Found 417 Articles for Kotlin

This example demonstrates how to implement a MediaPlayer class to implement a basic Audio Player in an Android Kotlin app.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 MainActivity.ktimport android.media.MediaPlayer import android.os.Bundle import android.os.Handler import android.widget.ImageButton import android.widget.SeekBar import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import kotlinx.android.synthetic.main.activity_main.* import java.util.concurrent.TimeUnit ... Read More

This example demonstrates how to set a Timeout for an AsyncTask 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.app.ProgressDialog import android.os.AsyncTask import android.os.Bundle import android.view.View import android.widget.Button import android.widget.EditText import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    var button: Button? = null    var editTextTime: EditText? = null    override fun onCreate(savedInstanceState: Bundle?) { ... Read More

This example demonstrates how to show a progress dialog 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.ProgressDialog import androidx.appcompat.app.AppCompatActivity import android.os.Bundle @Suppress("DEPRECATION") class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       val progressDialog = ProgressDialog(this@MainActivity)     ... Read More

This example demonstrates how to iterate a JSON Array 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.TextView import androidx.appcompat.app.AppCompatActivity import org.json.JSONObject @Suppress("NAME_SHADOWING") class MainActivity : AppCompatActivity() {    private lateinit var textView: TextView    var strJson = ("{ \"Employee\" :[{\"ID\":\"01\", \"Name\":\"Sam\", \"Salary\":\"50000\"}, " + "{\"ID\":\"02\", \"Name\":\"Shankar\", \"Salary\":\"60000\"}] }")    override fun onCreate(savedInstanceState: Bundle?) { ... Read More

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