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How to dynamically update a ListView on Android Kotlin?
This example demonstrates how to dynamically update a ListView on Android 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.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="4dp"> <EditText android:id="@+id/editText" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Enter an item here" android:inputType="text" /> <Button android:id="@+id/btnAdd" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/editText" android:text="Add item" /> <ListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/btnAdd" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.Button
import android.widget.EditText
import android.widget.ListView
class MainActivity : AppCompatActivity() {
lateinit var editText: EditText
lateinit var button: Button
lateinit var listView: ListView
var list: ArrayList<String> = ArrayList()
lateinit var arrayAdapter: ArrayAdapter<String>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "Kotlin"
listView = findViewById(R.id.listView)
editText = findViewById(R.id.editText)
button = findViewById(R.id.btnAdd)
arrayAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, list)
button.setOnClickListener {
list.add(editText.text.toString())
editText.setText("")
arrayAdapter.notifyDataSetChanged()
listView.adapter = arrayAdapter
}
}
}Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.kotlipapp"> <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 −
Click here to download the project code.
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