This example demonstrates how to use Date Time Picker Dialog in 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.             Step 3 − Add the following code to src/MainActivity.ktimport android.app.DatePickerDialog import android.app.TimePickerDialog import android.os.Bundle import android.text.format.DateFormat import android.widget.Button import android.widget.DatePicker import android.widget.TextView import android.widget.TimePicker import androidx.appcompat.app.AppCompatActivity import java.util.* class MainActivity : AppCompatActivity(), DatePickerDialog.OnDateSetListener, TimePickerDialog.OnTimeSetListener {    lateinit var textView: TextView    lateinit var button: Button    var ... Read More

This example demonstrates how to use Snackbar in 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.             Step 3 − Add the following code to src/MainActivity.ktimport android.graphics.Color import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Button import android.widget.TextView import com.google.android.material.snackbar.Snackbar class MainActivity : AppCompatActivity() {    lateinit var button: Button    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp" ... Read More

This example demonstrates how to use CheckBox in 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.                         Step 3 − Add the following code to src/MainActivity.ktimport android.os.Bundle import android.widget.Button import android.widget.CheckBox import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import java.lang.StringBuilder class MainActivity : AppCompatActivity() {    lateinit var pizza: CheckBox    lateinit var coffee: CheckBox    lateinit var burger: CheckBox    lateinit var button: Button ... Read More

This example demonstrates how to use Radio Button in 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.                             Step 3 − Add the following code to src/MainActivity.ktimport android.os.Bundle import android.widget.Button import android.widget.RadioButton import android.widget.RadioGroup import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    var radioGroup: RadioGroup? = null    lateinit var radioButton: RadioButton    private lateinit var button: Button ... Read More

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.             Step 3 − Add the following code to src/MainActivity.ktimport 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 = ArrayList()    lateinit ... Read More

This example demonstrates how to check if a Bluetooth device is connected with an Android device..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.bluetooth.BluetoothDevice import android.content.BroadcastReceiver import android.content.Context import android.content.Intent import android.content.IntentFilter 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 = ... Read More

This example demonstrates how to display a list view in an Android Alert Dialog.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.View import android.widget.ArrayAdapter import android.widget.ListView import android.widget.Toast import androidx.appcompat.app.AlertDialog import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    var country = arrayOf(       "India", "Brazil", "Argentina",       "Portugal", "France", "England", "Italy"    )   ... Read More

This example demonstrates how to start Service using Alarmmanager in 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.ktimport android.app.AlarmManager import android.app.PendingIntent import android.content.Context import android.content.Intent import android.os.Bundle import android.widget.Button import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import java.util.* class MainActivity : AppCompatActivity() {    private lateinit var btnStart: Button    private lateinit var btnStop: Button    lateinit var pendingIntent: PendingIntent ... Read More

This example demonstrates how to pass an image from one activity to another activity 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.content.Intent 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)       title = "KotlinApp"    }    fun ... Read More

This example demonstrates how Save, edit, retrieve, delete shared preference data 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 − Add the following code to src/MainActivity.ktimport android.content.Context import android.content.SharedPreferences import android.os.Bundle import android.view.View import android.widget.EditText import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity @Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS") class MainActivity : AppCompatActivity() {    var editTextName: EditText? = ... Read More