurrentlyActive);
        }
    }
}

This is what I currently have.

If you know how to add listeners or any suggestions please leave a comment!

UPDATE:

I just realized that on double tap on the white remaining space of the row already restore the row to its initial state. Not a single tap though :(

user_2034535 · Answer

Here is the Kotlin version based on the accepted answer approach. With some minor changes I managed to render the buttons width based on the intrinsic size of the text instead of using a fixed width.

Demo project: https://github.com/ntnhon/RecyclerViewRowOptionsDemo

Implementation of SwipeHelper:

import android.annotation.SuppressLint
import android.content.Context
import android.graphics.*
import android.view.MotionEvent
import android.view.View
import androidx.annotation.ColorRes
import androidx.core.content.ContextCompat
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.RecyclerView
import java.util.*
import kotlin.math.abs
import kotlin.math.max

abstract class SwipeHelper(
    private val recyclerView: RecyclerView
) : ItemTouchHelper.SimpleCallback(
    ItemTouchHelper.ACTION_STATE_IDLE,
    ItemTouchHelper.LEFT
) {
    private var swipedPosition = -1
    private val buttonsBuffer: MutableMap> = mutableMapOf()
    private val recoverQueue = object : LinkedList() {
        override fun add(element: Int): Boolean {
            if (contains(element)) return false
            return super.add(element)
        }
    }

    @SuppressLint("ClickableViewAccessibility")
    private val touchListener = View.OnTouchListener { _, event ->
        if (swipedPosition < 0) return@OnTouchListener false
        buttonsBuffer[swipedPosition]?.forEach { it.handle(event) }
        recoverQueue.add(swipedPosition)
        swipedPosition = -1
        recoverSwipedItem()
        true
    }

    init {
        recyclerView.setOnTouchListener(touchListener)
    }

    private fun recoverSwipedItem() {
        while (!recoverQueue.isEmpty()) {
            val position = recoverQueue.poll() ?: return
            recyclerView.adapter?.notifyItemChanged(position)
        }
    }

    private fun drawButtons(
        canvas: Canvas,
        buttons: List,
        itemView: View,
        dX: Float
    ) {
        var right = itemView.right
        buttons.forEach { button ->
            val width = button.intrinsicWidth / buttons.intrinsicWidth() * abs(dX)
            val left = right - width
            button.draw(
                canvas,
                RectF(left, itemView.top.toFloat(), right.toFloat(), itemView.bottom.toFloat())
            )

            right = left.toInt()
        }
    }

    override fun onChildDraw(
        c: Canvas,
        recyclerView: RecyclerView,
        viewHolder: RecyclerView.ViewHolder,
        dX: Float,
        dY: Float,
        actionState: Int,
        isCurrentlyActive: Boolean
    ) {
        val position = viewHolder.adapterPosition
        var maxDX = dX
        val itemView = viewHolder.itemView

        if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
            if (dX < 0) {
                if (!buttonsBuffer.containsKey(position)) {
                    buttonsBuffer[position] = instantiateUnderlayButton(position)
                }

                val buttons = buttonsBuffer[position] ?: return
                if (buttons.isEmpty()) return
                maxDX = max(-buttons.intrinsicWidth(), dX)
                drawButtons(c, buttons, itemView, maxDX)
            }
        }

        super.onChildDraw(
            c,
            recyclerView,
            viewHolder,
            maxDX,
            dY,
            actionState,
            isCurrentlyActive
        )
    }

    override fun onMove(
        recyclerView: RecyclerView,
        viewHolder: RecyclerView.ViewHolder,
        target: RecyclerView.ViewHolder
    ): Boolean {
        return false
    }

