Found 417 Articles for 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     Step 3 − Add the following code to src/MainActivity.ktExampleimport 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 ... Read More

This example demonstrates how to determine if network type (2G, 3G or 4G) 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.Example                     Step 3 − Add the following code to src/MainActivity.ktExampleimport android.app.Activity import android.content.Intent import android.os.Bundle import android.provider.ContactsContract import android.view.View import android.widget.EditText import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)     ... Read More

This example demonstrates how to determine if network type (2G, 3G or 4G) 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.Example         Step 4 − Add the following code to src/MainActivity.ktExampleimport android.content.Context import android.os.Bundle import android.telephony.TelephonyManager import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import java.util.* 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 display animated GIF images 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 dependency in build.gradle (module:app)implementation 'com.github.bumptech.glide:glide:4.9.0'Step 3 − Add the following code to res/layout/activity_main.xml.Example         Step 4 − Add the following code to src/MainActivity.ktExampleimport android.os.Bundle import android.view.View import android.widget.ImageView import androidx.appcompat.app.AppCompatActivity import com.bumptech.glide.Glide class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       ... Read More

This example demonstrates how to call a method after a delay 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.Example             Step 3 − Add the following code to src/MainActivity.ktExampleimport android.os.Bundle import android.os.Handler import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var textView: TextView    private val string = "Delay by 5 seconds"    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState) ... Read More

This example demonstrates how to save a HashMap to Sharedpreferences 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.Example                     Step 3 − Add the following code to src/MainActivity.ktExampleimport 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 import org.json.JSONObject import java.util.* import kotlin.collections.HashMap class MainActivity : AppCompatActivity() {    private val mapKey = "map"    lateinit ... 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.Example         Step 3 − Add the following code to src/MainActivity.ktExampleimport android.os.Bundle import android.widget.SeekBar import android.widget.SeekBar.OnSeekBarChangeListener import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var seekBar: SeekBar    lateinit var textView: TextView    var min = 0    var max: Int = 100    var current: Int ... Read More

This example demonstrates how to use BroadcastReceiver 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.Example         Step 3 − Add the following code to src/MainActivity.ktExampleimport android.content.BroadcastReceiver import android.content.Context import android.content.Intent import android.content.IntentFilter import android.net.wifi.WifiManager import android.os.Bundle import android.widget.Switch import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var wifiSwitch: Switch    lateinit var wifiManager: WifiManager    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)     ... Read More

This example demonstrates how to pass an arrayList to another activity using intents 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.Example             Step 3 − Add the following code to src/MainActivity.ktExampleimport android.content.Intent import android.os.Bundle import android.widget.Button import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var button: Button    var numbers: ArrayList = ArrayList()    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)     ... Read More

This example demonstrates how to develop an Speech recognizer in Android without Google API 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.Example                 Step 3 − Add the following code to src/MainActivity.ktExampleimport android.Manifest import android.content.Intent import android.content.pm.PackageManager import android.os.Bundle import android.speech.RecognitionListener import android.speech.RecognizerIntent import android.speech.SpeechRecognizer import android.util.Log import android.view.View import android.widget.ProgressBar import android.widget.TextView import android.widget.Toast import android.widget.ToggleButton import androidx.appcompat.app.AppCompatActivity import androidx.core.app.ActivityCompat class MainActivity : AppCompatActivity(), ... Read More