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This example demonstrates how to define underlined text in an Android layout xml file 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.graphics.Color import android.os.Bundle import android.text.SpannableString import android.text.style.UnderlineSpan import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private val string = "This is an underlined textView!" lateinit var textView: TextView override fun onCreate(savedInstanceState: Bundle?) { ... Read More
This example demonstrates how to request Location Permission at runtime on 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.pm.PackageManager import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Toast import androidx.core.app.ActivityCompat import androidx.core.content.ContextCompat class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" if (ContextCompat.checkSelfPermission(this@MainActivity, ... Read More
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