    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
        val position = viewHolder.adapterPosition
        if (swipedPosition != position) recoverQueue.add(swipedPosition)
        swipedPosition = position
        recoverSwipedItem()
    }

    abstract fun instantiateUnderlayButton(position: Int): List

    //region UnderlayButton
    interface UnderlayButtonClickListener {
        fun onClick()
    }

    class UnderlayButton(
        private val context: Context,
        private val title: String,
        textSize: Float,
        @ColorRes private val colorRes: Int,
        private val clickListener: UnderlayButtonClickListener
    ) {
        private var clickableRegion: RectF? = null
        private val textSizeInPixel: Float = textSize * context.resources.displayMetrics.density // dp to px
        private val horizontalPadding = 50.0f
        val intrinsicWidth: Float

        init {
            val paint = Paint()
            paint.textSize = textSizeInPixel
            paint.typeface = Typeface.DEFAULT_BOLD
            paint.textAlign = Paint.Align.LEFT
            val titleBounds = Rect()
            paint.getTextBounds(title, 0, title.length, titleBounds)
            intrinsicWidth = titleBounds.width() + 2 * horizontalPadding
        }

        fun draw(canvas: Canvas, rect: RectF) {
            val paint = Paint()

            // Draw background
            paint.color = ContextCompat.getColor(context, colorRes)
            canvas.drawRect(rect, paint)

            // Draw title
            paint.color = ContextCompat.getColor(context, android.R.color.white)
            paint.textSize = textSizeInPixel
            paint.typeface = Typeface.DEFAULT_BOLD
            paint.textAlign = Paint.Align.LEFT

            val titleBounds = Rect()
            paint.getTextBounds(title, 0, title.length, titleBounds)

            val y = rect.height() / 2 + titleBounds.height() / 2 - titleBounds.bottom
            canvas.drawText(title, rect.left + horizontalPadding, rect.top + y, paint)

            clickableRegion = rect
        }

        fun handle(event: MotionEvent) {
            clickableRegion?.let {
                if (it.contains(event.x, event.y)) {
                    clickListener.onClick()
                }
            }
        }
    }
    //endregion
}

private fun List.intrinsicWidth(): Float {
    if (isEmpty()) return 0.0f
    return map { it.intrinsicWidth }.reduce { acc, fl -> acc + fl }
}

Usage:

private fun setUpRecyclerView() {
        binding.recyclerView.adapter = Adapter(listOf(
            "Item 0: No action",
            "Item 1: Delete",
            "Item 2: Delete & Mark as unread",
            "Item 3: Delete, Mark as unread & Archive"
        ))
        binding.recyclerView.addItemDecoration(DividerItemDecoration(this, DividerItemDecoration.VERTICAL))
        binding.recyclerView.layoutManager = LinearLayoutManager(this)

        val itemTouchHelper = ItemTouchHelper(object : SwipeHelper(binding.recyclerView) {
            override fun instantiateUnderlayButton(position: Int): List {
                var buttons = listOf()
                val deleteButton = deleteButton(position)
                val markAsUnreadButton = markAsUnreadButton(position)
                val archiveButton = archiveButton(position)
                when (position) {
                    1 -> buttons = listOf(deleteButton)
                    2 -> buttons = listOf(deleteButton, markAsUnreadButton)
                    3 -> buttons = listOf(deleteButton, markAsUnreadButton, archiveButton)
                    else -> Unit
                }
                return buttons
            }
        })

        itemTouchHelper.attachToRecyclerView(binding.recyclerView)
    }

    private fun toast(text: String) {
        toast?.cancel()
        toast = Toast.makeText(this, text, Toast.LENGTH_SHORT)
        toast?.show()
    }

    private fun deleteButton(position: Int) : SwipeHelper.UnderlayButton {
        return SwipeHelper.UnderlayButton(
            this,
            "Delete",
            14.0f,
            android.R.color.holo_red_light,
            object : SwipeHelper.UnderlayButtonClickListener {
                override fun onClick() {
                    toast("Deleted item $position")
                }
            })
    }

    private fun markAsUnreadButton(position: Int) : SwipeHelper.UnderlayButton {
        return SwipeHelper.UnderlayButton(
            this,
            "Mark as unread",
            14.0f,
            android.R.color.holo_green_light,
            object : SwipeHelper.UnderlayButtonClickListener {
                override fun onClick() {
                    toast("Marked as unread item $position")
                }
            })
    }

