Android application swipe left to right and right to left delete recyclerview and undo view examples here.

The RecyclerView is a more advanced and more flexible version of the ListView. This new component is a big step because the ListView is one of the most used UI widgets. The CardView widget, on the other hand, is a new component that does not “upgrade” an existing component.

Creating New Project

• Create a new project in Android Studio from File ⇒ New Project. When selecting Empty Activity and proceed.
• After create a project add dependencies in build.gradle(Module:app) like that.

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:recyclerview-v7:28.+'
    implementation 'com.android.support:cardview-v7:28.+'
    implementation 'com.android.support:design:28.+'
}

• After Open  activity_main.xml  under res ⇒ layouts and add this code.

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linear"
    android:background="#e4e0e0"
    tools:context=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="10dp"/>

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

• After then create item layout under res ⇒ layouts and add this code.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="5dp"
    android:paddingLeft="5dp"
    android:paddingRight="5dp"
    tools:context=".MainActivity"
    tools:ignore="NamespaceTypo">

    <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:layout_gravity="center"
        app:cardBackgroundColor="#ffffff"
        android:layout_marginTop="0dp"
        card_view:cardCornerRadius="1dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:id="@+id/tv"
                android:height="90dp"
                android:gravity="center"
                android:paddingLeft="10dp"
                android:text="Code"
                android:textColor="#000"
                android:textStyle="bold"
                android:textSize="18sp" />

        </LinearLayout>

    </android.support.v7.widget.CardView>
</RelativeLayout>

• Create a java (model) class file under java ⇒ package name Model

package com.wapptech.swipe;

public class Model {
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

• After then Create a adapter (Adapter) file under java ⇒ package name Model

package com.wapptech.swipe;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> {
    private LayoutInflater inflater;
    private ArrayList<Model> imageModelArrayList;
    public Adapter(Context ctx, ArrayList<Model> imageModelArrayList){
        inflater = LayoutInflater.from(ctx);
        this.imageModelArrayList = imageModelArrayList;
    }
    public void removeItem(int position) {
        imageModelArrayList.remove(position);
        notifyItemRemoved(position);
        notifyItemRangeChanged(position, imageModelArrayList.size());
    }
    public void restoreItem(Model model, int position) {
        imageModelArrayList.add(position, model);
        // notify item added by position
        notifyItemInserted(position);
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.rv_item, parent, false);
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }
    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.time.setText(imageModelArrayList.get(position).getName());
    }
    @Override
    public int getItemCount() {
        return imageModelArrayList.size();
    }
    class MyViewHolder extends RecyclerView.ViewHolder{
        TextView time;
        public MyViewHolder(View itemView) {
            super(itemView);
            time = (TextView) itemView.findViewById(R.id.tv);
        }
    }
}

• After Open MainActivity.java and modify the code as below. 

package com.wapptech.swipe;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.View;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ArrayList<Model> imageModelArrayList;
    private Adapter adapter;
    private Paint p = new Paint();
    private String[] myImageNameList = new String[]{"Code1", "Code2",
            "Code3","Code4"
            ,"Code5","Code6",
            "Code7","Code8",
            "Code9","Code10"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.recycler);
        imageModelArrayList = populateList();
        adapter = new Adapter(this,imageModelArrayList);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));

        enableSwipe();
    }

    private void enableSwipe(){
        ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {

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

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                int position = viewHolder.getAdapterPosition();
                if (direction == ItemTouchHelper.LEFT){
                    final Model deletedModel = imageModelArrayList.get(position);
                    final int deletedPosition = position;
                    adapter.removeItem(position);
                    // showing snack bar with Undo option
                    Snackbar snackbar = Snackbar.make(getWindow().getDecorView().getRootView(), " removed from Recyclerview!", Snackbar.LENGTH_LONG);
                    snackbar.setAction("UNDO", new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            // undo is selected, restore the deleted item
                            adapter.restoreItem(deletedModel, deletedPosition);
                        }
                    });
                    snackbar.setActionTextColor(Color.YELLOW);
                    snackbar.show();
                } else {
                    final Model deletedModel = imageModelArrayList.get(position);
                    final int deletedPosition = position;
                    adapter.removeItem(position);
                    // showing snack bar with Undo option
                    Snackbar snackbar = Snackbar.make(getWindow().getDecorView().getRootView(), " removed from Recyclerview!", Snackbar.LENGTH_LONG);
                    snackbar.setAction("UNDO", new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            // undo is selected, restore the deleted item
                            adapter.restoreItem(deletedModel, deletedPosition);
                        }
                    });
                    snackbar.setActionTextColor(Color.YELLOW);
                    snackbar.show();
                }
            }
            @Override
            public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
                Bitmap icon;
                if(actionState == ItemTouchHelper.ACTION_STATE_SWIPE){
                    View itemView = viewHolder.itemView;
                    float height = (float) itemView.getBottom() - (float) itemView.getTop();
                    float width = height / 3;
                    if(dX > 0){
                        p.setColor(Color.parseColor("#388E3C"));
                        RectF background = new RectF((float) itemView.getLeft(), (float) itemView.getTop(), dX,(float) itemView.getBottom());
                        c.drawRect(background,p);
                        icon = BitmapFactory.decodeResource(getResources(), R.drawable.delete);
                        RectF icon_dest = new RectF((float) itemView.getLeft() + width ,(float) itemView.getTop() + width,(float) itemView.getLeft()+ 2*width,(float)itemView.getBottom() - width);
                        c.drawBitmap(icon,null,icon_dest,p);
                    } else {
                        p.setColor(Color.parseColor("#D32F2F"));
                        RectF background = new RectF((float) itemView.getRight() + dX, (float) itemView.getTop(),(float) itemView.getRight(), (float) itemView.getBottom());
                        c.drawRect(background,p);
                        icon = BitmapFactory.decodeResource(getResources(), R.drawable.delete);
                        RectF icon_dest = new RectF((float) itemView.getRight() - 2*width ,(float) itemView.getTop() + width,(float) itemView.getRight() - width,(float)itemView.getBottom() - width);
                        c.drawBitmap(icon,null,icon_dest,p);
                    }
                }
                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            }
        };
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
        itemTouchHelper.attachToRecyclerView(recyclerView);
    }
    private ArrayList<Model> populateList(){
        ArrayList<Model> list = new ArrayList<>();
        for(int i = 0; i < 8; i++){
            Model imageModel = new Model();
            imageModel.setName(myImageNameList[i]);
            list.add(imageModel);
        }
        return list;
    }
}

Done Swipe left to right and right to left delete recyclerview and undo view.

Github: https://github.com/Sudarshan101/AndroidSwipeleftright.git

Youtube: https://www.youtube.com/watch?v=jLPB8R9W_pU

Thankyou