Swipe to Delete RecyclerView items with UNDU

In this tutorial, we will create the example to delete an item of RecyclerView by swiping the item with undo functionality. For this purpose, we will use ItemTouchHelper class which is added in Android Support Library V7. This class is used to create a swipe to delete the items of RecyclerView. It has a SimpleCallback class that configures the events which are performed to swipe or move the item of the RecyclerView.

ItemTouchHelper class
It is a utility class which provides the facility to add swipe to dismiss and drag & drops the items of RecyclerView. It overrides the callback methods onMove() or onSwipe() depending upon the functionality we implement.

Android Swipe to Delete RecyclerView items Example
Create a MainActivity.java class with the following code.

activity_main.xml

ass with the following code.
activity_main.xml
<?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:fitsSystemWindows="true"
tools:context="example.javatpoint.com.recyclerviewswipedeleteundo.MainActivity">

<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />

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

<include layout="@layout/content_main" />

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

content_main.xml

MainActivity.java

package example.javatpoint.com.recyclerviewswipedeleteundo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

}
}

Create a layout regular_item.xml which appears at normal mode.

regular_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/regularLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="@dimen/activity_horizontal_margin">

<TextView
android:id="@+id/list_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Regular Layout"
android:textSize="28sp" />
</LinearLayout>

Create a layout swipe_item.xml which appears at the period of swipe item.

swipe_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipeLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/swipebackground"
android:orientation="horizontal"
android:padding="@dimen/activity_horizontal_margin"
android:visibility="visible"
android:weightSum="3">

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/archived_label"
android:textColor="@android:color/white"
android:textSize="24sp" />


<TextView
android:id="@+id/undo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="end"
android:paddingBottom="5dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="5dp"
android:text="@string/undo_label"
android:textColor="@android:color/white"
android:textSize="22sp"
android:textStyle="bold" />

</LinearLayout>

customlayout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<include layout="@layout/swipe_item" />

<include layout="@layout/regular_item" />
</FrameLayout>

Create a utility class SwipeUtil.java which extends the ItemTouchHelper.SimpleCallback class and overrides its onMove(), onSwiped(), onChildDraw() methods. The onSwiped() method is called when we perform swipe operation on an item, and the onChildDraw() methods contain the implementation logic of drawing canvas while swiping the items of RecyclerView.

SwipeUtil.java

Create an ItemViewHolder.java class and extends RecyclerView.ViewHolder.

ItemViewHolder.java

package example.javatpoint.com.recyclerviewswipedeleteundo;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ItemViewHolder extends RecyclerView.ViewHolder {

public LinearLayout regularLayout;
public LinearLayout swipeLayout;
public TextView listItem;
public TextView undo;

public ItemViewHolder(View view) {
super(view);

regularLayout = view.findViewById(R.id.regularLayout);
listItem = view.findViewById(R.id.list_item);
swipeLayout = view.findViewById(R.id.swipeLayout);
undo = view.findViewById(R.id.undo);
}
}

Create an adapter class MyAdapter.java which extends the RecyclerView.Adapter class and overrides its onCreateViewHolder(), onBindViewHolder() methods.

MyAdapter.java

package example.javatpoint.com.recyclerviewswipedeleteundo;

import android.os.Handler;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class MyAdapter extends RecyclerView.Adapter<ItemViewHolder> {

private List<String> dataList;
private List<String> itemsPendingRemoval;

private static final int PENDING_REMOVAL_TIMEOUT = 3000; // 3sec
private Handler handler = new Handler(); // hanlder for running delayed runnables
HashMap<String, Runnable> pendingRunnables = new HashMap<>(); // map of items to pending runnable, to cancel the removal


public MyAdapter(List<String> dataList) {
this.dataList = dataList;
itemsPendingRemoval = new ArrayList<>();
}

@Override
public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.customlayout, parent, false);
return new ItemViewHolder(itemView);
}

@Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int position) {

final String data = dataList.get(position);

if (itemsPendingRemoval.contains(data)) {
/** show swipe layout and hide regular layout */
itemViewHolder.regularLayout.setVisibility(View.GONE);
itemViewHolder.swipeLayout.setVisibility(View.VISIBLE);
itemViewHolder.undo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
undoOpt(data);
}
});
} else {
/** show regular layout and hide swipe layout*/
itemViewHolder.regularLayout.setVisibility(View.VISIBLE);
itemViewHolder.swipeLayout.setVisibility(View.GONE);
itemViewHolder.listItem.setText(data);
}
}

private void undoOpt(String customer) {
Runnable pendingRemovalRunnable = pendingRunnables.get(customer);
pendingRunnables.remove(customer);
if (pendingRemovalRunnable != null)
handler.removeCallbacks(pendingRemovalRunnable);
itemsPendingRemoval.remove(customer);
// this will rebind the row in "normal" state
notifyItemChanged(dataList.indexOf(customer));
}