    private fun archiveButton(position: Int) : SwipeHelper.UnderlayButton {
        return SwipeHelper.UnderlayButton(
            this,
            "Archive",
            14.0f,
            android.R.color.holo_blue_light,
            object : SwipeHelper.UnderlayButtonClickListener {
                override fun onClick() {
                    toast("Archived item $position")
                }
            })
    }

user_3886821 · Answer

For all those who wanna use a library for this, check this out:

https://github.com/chthai64/SwipeRevealLayout

And, for a stripped down version of this lib, checkout:

https://android.jlelse.eu/android-recyclerview-swipeable-items-46a3c763498d

P.S. You can create any custom layout (even with Image Buttons) as your hidden layout using these.

user_9451458 · Answer

I did the following to be able to draw a drawable instead of text:

In SwipeHelper, I changed

UnderlayButton(String text, int imageResId, int color, UnderlayButtonClickListener clickListener)

to

UnderlayButton(String text, Bitmap bitmap, int color, UnderlayButtonClickListener clickListener)

Of course I removed imageResId and instead created a Bitmap bitmap and passed the constructor variable to it using this.bitmap = bitmap; as the rest of the variables.

In SwipeHelper.onDaw() you may then call drawBitmap() to apply your bitmap to the canvas. For example:
```
c.drawBitmap(bitmap, rect.left, rect.top, p);
```
Where c and p and your Canvas and Paint variables respectively.
In the activity where I call UnderlayButton, I convert my drawable (in my case it is a VectorDrawable) to a bitmap using this method:
```
int idDrawable = R.drawable.ic_delete_white;
Bitmap bitmap = getBitmapFromVectorDrawable(getContext(), idDrawable);
```

What remains to be done is the centring of the icon.

Full onDraw method with text and bitmap both centered:

public void onDraw(Canvas c, RectF rect, int pos){
            Paint p = new Paint();

            // Draw background
            p.setColor(color);
            c.drawRect(rect, p);

            // Draw Text
            p.setColor(Color.WHITE);
            p.setTextSize(24);


            float spaceHeight = 10; // change to whatever you deem looks better
            float textWidth = p.measureText(text);
            Rect bounds = new Rect();
            p.getTextBounds(text, 0, text.length(), bounds);
            float combinedHeight = bitmap.getHeight() + spaceHeight + bounds.height();
            c.drawBitmap(bitmap, rect.centerX() - (bitmap.getWidth() / 2), rect.centerY() - (combinedHeight / 2), null);
            //If you want text as well with bitmap
            c.drawText(text, rect.centerX() - (textWidth / 2), rect.centerY() + (combinedHeight / 2), p);

            clickRegion = rect;
            this.pos = pos;
        }

user_3692155 · Answer

Following Wenxi Zeng's answer here, if you want to have the text in the buttons on multiple lines, replace UnderlayButton's onDraw method with this:

public void onDraw(Canvas canvas, RectF rect, int pos){
        Paint p = new Paint();

        // Draw background
        p.setColor(color);
        canvas.drawRect(rect, p);

        // Draw Text
        TextPaint textPaint = new TextPaint();
        textPaint.setTextSize(UtilitiesOperations.convertDpToPx(getContext(), 15));
        textPaint.setColor(Color.WHITE);
        StaticLayout sl = new StaticLayout(text, textPaint, (int)rect.width(),
                Layout.Alignment.ALIGN_CENTER, 1, 1, false);

        canvas.save();
        Rect r = new Rect();
        float y = (rect.height() / 2f) + (r.height() / 2f) - r.bottom - (sl.getHeight() /2);
        canvas.translate(rect.left, rect.top + y);
        sl.draw(canvas);
        canvas.restore();

        clickRegion = rect;
        this.pos = pos;
    }

user_9585748 · Answer

If you want button(s) on left side as well when swipe in the other direction, just try to add this simple lines in the existing answer:

