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How to create a listView with a checkBox in Kotlin?
This example demonstrates how to Create a listView with a checkBox in Kotlin.
Step 1 − Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
Example
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="4dp" tools:context=".MainActivity"> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="wrap_content" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
Example
import android.view.View
import android.widget.AdapterView.OnItemClickListener
import android.widget.ListView
import androidx.appcompat.app.AppCompatActivity
import java.util.*
class MainActivity : AppCompatActivity() {
private var dataModel: ArrayList<DataModel>? = null
private lateinit var listView: ListView
private lateinit var adapter: CustomAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
listView = findViewById<View>(R.id.listView) as ListView
dataModel = ArrayList<DataModel>()
dataModel!!.add(DataModel("Apple Pie", false))
dataModel!!.add(DataModel("Banana Bread", false))
dataModel!!.add(DataModel("Cupcake", false))
dataModel!!.add(DataModel("Donut", true))
dataModel!!.add(DataModel("Eclair", true))
dataModel!!.add(DataModel("Froyo", true))
dataModel!!.add(DataModel("Gingerbread", true))
dataModel!!.add(DataModel("Honeycomb", false))
dataModel!!.add(DataModel("Ice Cream Sandwich", false))
dataModel!!.add(DataModel("Jelly Bean", false))
dataModel!!.add(DataModel("Kitkat", false))
dataModel!!.add(DataModel("Lollipop", false))
dataModel!!.add(DataModel("Marshmallow", false))
dataModel!!.add(DataModel("Nougat", false))
adapter = CustomAdapter(dataModel!!, applicationContext)
listView.adapter = adapter
listView.onItemClickListener = OnItemClickListener { _, _, position, _ ->
val dataModel: DataModel = dataModel!![position] as DataModel
dataModel.checked = !dataModel.checked
adapter.notifyDataSetChanged()
}
}
}Step 4 − Create a new Kotlin class (CustomAdapter.kt) and add the following code to src/CustomAdapter.kt
Example
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.CheckBox
import android.widget.TextView
import java.util.*
class CustomAdapter(private val dataSet: ArrayList<*>, mContext: Context) :
ArrayAdapter<Any?>(mContext, R.layout.row_item, dataSet) {
private class ViewHolder {
lateinit var txtName: TextView
lateinit var checkBox: CheckBox
}
override fun getCount(): Int {
return dataSet.size
}
override fun getItem(position: Int): DataModel {
return dataSet[position] as DataModel
}
override fun getView(
position: Int,
convertView: View?,
parent: ViewGroup
): View {
var convertView = convertView
val viewHolder: ViewHolder
val result: View
if (convertView == null) {
viewHolder = ViewHolder()
convertView =
LayoutInflater.from(parent.context).inflate(R.layout.row_item, parent, false)
viewHolder.txtName =
convertView.findViewById(R.id.txtName)
viewHolder.checkBox =
convertView.findViewById(R.id.checkBox)
result = convertView
convertView.tag = viewHolder
} else {
viewHolder = convertView.tag as ViewHolder
result = convertView
}
val item: DataModel = getItem(position)
viewHolder.txtName.text = item.name
viewHolder.checkBox.isChecked = item.checked
return result
}
}Step 5 − Create a new Kotlin class (DataModel.kit) and add the following code to src/DataModel.kt
package app.com.q3 class DataModel internal constructor(var name: String?, var checked: Boolean)
Step 6 − Create a Layout resource file (row_item.xml) and add the following code −
Example
<?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="match_parent" android:padding="2dp"> <TextView android:id="@+id/txtName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentStart="true" android:layout_centerVertical="true" android:textColor="@android:color/background_dark" android:textSize="16sp" /> <CheckBox android:id="@+id/checkBox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignParentEnd="true" /> </RelativeLayout>
Step 7 − Add the following code to androidManifest.xml
Example
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.q1"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen
Updated on: 23-May-2020
993 Views
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