How to change the background color of ListView items on Android Kotlin?

This example demonstrates how to change the background color of ListView items 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.

Example

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:padding="6dp"
   tools:context=".MainActivity">
   <ListView
      android:id="@+id/listView"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.kt

Example

import android.graphics.Color
import android.os.Build
import android.os.Bundle
import android.widget.*
import android.widget.AdapterView.OnItemClickListener
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   var list = arrayOf(
      "Android", "IPhone", "WindowsMobile", "Blackberry",
      "WebOS", "Ubuntu", "Windows7", "Max OS X"
   )
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      Toast.makeText(
         applicationContext,
         "Touch to change the color of the list item",
         Toast.LENGTH_SHORT
      ).show()
      val listView: ListView = findViewById(R.id.listView)
      val adapter: Adapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, list)
      listView.adapter = adapter as ListAdapter?
      listView.onItemClickListener = OnItemClickListener {
         _, view, _, _ ->
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            view.setBackgroundColor(Color.CYAN)
         }
      }
   }
}

Step 4  − 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.myapplication">
   <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