Swipe To Delete and Undo Feature in Android RecyclerView

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Hello Friends, Today I am going to share how to add swipe to delete and undo feature in Android RecyclerView. Recently I was working on an app in which I was required to add same swipe to delete feature. So, I googled and found the solution and modified it according to the app. But here I am sharing copy of the code available at https://www.journaldev.com/23164/android-recyclerview-swipe-to-delete-undo with very minor modifications. But for the solution of the problem(swipe to delete), all the credit goes to Anupam Chugh @ journaldev.com

Now, here is my code

MainActivity.java

package com.zatackcoder.swipetodeleteandundo;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;

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

import com.google.android.material.snackbar.Snackbar;

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

public class MainActivity extends AppCompatActivity {

RecyclerView itemsContainerRV;
    RecyclerViewAdapter itemAdapter;

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

List<String> data = new ArrayList();
        for(int i = 1; i <= 20; i++) {
            data.add("Item " + i);
        }

itemsContainerRV = findViewById(R.id.itemsContainerRV);
        itemAdapter = new RecyclerViewAdapter(this, data);
        itemAdapter.notifyDataSetChanged();
        itemsContainerRV.setAdapter(itemAdapter);

ItemTouchHelper itemTouchhelper = new ItemTouchHelper(new SwipeToDeleteCallback(this) {
            @Override
            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int i) {

final int position = viewHolder.getAdapterPosition();
                final String item = itemAdapter.getData().get(position);

itemAdapter.removeItem(position);

Snackbar snackbar = Snackbar.make(itemsContainerRV, "Item was removed from the list.", Snackbar.LENGTH_LONG);
                snackbar.setAction("UNDO", new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        itemAdapter.restoreItem(item, position);
                        itemsContainerRV.scrollToPosition(position);
                    }
                });

snackbar.setActionTextColor(Color.YELLOW);
                snackbar.show();
            }
        });
        itemTouchhelper.attachToRecyclerView(itemsContainerRV);
    }
}

package com.zatackcoder.swipetodeleteandundo;

import android.graphics.Color;

import android.os.Bundle;

import android.view.View;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.ItemTouchHelper;

import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.snackbar.Snackbar;

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity {

RecyclerView itemsContainerRV;

RecyclerViewAdapter itemAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

List<String> data = new ArrayList();

for(int i = 1; i <= 20; i++) {

data.add("Item " + i);

}

itemsContainerRV = findViewById(R.id.itemsContainerRV);

itemAdapter = new RecyclerViewAdapter(this, data);

itemAdapter.notifyDataSetChanged();

itemsContainerRV.setAdapter(itemAdapter);

ItemTouchHelper itemTouchhelper = new ItemTouchHelper(new SwipeToDeleteCallback(this) {

@Override

public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int i) {

final int position = viewHolder.getAdapterPosition();

final String item = itemAdapter.getData().get(position);

itemAdapter.removeItem(position);

Snackbar snackbar = Snackbar.make(itemsContainerRV, "Item was removed from the list.", Snackbar.LENGTH_LONG);

snackbar.setAction("UNDO", new View.OnClickListener() {

@Override

public void onClick(View view) {

itemAdapter.restoreItem(item, position);

itemsContainerRV.scrollToPosition(position);

}

});

snackbar.setActionTextColor(Color.YELLOW);

snackbar.show();

}

});

itemTouchhelper.attachToRecyclerView(itemsContainerRV);

}

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"

android:background="@color/cardview_dark_background">

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/itemsContainerRV"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"/>

</androidx.constraintlayout.widget.ConstraintLayout>

RecyclerViewAdapter.java

package com.zatackcoder.swipetodeleteandundo;

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.List;

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

Context context;
    List<String> data;

public RecyclerViewAdapter(Context context, List<String> data) {
        this.context = context;
        this.data = data;
    }

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

@Override
    public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
        holder.itemNameTV.setText(data.get(position));
        holder.itemNameTV.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String item = data.get(position);
                Toast.makeText(context, "You clicked " + item, Toast.LENGTH_LONG).show();
            }
        });
    }

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

public void removeItem(int position) {
        data.remove(position);
        notifyItemRemoved(position);
    }

public void restoreItem(String item, int position) {
        data.add(position, item);
        notifyItemInserted(position);
    }

public List<String> getData() {
        return data;
    }

static class ViewHolder extends RecyclerView.ViewHolder {

View container;
        TextView itemNameTV;

public ViewHolder(View view) {
            super(view);
            container = view;
            itemNameTV = view.findViewById(R.id.itemNameTV);
        }

}
}

package com.zatackcoder.swipetodeleteandundo;

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.List;

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

Context context;

List<String> data;

public RecyclerViewAdapter(Context context, List<String> data) {

this.context = context;

this.data = data;

}

@NonNull

@Override

public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

View v = LayoutInflater.from(context).inflate(R.layout.item, parent, false);

return new ViewHolder(v);

}

@Override

public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {

holder.itemNameTV.setText(data.get(position));

holder.itemNameTV.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

String item = data.get(position);

Toast.makeText(context, "You clicked " + item, Toast.LENGTH_LONG).show();

}

});

}

@Override

public int getItemCount() {

return data.size();

}

public void removeItem(int position) {

data.remove(position);

notifyItemRemoved(position);

}

public void restoreItem(String item, int position) {

data.add(position, item);

notifyItemInserted(position);

}

public List<String> getData() {

return data;

}

static class ViewHolder extends RecyclerView.ViewHolder {

View container;

TextView itemNameTV;

public ViewHolder(View view) {

super(view);

container = view;

