This example demonstrates how to create a Custom Ratingbar in Android 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.ktimport android.os.Bundle import android.widget.Button import android.widget.RatingBar import android.widget.RatingBar.OnRatingBarChangeListener import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var ratingBar: RatingBar    lateinit var button: Button    lateinit var textView: TextView    override fun onCreate(savedInstanceState: Bundle?) { ... Read More

This example demonstrates how to detect application heap size in Android 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.ktimport android.app.ActivityManager import android.content.Context import android.os.Bundle import android.view.View import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import java.util.* class MainActivity : AppCompatActivity() {    private lateinit var textView: TextView    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main) ... Read More

This example demonstrates how to open a Facebook page from an Android app using KotlinStep 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.ktimport android.content.Intent import android.net.Uri import android.os.Bundle import android.view.View import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)    }    fun fbClick(view: View) {       startActivity(getOpenFacebookIntent());   ... Read More

This example demonstrates how to restart an Android Activity 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.ktimport android.os.Bundle import android.widget.Button import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import java.util.* class MainActivity : AppCompatActivity() {    lateinit var textView: TextView    lateinit var button: Button    var random: Random = Random()    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState) ... Read More

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.ktimport android.content.res.Configuration import android.os.Bundle import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"    }    override fun onConfigurationChanged(newConfig: Configuration) {       super.onConfigurationChanged(newConfig)       if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { ... Read More

This example demonstrates how to disable the back button in android while logging out the application 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.ktimport android.os.Bundle import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)    }    override fun onBackPressed() {       Toast.makeText(applicationContext, "Disabled Back ... Read More

This example demonstrates how to implement Android imageView zoom-in and Zoom out 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.ktimport android.os.Bundle import android.view.MotionEvent import android.view.ScaleGestureDetector import android.view.ScaleGestureDetector.SimpleOnScaleGestureListener import android.widget.ImageView import androidx.appcompat.app.AppCompatActivity import kotlin.math.max import kotlin.math.min class MainActivity : AppCompatActivity() {    private lateinit var scaleGestureDetector: ScaleGestureDetector    private var scaleFactor = 1.0f    private lateinit var imageView: ImageView    override fun ... Read More

This example demonstrates how to Create Left to Right slide animation in Android 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.ktimport android.os.Bundle import android.transition.Slide import android.transition.TransitionManager import android.view.Gravity import android.view.View import android.widget.Button import android.widget.RelativeLayout import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var btnSlideLeft: Button    lateinit var btnSlideRight: Button    lateinit var ... Read More

This example demonstrates how to Send an Intent to browser to open specific URL using KotlinStep 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         Step 3 − Add the following code to src/MainActivity.ktExampleimport android.content.Intent import android.net.Uri import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"    }   ... Read More

This example demonstrates how to validate an e-mail address in Android 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.kt import android.import android.os.Bundle import android.view.View import android.widget.EditText import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    private lateinit var editText: EditText    private lateinit var email: String    private val emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\.+[a-z]+"    override fun onCreate(savedInstanceState: ... Read More