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This example demonstrates how to handle swipe gestures in an android device using 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. Step 3 − Add the following code to src/MainActivity.ktpackage app.com.kotlinapp import android.os.Bundle import android.widget.RelativeLayout import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private lateinit var layout: RelativeLayout override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) layout = findViewById(R.id.relativeLayout) ... Read More
This example demonstrates how to track the current location (Latitude and Longitude) in an android device using 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. Step 3 − Add the following code to src/MainActivity.ktpackage app.com.kotlipapp import android.Manifest import android.content.Intent import android.content.pm.PackageManager import android.location.Location import android.net.Uri import android.os.Build import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.provider.Settings import android.util.Log import android.view.View import android.widget.TextView import android.widget.Toast import androidx.core.app.ActivityCompat import com.google.android.gms.location.FusedLocationProviderClient import com.google.android.gms.location.LocationServices class ... Read More
This example demonstrates how to create a notification alert using 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. Step 3 − Add the following code to src/MainActivity.ktpackage app.com.kotlinapp import android.app.* import android.content.Context import android.content.Intent import android.graphics.BitmapFactory import android.graphics.Color import android.os.Build import android.os.Bundle import android.view.View import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { lateinit var notificationChannel: NotificationChannel lateinit var notificationManager: NotificationManager lateinit var builder: Notification.Builder private val channelId = "12345" ... Read More
This example demonstrates how to create a multilevel listView using Kotlin Android.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. Step 3 − Add the following code to src/MainActivity.ktpackage app.com.kotlinapp import android.os.Bundle import androidx.appcompat.app.AppCompatActivity import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { private val header: MutableList = ArrayList() private val body: MutableList = ArrayList() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val myFavCricketPlayers: ... Read More
This example demonstrates how to listen for a webview finishing loading a URL in android.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. Step 3 − Add the following code to src/MainActivity.ktpackage app.com.kotlinapp import android.os.Bundle import android.view.View import android.webkit.WebChromeClient import android.webkit.WebView import android.webkit.WebViewClient import android.widget.Button import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private var webView: WebView? = null private ... Read More
This example demonstrates how to get all checked items in listView using 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. Step 3 − Create a java class (CustomAdapter.kt) and the following codepackage app.com.myapplication import android.content.Context import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.BaseAdapter import android.widget.CheckBox import android.widget.TextView import android.widget.Toast class CustomAdapter(private val context: Context, private var modelArrayList: ArrayList) : ... Read More
This example demonstrates how to listen for volume buttons in Android background service using 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. Step 3 − Add the following code to src/MainActivity.ktpackage app.com.kotlinapp import android.os.Bundle import android.os.Handler import android.provider.Settings import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private lateinit var settingsContentObserver: SettingsContentObserver override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) settingsContentObserver ... Read More
This example demonstrates how to play sound using SoundPool 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. Step 3 − Create a new Android Resource folder (raw) and copy-paste your sound file in the res/raw/filename.mp3 as shown below −Step 4 − Add the following code to src/MainActivity.ktpackage app.com.myapplication import android.media.AudioManager import android.media.SoundPool import android.os.Bundle import android.view.View import android.widget.Toast import androidx.appcompat.app.AppCompatActivity @Suppress("DEPRECATION") class MainActivity : AppCompatActivity() { private var ... Read More
In this problem, we are given an array of n elements. Our task is to print xor of all prime numbers of the array.Let’s take an example to understand the problem,Input − {2, 6, 8, 9, 11}Output −To solve this problem, we will find all the prime numbers of the array and the xor them to find the result. To check if the element is prime or not, we will use sieve’s algorithm and then xor all elements that are prime.ExampleProgram to show the implementation of our solution, Live Demo#include
In this problem, we are given an array of n elements. Our task is to print XOR of XORs all possible subarrays (taken in order) created from elements of the array.Let’s take an example to understand the problem, Input − array = {1, 3, 6, 8}Output − 0Explanation −(1) ^ (3) ^ (6) ^ (8) ^ (1^3) ^ (3^6)^ (6^8) ^ (1^3^6) ^ (3^6^8) ^ (1^3^6^8)To solve this problem, a simple solution could be iterating over all the subarray and find xors. But this is an inefficient approach. A better approach could be counting the frequency of each element of ... Read More