In this android kotlin source code example, we are going to add RecyclerView item Swipe to Dismiss in Kotlin.
You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.
Below is a step by step source code to add RecyclerView item Swipe to Dismiss in Kotlin.
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=".recyclerView.RecyclerViewActivity11"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"/> </androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.kt
import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import androidx.recyclerview.widget.RecyclerView import com.bluapp.kotlinview.R import androidx.recyclerview.widget.ItemTouchHelper import androidx.recyclerview.widget.DividerItemDecoration import androidx.recyclerview.widget.LinearLayoutManager import android.widget.TextView import android.view.LayoutInflater import android.view.ViewGroup import android.widget.Toast import android.content.Context import android.view.View class RecyclerViewActivity11 : AppCompatActivity() { private var list: RecyclerView? = null private var recyclerAdapter: adapter? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_recycler_view11) list = findViewById(R.id.list) as RecyclerView val country = arrayListOf<String>() country.add("Nigeria") country.add("China") country.add("USA") country.add("Ghana") country.add("Canada") country.add("Finland") country.add("Denmark") country.add("Argentina") country.add("Andorra") country.add("Togo") val layoutManager = LinearLayoutManager(this) list!!.setLayoutManager(layoutManager) recyclerAdapter = adapter(this@RecyclerViewActivity11, country) list!!.addItemDecoration(DividerItemDecoration(list!!.getContext(), layoutManager.orientation)) list!!.setAdapter(recyclerAdapter) val itemTouchHelper = ItemTouchHelper(simpleCallback) itemTouchHelper.attachToRecyclerView(list) } var simpleCallback: ItemTouchHelper.SimpleCallback = object : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT or ItemTouchHelper.DOWN or ItemTouchHelper.UP) { override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, viewHolder1: RecyclerView.ViewHolder): Boolean { Toast.makeText(this@RecyclerViewActivity11, "Move", Toast.LENGTH_SHORT).show() return false } override fun onSwiped(viewHolder: RecyclerView.ViewHolder, i: Int) { Toast.makeText(this@RecyclerViewActivity11, "Swipe To Delete", Toast.LENGTH_SHORT).show() val position = viewHolder.adapterPosition recyclerAdapter!!.deleteItem(position) } } private inner class adapter(internal var context: Context, internal var mData: MutableList<String>) : RecyclerView.Adapter<adapter.myViewHolder>() { override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): adapter.myViewHolder { val view = LayoutInflater.from(context).inflate(com.bluapp.kotlinview.R.layout.recyclerview_adapter1, parent, false) return myViewHolder(view) } fun deleteItem(position: Int) { mData.removeAt(position) notifyItemRemoved(position) } override fun onBindViewHolder(holder: adapter.myViewHolder, position: Int) { holder.country.text = mData[position] } override fun getItemCount(): Int { return mData.size } inner class myViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { internal var country: TextView init { country = itemView.findViewById(R.id.country) } } } }
recyclerview_adapter1.xml
<?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="wrap_content" android:padding="10dp"> <TextView android:id="@+id/country" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:text="Country" android:textColor="#000000" android:textSize="18sp" android:textStyle="bold" /> </RelativeLayout>
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