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

public void pendingRemoval(int position) {

final String data = dataList.get(position);
if (!itemsPendingRemoval.contains(data)) {
itemsPendingRemoval.add(data);
// this will redraw row in "undo" state
notifyItemChanged(position);
//create, store and post a runnable to remove the data
Runnable pendingRemovalRunnable = new Runnable() {
@Override
public void run() {
remove(dataList.indexOf(data));
}
};
handler.postDelayed(pendingRemovalRunnable, PENDING_REMOVAL_TIMEOUT);
pendingRunnables.put(data, pendingRemovalRunnable);
}
}

public void remove(int position) {
String data = dataList.get(position);
if (itemsPendingRemoval.contains(data)) {
itemsPendingRemoval.remove(data);
}
if (dataList.contains(data)) {
dataList.remove(position);
notifyItemRemoved(position);
}
}

public boolean isPendingRemoval(int position) {
String data = dataList.get(position);
return itemsPendingRemoval.contains(data);
}
}

Create a MainActivityFragment.java class and extends the Fragment class. In this class, set the adapter MyAdapter.java class and utility SwipeUtil.java class.

fragment_main.xml

MainActivityFragment.java

package example.javatpoint.com.recyclerviewswipedeleteundo;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;

public class MainActivityFragment extends Fragment {

private RecyclerView mRecyclerView;
private MyAdapter myAdapter;
String[] listValue = {"C Tutorial","C++ Tutorial","Data Structure","Java Tutorial","Android Example","Kotlin Programing","Python language","Ruby Tutorial",".Net Tutorial","MySQL Database"};
public MainActivityFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View mView = inflater.inflate(R.layout.fragment_main, container, false);
mRecyclerView = mView.findViewById(R.id.recyclerView);
return mView;
}

@Override
public void onResume() {
super.onResume();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(linearLayoutManager);
myAdapter = new MyAdapter(getData());
mRecyclerView.setAdapter(myAdapter);

setSwipeForRecyclerView();
}

private List<String> getData() {
List<String> modelList = new ArrayList<>();
for (int i = 0; i < listValue.length; i++) {
modelList.add(listValue[i]);
}
return modelList;
}

private void setSwipeForRecyclerView() {

SwipeUtil swipeHelper = new SwipeUtil(0, ItemTouchHelper.LEFT, getActivity()) {
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int swipedPosition = viewHolder.getAdapterPosition();
myAdapter = (MyAdapter)mRecyclerView.getAdapter();
myAdapter.pendingRemoval(swipedPosition);
}

@Override
public int getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int position = viewHolder.getAdapterPosition();
myAdapter = (MyAdapter) mRecyclerView.getAdapter();
if (myAdapter.isPendingRemoval(position)) {
return 0;
}
return super.getSwipeDirs(recyclerView, viewHolder);
}
};

ItemTouchHelper mItemTouchHelper = new ItemTouchHelper(swipeHelper);
mItemTouchHelper.attachToRecyclerView(mRecyclerView);
//set swipe label
swipeHelper.setLeftSwipeLable("Archive");
//set swipe background-Color
swipeHelper.setLeftcolorCode(ContextCompat.getColor(getActivity(), R.color.swipebackground));
}
}

strings.xml

<resources>
<string name="app_name">RecyclerView SwipeDeleteUndo</string>
<string name="action_settings">Settings</string>
<string name="hello_blank_fragment">Hello blank fragment</string>
<string name="undo_label"><u>Undo</u></string>
<string name="archived_label">Archive</string>
</resources>

dimens.xml

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="swipebackground">#cf0b4e</color>
</resources>

Output:

Android Swipe to Delete RecyclerView items with UNDU

Android Tutorial

Android Widgets

Activity and Intents

Android Fragments

Android Menu

Android Service

Android AlarmManager

Android Storage

Android SQLite

XML and JSON

Android Multimedia

Android Speech

Android Telephony

Android Device

Camera Tutorial

Sensor Tutorial

Android Graphics

Android Animation

Android Web Service

Google Map

Adding Ads

Android Examples

Android Social

Android Versions

Android Misc

Android MCQ

Android Interview

Android Quiz