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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to declare multiple resources in a try-with-resources statement in Java 9?
Try-with-resources statement has been improved in Java 9. If we already have a resource that is final or equivalent to the final variable, then we can use that variable in a try-with-resources statement without having to declare a new variable in a try-with-resources statement.We can declare multiple resources in a try block. Try initialization block can have any number of resources resulting in either null or non-null resources.In the below example, we can able to declare multiple resources in the try-with-resources statement.Exampleimport java.io.BufferedReader; import java.io.IOException; import java.io.Reader; import java.io.StringReader; public class MultipleResourcesTest { public static void ...
Read MoreHow to implement integer type conversion in JShell in Java 9?
JShell is a command-line interactive tool introduced in Java 9 version that allows the programmer to execute simple statements, expressions, variables, methods, classes, interfaces, etc.. without declaring the main() method.In JShell, the compiler warns the programmer about typecasting issues by throwing errors. However, if the programmer is aware of it, then explicit casting will be required. If we need to store a smaller data value into a larger type conversion, then implicit casting will be required.There are two kinds of integer typecasting:Literal-to-variable assignment: For instance, short s1 = 123456, the data is out of range. It is known at compile-time, ...
Read MoreHow to use ArrayAdapter in android to create a simple listview in Kotlin?
This example demonstrates how to use ArrayAdapter in android to create a simple listview 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 MainActivity.ktimport android.os.Bundle import android.widget.ArrayAdapter import android.widget.ListView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" val arrayAdapter: ArrayAdapter ...
Read MoreHow to use SearchView in the Toolbar in Kotlin?
This example demonstrates how to use SearchView in the Toolbar 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 − Open res/strings.xml and add the following code− Q38 January February March April May June July August ...
Read MoreHow to get Spinner value in Kotlin?
This example demonstrates how to get Spinner value 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 − Open res/strings.xml and add the following code − Q39 crane Cuckoo Pigeon Eagle Owl Vulture WoodPecker Step 4 − Add the ...
Read MoreHow to programmatically turn off and turn on WiFi in Kotlin?
This example demonstrates programmatically turning off and turning on WiFi 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 MainActivity.ktimport android.net.wifi.WifiManager import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.Toast class MainActivity : AppCompatActivity() { lateinit var wifiManager: WifiManager override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" ...
Read MoreHow to integrate Facebook using Kotlin?
This example demonstrates how to integrate Facebook 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 − In your project, open your_app | Gradle Scripts | build.gradle (Module: app) and add the following compile statement to the dependencies{} section to compile the latest version of the SDK −implementation 'com.facebook.android:facebook-login:5.15.3'Step 3 − Add your package name and default activity class name as shown below, click save and continue.Step 4 − Create a Key hash. Based on your operating system you have to copy ...
Read MoreHow to play videos in Android TextureView using Kotlin?
This example demonstrates how to play videos in Android TextureView 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 − Create an asset folder and copy-paste the video into the asset folder.Step 4 − Add the following code to MainActivity.ktimport android.content.res.AssetFileDescriptor import android.graphics.SurfaceTexture import android.media.MediaPlayer import android.media.MediaPlayer.OnVideoSizeChangedListener import android.os.Build import android.os.Bundle import android.view.Surface import android.view.TextureView import android.view.TextureView.SurfaceTextureListener import androidx.appcompat.app.AppCompatActivity import java.io.IOException class MainActivity : AppCompatActivity(), SurfaceTextureListener, OnVideoSizeChangedListener { private ...
Read MoreHow to use the TextWatcher class in kotlin?
This example demonstrates how to use the TextWatcher class 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 MainActivity.ktimport android.os.Bundle import android.text.Editable import android.text.TextWatcher import android.widget.EditText import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { lateinit var input: EditText lateinit var output: TextView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) ...
Read MoreHow to create Text to Speech in an Android App using Kotlin?
This example demonstrates how to create Text to Speech in an Android App 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 MainActivity.ktimport android.app.Activity import android.content.Intent import android.os.Bundle import android.speech.RecognizerIntent import android.widget.ImageView import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import java.util.* import kotlin.collections.ArrayList class MainActivity : AppCompatActivity() { private val REQUESTCODE = ...
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