In the drawButtons method:

private void drawButtons(Canvas c, View itemView, List buffer, int pos, float dX) {
    float right = itemView.getRight();
    float left = itemView.getLeft();
    float dButtonWidth = (-1) * dX / buffer.size();

    for (UnderlayButton button : buffer) {
        if (dX < 0) {
            left = right - dButtonWidth;
            button.onDraw(
                    c,
                    new RectF(
                            left,
                            itemView.getTop(),
                            right,
                            itemView.getBottom()
                    ),
                    pos, dX //(to draw button on right)
            );

            right = left;
        } else if (dX > 0) {
            right = left - dButtonWidth;
            button.onDraw(c,
                    new RectF(
                            right,
                            itemView.getTop(),
                            left,
                            itemView.getBottom()
                    ), pos, dX //(to draw button on left)
            );


        }
    }
}

In the onDraw method check the value of dX and set the text and the colour of the buttons:

public void onDraw(Canvas c, RectF rect, int pos, float dX) {
        Paint p = new Paint();

        // Draw background

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {


            if (dX > 0)
                p.setColor(Color.parseColor("#23d2c5"));
            else if (dX < 0)
                p.setColor(Color.parseColor("#23d2c5"));

            c.drawRect(rect, p);


            // Draw Text
            p.setColor(Color.WHITE);
            p.setTextSize(36);
            //  p.setTextSize(LayoutHelper.getPx(MyApplication.getAppContext(), 12));

            Rect r = new Rect();
            float cHeight = rect.height();
            float cWidth = rect.width();
            p.setTextAlign(Paint.Align.LEFT);
            p.getTextBounds(text, 0, text.length(), r);

            float x = cWidth / 2f - r.width() / 2f - r.left;
            float y = cHeight / 2f + r.height() / 2f - r.bottom;
            if (dX > 0) {
                p.setColor(Color.parseColor("#23d2c5"));
                c.drawText("Reject", rect.left + x, rect.top + y, p);
            } else if (dX < 0) {

                c.drawText(text, rect.left + x, rect.top + y, p);
            }
            clickRegion = rect;
            this.pos = pos;
        }

    }

user_12018393 · Answer

I am late to the party but if anyone looks for an UIKit UITableView delete button behaviour then you can use something like this with a RecyclerView in Xamarin.Android:

public class SwipeDeleteHelper : ItemTouchHelper.Callback
{
    private int _startingWidth = 0;
    private bool? _rightAlignedText = null;
    private bool _alreadyClicked = false;

    private static float _previousDx = float.NegativeInfinity;
    private static float _viewWidth = float.NegativeInfinity;
    private static float _permanentlyDeleteThreshold = float.NegativeInfinity;

    private static RecyclerView.ViewHolder _currentViewHolder;
    private RecyclerView.ViewHolder CurrentViewHolder
    {
        get => _currentViewHolder;

        set
        {
            _startingWidth = 0;
            _rightAlignedText = null;
            _alreadyClicked = false;

            _previousDx = float.NegativeInfinity;

            _currentViewHolder = value;
        }
    }
    /*
    You can create a method in a utility class for the buttonwidth conversion like this:
    public static float GetPxFromDp(float dp)
    {
        return dp * Application.Context.ApplicationContext.Resources.DisplayMetrics.Density;
    }
    Also you can use text width measurement to determine the optimal width of the button for your delete text.
    */
    public static int buttonWidth = 60 * Application.Context.ApplicationContext.Resources.DisplayMetrics.Density;

    public override int GetMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)
    {
        if (viewHolder is EntryCell)
        {
            return MakeMovementFlags(ItemTouchHelper.ActionStateIdle, ItemTouchHelper.Left | ItemTouchHelper.Start | ItemTouchHelper.Right | ItemTouchHelper.End);
        }

        return MakeMovementFlags(ItemTouchHelper.ActionStateIdle, ItemTouchHelper.ActionStateIdle);
    }

    public override void OnSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState)
    {
        if (float.IsNegativeInfinity(_permanentlyDeleteThreshold))
        {
            _viewWidth = viewHolder.ItemView.Width;
            _permanentlyDeleteThreshold = (viewHolder.ItemView.Width * 3f / 4f);
        }

        if (viewHolder != CurrentViewHolder)
        {
            if (viewHolder != null) // This is a new selection and the button of the previous viewHolder should get hidden.
            {
                (CurrentViewHolder as EntryCell)?.ResetView(CurrentViewHolder);

