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Articles on Trending Technologies
Technical articles with clear explanations and examples
How 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 = ...
Read MoreHow to use Date Time Picker Dialog in Kotlin Android?
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 MoreHow to use CheckBox in Android Kotlin?
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 MoreWhat are the rules for the Subscriber interface in Java 9?
Subscriber interface subscribes to publishers to receive items through onNext() method, error message through the onError() method, or a signal that no more items to be expected through the onComplete() method. Before any of those things happen, the publisher calls onSubscription() method.public interface Subscriber { public void onSubscribe(Subscription s); public void onNext(T t); public void onError(Throwable t); public void onComplete(); }Rules for Subscriber interface:A Subscriber must call through Subscription.request(long n) method to receive onNext() signals.Subscriber.onComplete() and Subscriber.onError(Throwable t) methods must not call any methods on Subscription or Publisher.Subscriber.onComplete() and Subscriber.onError(Throwable t) methods must consider the Subscription canceled after received ...
Read MoreHow to create a process using ProcessBuilder in Java 9?
Java 9 added ProcessHandle interface to Process API to enhance Process class. An instance of the ProcessHandle interface identifies a local process that allows us to query process status and managing processes, and ProcessHandle.Info allows us to use local code because of the need to obtain the PID of a local process.ProcessBuilder class can be used to create separate operating system processes. In the below example, we can create a process of "notepad" application by using the ProcessBuilder class.Exampleimport java.time.ZoneId; import java.util.stream.Stream; import java.util.stream.Collectors; import java.io.IOException; public class ProcessBuilderTest { public static void main(String args[]) throws IOException { ProcessBuilder pb = new ProcessBuilder("notepad.exe"); ...
Read MoreShared Preferences - Save, edit, retrieve, delete in Kotlin?
This example demonstrates how Save, edit, retrieve, delete shared preference data 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.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 @Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS") class MainActivity : AppCompatActivity() { var editTextName: EditText? = ...
Read MoreHow can I use marquee text in Kotlin?
This example demonstrates how to use marquee text 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 src/MainActivity.ktimport androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.TextView class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" val text: String = "Simple application that shows how ...
Read MoreSend data from one Fragment to another using Kotlin?
This example demonstrates how to send data from one Fragment to another 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 two FragmentActivity and add the codes which are given below.fragmentOne.xml − FirstFragment.kt −import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.fragment.app.Fragment import kotlinx.android.synthetic.main.fragment_one.view.* class FirstFragment : Fragment() { private lateinit var communicator: Communicator override fun onCreateView( inflater: LayoutInflater, ...
Read MoreHow to use a simple SQLite database in Kotlin android?
This example demonstrates how to use a simple SQLite database in Kotlin android.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.
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