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

}

SwipeToDeleteCallback.java

package com.zatackcoder.swipetodeleteandundo;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import androidx.annotation.NonNull;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.ItemTouchHelper;
import android.view.View;

public abstract class SwipeToDeleteCallback extends ItemTouchHelper.Callback {
    Context mContext;
    private Paint mClearPaint;
    private ColorDrawable mBackground;
    private int backgroundColor;
    private Drawable deleteDrawable;
    private int intrinsicWidth;
    private int intrinsicHeight;

public SwipeToDeleteCallback(Context context) {
        mContext = context;
        mBackground = new ColorDrawable();
        backgroundColor = Color.parseColor("#b80f0a");
        mClearPaint = new Paint();
        mClearPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
        deleteDrawable = ContextCompat.getDrawable(mContext, android.R.drawable.ic_menu_delete);
        intrinsicWidth = deleteDrawable.getIntrinsicWidth();
        intrinsicHeight = deleteDrawable.getIntrinsicHeight();

}

@Override
    public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
        return makeMovementFlags(0, ItemTouchHelper.LEFT);
    }

@Override
    public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder viewHolder1) {
        return false;
    }

@Override
    public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

View itemView = viewHolder.itemView;
        int itemHeight = itemView.getHeight();

boolean isCancelled = dX == 0 && !isCurrentlyActive;

if (isCancelled) {
            clearCanvas(c, itemView.getRight() + dX, (float) itemView.getTop(), (float) itemView.getRight(), (float) itemView.getBottom());
            super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            return;
        }

mBackground.setColor(backgroundColor);
        mBackground.setBounds(itemView.getRight() + (int) dX, itemView.getTop(), itemView.getRight(), itemView.getBottom());
        mBackground.draw(c);

int deleteIconTop = itemView.getTop() + (itemHeight - intrinsicHeight) / 2;
        int deleteIconMargin = (itemHeight - intrinsicHeight) / 2;
        int deleteIconLeft = itemView.getRight() - deleteIconMargin - intrinsicWidth;
        int deleteIconRight = itemView.getRight() - deleteIconMargin;
        int deleteIconBottom = deleteIconTop + intrinsicHeight;

deleteDrawable.setBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom);
        deleteDrawable.draw(c);

super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

}

private void clearCanvas(Canvas c, Float left, Float top, Float right, Float bottom) {
        c.drawRect(left, top, right, bottom, mClearPaint);

}

@Override
    public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {
        return 0.8f;
    }
}

package com.zatackcoder.swipetodeleteandundo;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.PorterDuff;

import android.graphics.PorterDuffXfermode;

import android.graphics.drawable.ColorDrawable;

import android.graphics.drawable.Drawable;

import androidx.annotation.NonNull;

import androidx.core.content.ContextCompat;

import androidx.recyclerview.widget.RecyclerView;

import androidx.recyclerview.widget.ItemTouchHelper;

import android.view.View;

public abstract class SwipeToDeleteCallback extends ItemTouchHelper.Callback {

Context mContext;

private Paint mClearPaint;

private ColorDrawable mBackground;

private int backgroundColor;

private Drawable deleteDrawable;

private int intrinsicWidth;

private int intrinsicHeight;

public SwipeToDeleteCallback(Context context) {

mContext = context;

mBackground = new ColorDrawable();

backgroundColor = Color.parseColor("#b80f0a");

mClearPaint = new Paint();

mClearPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

deleteDrawable = ContextCompat.getDrawable(mContext, android.R.drawable.ic_menu_delete);

intrinsicWidth = deleteDrawable.getIntrinsicWidth();

intrinsicHeight = deleteDrawable.getIntrinsicHeight();

}

@Override

public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {

return makeMovementFlags(0, ItemTouchHelper.LEFT);

}

@Override

public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder viewHolder1) {

return false;

}

@Override

public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {

super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

View itemView = viewHolder.itemView;

int itemHeight = itemView.getHeight();

boolean isCancelled = dX == 0 && !isCurrentlyActive;

if (isCancelled) {

clearCanvas(c, itemView.getRight() + dX, (float) itemView.getTop(), (float) itemView.getRight(), (float) itemView.getBottom());

super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

return;

}

mBackground.setColor(backgroundColor);

mBackground.setBounds(itemView.getRight() + (int) dX, itemView.getTop(), itemView.getRight(), itemView.getBottom());

mBackground.draw(c);

int deleteIconTop = itemView.getTop() + (itemHeight - intrinsicHeight) / 2;

int deleteIconMargin = (itemHeight - intrinsicHeight) / 2;

int deleteIconLeft = itemView.getRight() - deleteIconMargin - intrinsicWidth;

int deleteIconRight = itemView.getRight() - deleteIconMargin;

int deleteIconBottom = deleteIconTop + intrinsicHeight;

deleteDrawable.setBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom);

deleteDrawable.draw(c);

super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

}

private void clearCanvas(Canvas c, Float left, Float top, Float right, Float bottom) {

c.drawRect(left, top, right, bottom, mClearPaint);

}

@Override

public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {

return 0.8f;

}

item.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:padding="8dp"

android:layout_marginTop="4dp"

android:layout_marginLeft="2dp"

android:layout_marginRight="2dp"

android:background="#FFFFFF">

<TextView

android:id="@+id/itemNameTV"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:textSize="20sp"

android:textStyle="bold"

android:textColor="#000000"

android:text="Item"/>

</LinearLayout >

Video

AndroidStudio Project Download

RecyclerView Swipe To Delete and Undo in Android

1 file(s) 13.15 MB

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Thanks for Stoping by
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Swipe To Delete and Undo Feature in Android RecyclerView

MainActivity.java

activity_main.xml

RecyclerViewAdapter.java

SwipeToDeleteCallback.java

item.xml

Video

AndroidStudio Project Download

RecyclerView Swipe To Delete and Undo in Android

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