                CurrentViewHolder = viewHolder;
            }
            else if (CurrentViewHolder != null) // This is the end of the previous selection
            {
                var hidden = CurrentViewHolder.ItemView.FindViewById

The EntryCell is a descendant of MvxRecyclerViewHolder and it should contain something like this:

public class EntryCell : MvxRecyclerViewHolder
{
    public EntryCell(View itemView, IMvxAndroidBindingContext context) : base(itemView, context)
    {
        Button _delButton = itemView.FindViewById

Your view should have a button (Referenced in EntryCell as Resource.Id.fileListDeleteButton so the ID of the button is fileListDeleteButton) in it. I use an XML as a view and it looks like this:

In your code, where the RecyclerView is, use it like this:

ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new SwipeDeleteHelper());
itemTouchHelper.AttachToRecyclerView(yourRecyclerView);

I hope this helps someone.

user_1792386 · Answer

Since I haven't seen anywhere how to implement this and I did manage to get this to work, I will post a solution to this problem that is working however it is in c# Xamarin Android.

If you need it native android you will have to convert it android native which shouldn't be really hard. I might do this at a later date if very requested.

This is my ItemHelper base class:

 internal abstract class ItemTouchHelperBase : ItemTouchHelper.Callback
    {
        protected RecyclerViewAdapterBase adapter;
        public int currentPosition = -1;
        public Rect ItemRect = new Rect();

        private Paint backgroundPaint = new Paint();
        private Rect backgroundBounds = new Rect();
        private TextPaint textPaint = new TextPaint();
        private string deleteText;
        private readonly float textWidth;
        private readonly float textHeight;

        public ItemTouchHelperBase()
        {
            backgroundPaint.Color = new Color(ContextCompat.GetColor(Application.Context, Resource.Color.delete_red));
            textPaint.Color = Color.White;
            textPaint.AntiAlias = true;
            textPaint.TextSize = FontHelper.GetFontSize(Application.Context, Resource.Dimension.font_size_button);
            deleteText = "  " + StringResource.delete + "  ";

            Rect textBounds = new Rect();
            textPaint.GetTextBounds(deleteText, 0, deleteText.Length, textBounds);

            textHeight = textBounds.Height();
            textWidth = textPaint.MeasureText(deleteText);
        }

        public override bool OnMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target)
        {
            return false;
        }

        public override void ClearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)
        {
            if (adapter != null)
            {
                ItemRect = new Rect();
            }
            base.ClearView(recyclerView, viewHolder);
        }

        public override void OnSwiped(RecyclerView.ViewHolder viewHolder, int direction)
        {
        }

        public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
        {
            // Note: Don't create variables inside OnDraw due to performance issues
            try
            {
                if (actionState == ItemTouchHelper.ActionStateSwipe)
                {
                    if (dX <= 0) // Left swipe
                    {
                        // Swipe up to text width accordingly to ratio
                        dX /= viewHolder.ItemView.Right / textWidth;

                        //Draw background
                        backgroundBounds = new Rect(
                            viewHolder.ItemView.Right + (int) dX,
                            viewHolder.ItemView.Top,
                            viewHolder.ItemView.Right,
                            viewHolder.ItemView.Bottom);
                        c.DrawRect(backgroundBounds, backgroundPaint);

                        if (adapter != null)
                        {
                            ItemRect = backgroundBounds;
                        }

                        //Draw text
                        c.DrawText(
                            deleteText,
                            (float) viewHolder.ItemView.Right - textWidth, viewHolder.ItemView.Top + (viewHolder.ItemView.Height / 2) + (textHeight / 2),
                            textPaint);
                    }

                    base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
                }
            }
            catch (Exception)
            {
            }
        }

        internal void AttachToRecyclerview(RecyclerView recycleview)
        {
            new ItemTouchHelper(this).AttachToRecyclerView(recycleview);
        }

        public void ClickOutsideDeleteButton()
        {
            try
            {
                if (currentPosition != -1)
                {
                    PutRowBackToDefault();
                }
            }
            catch (Exception)
            {
            }
        }

        protected void PutRowBackToDefault()
        {
            adapter.NotifyItemChanged(currentPosition);
            currentPosition = -1;
        }
    }

