Answers for "kotlin tutorial"

kotlin for beginners

1. OPEN ANDROID STUDIO 
1. MAKE NEW PROJECT IN KOTLIN 
3. COPY PASTE THE BELOW LINES OF CODES IN XML AND MAIN ACTIVITY RESPECTIVILY

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
  
  
  
  
Package com.example.firstkotlinproject

import android.annotation.SuppressLint
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    @SuppressLint("SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        supportActionBar?.hide()

        val tv : TextView = findViewById(R.id.tv)
        tv.text = "first kotlin project"

    }
}

kotlin syntax

fun main(args : Array<String>) { 
  println("Hello World") 
}

kotlin syntax

val x = 5
val y = 6
println(x + y) // Print the value of x + y

kotlin with

with(file){
    load()
    modify()
    save()
}

kotlin vs java

Kotlin is a language built on and entirely backwards-compatible with Java.
While Java is Object-Oriented first, Kotlin supports a blend
of OO and functional paradigms. For further information, refer to
kotlinlang.org

Kotlin Tutorial Android for beginners

1. OPEN ANDROID STUDIO 
1. MAKE NEW PROJECT IN KOTLIN 
3. COPY PASTE THE BELOW LINES OF CODES IN XML AND MAIN ACTIVITY RESPECTIVILY

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
  
  
  
  
Package com.example.firstkotlinproject

import android.annotation.SuppressLint
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    @SuppressLint("SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        supportActionBar?.hide()

        val tv : TextView = findViewById(R.id.tv)
        tv.text = "first kotlin project"

    }
}