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Kotlin Articles
Page 18 of 21
How to change the background color of ListView items on Android 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 MoreHow to add new contacts in Android App using Kotlin?
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 MoreHow to get a working vertical SeekBar in Android using Kotlin?
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 MoreHow to use BroadcastReceiver in Kotlin?
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 MoreHow to set a timer in Android using Kotlin?
This example demonstrates how to set a timer 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.Example Step 3 − Add the following code to src/MainActivity.ktexampleimport android.os.Bundle import android.os.CountDownTimer import android.view.View import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { var counter = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" ...
Read MoreHow to create a Expandable listView using Kotlin?
This example demonstrates how to create a Expandable 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.Example Step 3 − Create a new kotlin class CustomExpandableListAdapter.kt and add the following code −Exampleimport android.content.Context import android.graphics.Typeface import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.BaseExpandableListAdapter import android.widget.TextView import java.util.HashMap class CustomExpandableListAdapter internal constructor( private val context: Context, private val titleList: List, private val dataList: HashMap ) : BaseExpandableListAdapter() { ...
Read MoreHow to detect shake events in Kotlin?
This example demonstrates how to detect shake events 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.Context import android.hardware.Sensor import android.hardware.SensorEvent import android.hardware.SensorEventListener import android.hardware.SensorManager import android.os.Bundle import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import java.util.* import kotlin.math.sqrt class MainActivity : AppCompatActivity() { private var sensorManager: SensorManager? = null private var acceleration = 0f private var currentAcceleration = 0f ...
Read MoreBarcode Scanning in Android using Kotlin?
This example demonstrates how to implement bar code scanning 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 the dependency to build.gradle (Module:app)implementation 'com.google.zxing:core:3.3.3' implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'Step 4 − Add the following code to src/MainActivity.ktExampleimport android.content.Intent import android.os.Bundle import android.util.Log import android.widget.Button import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import com.google.zxing.integration.android.IntentIntegrator class MainActivity : AppCompatActivity() { lateinit var btnBarcode: Button lateinit var textView: ...
Read MoreHow to automatically start and stop an Async task in Kotlin?
This example demonstrates how to automatically start and stop an Async task 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.os.AsyncTask import android.os.Bundle import android.view.View import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import kotlinx.android.synthetic.main.activity_main.* import java.lang.ref.WeakReference class MainActivity : AppCompatActivity() { var variable = 10 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) ...
Read MoreHow to stop asynctask thread in Kotlin?
This example demonstrates how to stop an asynctask thread 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.graphics.Color import android.os.AsyncTask import android.os.Bundle import android.view.View import android.widget.Button import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import java.util.* class MainActivity : AppCompatActivity() { private lateinit var btnDo: Button private lateinit var btnCancel: Button private lateinit var textView: TextView private ...
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