Then on your item helper class you have:

 internal class MyItemsTouchHelperCallback : ItemTouchHelperBase
    {
        public MyItemsTouchHelperCallback (MyAdapter adapter)
        {
            this.adapter = adapter;
        }

        public override int GetMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder)
        {
            try
            {
                if (currentPosition != -1 && currentPosition != viewHolder.AdapterPosition)
                {
                    PutRowBackToDefault();
                }
                currentPosition = viewHolder.AdapterPosition;
            }
            catch (Exception)
            {
            }

            int swipeFlags = viewHolder is MyViewHolder ? ItemTouchHelper.Start : ItemTouchHelper.ActionStateIdle;
            return MakeMovementFlags(ItemTouchHelper.ActionStateIdle, swipeFlags);
        }
    }

Then on your activity you have:

Put this OnCreate

        recycleViewLayoutManager = new LinearLayoutManager(this);
        recycler_view_main.SetLayoutManager(recycleViewLayoutManager);
        recyclerAdapter = new MyAdapter(this, this);
        recycler_view_main.SetAdapter(recyclerAdapter);
        myItemsTouchHelperCallback = new MyItemsTouchHelperCallback (recyclerAdapter);
        myItemsTouchHelperCallback .AttachToRecyclerview(recycler_view_main);

Then on activity you override this method:

 public override bool DispatchTouchEvent(MotionEvent e)
            {
                int[] recyclerviewLocationOnScreen = new int[2];
                recycler_view_main.GetLocationOnScreen(recyclerviewLocationOnScreen);

                TouchEventsHelper.TouchUpEvent(
                    e.Action,
                    e.GetX() - recyclerviewLocationOnScreen[0],
                    e.GetY() - recyclerviewLocationOnScreen[1],
                    myItemsTouchHelperCallback .ItemRect,
                    delegate
                    {
                        // Delete your row
                    },
                    delegate
                    { myItemsTouchHelperCallback .ClickOutsideDeleteButton(); });


                return base.DispatchTouchEvent(e);
            }

This is the helper method i created to be used by the dispatch event:

internal static void TouchUpEvent(MotionEventActions eventActions, float x, float y, Rect rectangle, Action ActionDeleteClick, Action NormalClick)
        {
            try
            {
                if (rectangle.Contains((int) x, (int) y))
                {
                    //inside delete button
                    if (eventActions == MotionEventActions.Down)
                    {
                        isClick = true;
                    }
                    else if (eventActions == MotionEventActions.Up || eventActions == MotionEventActions.Cancel)
                    {
                        if (isClick)
                        {
                            ActionDeleteClick.Invoke();
                        }
                    }
                }
                else if (eventActions == MotionEventActions.Up ||
                         eventActions == MotionEventActions.Cancel ||
                         eventActions == MotionEventActions.Down)
                {
                    //click anywhere outside delete button
                    isClick = false;
                    if (eventActions == MotionEventActions.Down)
                    {
                        NormalClick.Invoke();
                    }
                }
            }
            catch (Exception)
            {
            }
        }

It is a bit complex but it works well. I have tested this in many ways. Let me know if you have any trouble implementing this

user_396483 · Answer

I have a much simpler solution:

Add a button to your row XML, width 0, floating on the right:

in onChildDraw(), just increase its width by the dX value.

 int position = viewHolder.getAdapterPosition();
 View v = recyclerView.getLayoutManager().findViewByPosition(position);
 Button hidden = v.findViewById(R.id.hidden);
 hidden.setLayoutParams(new LinearLayout.LayoutParams((int)-dX, -1));

Make sure not to call the default super.onChildDraw()

RecyclerView ItemTouchHelper Buttons on Swipe

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