First_Activity.kt

package com.example.spoken.searchapp

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.Spinner
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_first.*

class FirstActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_first)


        var fossVsFossID = HashMap<String, Int>()
        fossVsFossID.put("Java", 10)
        fossVsFossID.put("Cpp", 57)
        fossVsFossID.put("Python", 26)
        fossVsFossID.put("RDBMS", 92)


        var languageVsLanguageID = HashMap<String, Int>()
        languageVsLanguageID.put("English", 22)
        languageVsLanguageID.put("Hindi", 6)
        languageVsLanguageID.put("Gujarati", 5)
        languageVsLanguageID.put("Tamil", 18)
        languageVsLanguageID.put("Marathi", 12)
        languageVsLanguageID.put("Kannada", 7)

        var fossVsLanguage = HashMap<String, ArrayList<String>>()
        var availableLanguagesForFoss: ArrayList<String>

        availableLanguagesForFoss = arrayListOf("English", "Gujarati","Hindi",  "Kannada")
        fossVsLanguage.put("Java", availableLanguagesForFoss)

        availableLanguagesForFoss = arrayListOf("English", "Gujarati", "Hindi","Kannada", "Marathi", "Tamil")
        fossVsLanguage.put("Cpp", availableLanguagesForFoss)

        availableLanguagesForFoss = arrayListOf("English", "Hindi")
        fossVsLanguage.put("Python", availableLanguagesForFoss)

        availableLanguagesForFoss = arrayListOf("English")
        fossVsLanguage.put("RDBMS", availableLanguagesForFoss)

        var fossSpinner = findViewById<Spinner>(R.id.Spinner1)

        var languageSpinner = findViewById<Spinner>(R.id.Spinner2)
        var fossOptions = fossVsFossID.keys.toList()
        var languageOptions = languageVsLanguageID.keys.toMutableList()


        var selectedFoss = "none"
        var selectedLanguage = "none"
        var fossAdapter = ArrayAdapter<String>(applicationContext, android.R.layout.simple_list_item_activated_1, fossOptions)
        fossSpinner.adapter = fossAdapter

        var languageAdapter = ArrayAdapter<String>(applicationContext, android.R.layout.simple_list_item_activated_1, languageOptions)

        languageSpinner.adapter = languageAdapter

        fossSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {



            override fun onNothingSelected(parent: AdapterView<*>?) {
            }

            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {

                languageOptions.clear()

                selectedFoss = fossOptions.get(position)

                languageOptions.addAll(ArrayList(fossVsLanguage.get(selectedFoss)))

                languageAdapter.notifyDataSetChanged()
            }
        }

        languageSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onNothingSelected(parent: AdapterView<*>?) {
            }

            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {

                selectedLanguage = languageOptions.get(position)
            }
        }


        searchButton.setOnClickListener {
            if (selectedFoss == "none" || selectedLanguage == "none") {

                Toast.makeText(this, "Please select FOSS and Language both", Toast.LENGTH_SHORT).show()

            } else {

                var fossID = fossVsFossID.get(selectedFoss)
                var languageID = languageVsLanguageID.get(selectedLanguage)
		
                var searchIntent = Intent(this, SecondActivity::class.java).apply {
                    putExtra("fossID", "" + fossID)
                    putExtra("languageID", "" + languageID)
                }

                startActivity(searchIntent)
            }
        }

    }
}


Second_Activity.kt

package com.example.spoken.searchapp

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_second.*

class SecondActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)

        var foss = intent.getStringExtra("fossID")
        var language = intent.getStringExtra("languageID")
        selectedOption.text = "Foss ID : " + foss + "\nLanguage ID : " + language
    }
}
by

Kotlin online compiler

Write, Run & Share Kotlin code online using OneCompiler’s Kotlin online compiler for free. It’s a modern and fast online playground for Kotlin, supporting the latest version and ideal for learning, experimenting, and sharing code instantly.

About Kotlin

Kotlin is a statically typed, modern programming language developed by JetBrains. It runs on the JVM and is fully interoperable with Java. Kotlin is concise, expressive, and safe, and it’s officially supported by Google for Android app development.

Sample Code

The following is a simple Kotlin program that prints a greeting:

fun main() {
    println("Hello, OneCompiler!")
}

Taking inputs (stdin)

OneCompiler’s Kotlin editor supports stdin. You can provide input using the I/O tab. Here's a sample program that reads a line of input and prints a greeting:

fun main() {
    print("Enter your name: ")
    val name = readLine()
    println("Hello, $name")
}

Syntax Basics

Variables

val name: String = "OneCompiler"  // Immutable
var age: Int = 25                 // Mutable

Kotlin supports type inference, so explicit types are optional:

val city = "Hyderabad"
var count = 10

Conditionals

val score = 85
if (score >= 50) {
    println("Pass")
} else {
    println("Fail")
}

Loops

For loop

for (i in 1..5) {
    println(i)
}

While loop

var i = 1
while (i <= 5) {
    println(i)
    i++
}

Do-While loop

var j = 1
do {
    println(j)
    j++
} while (j <= 5)

Functions

fun add(a: Int, b: Int): Int {
    return a + b
}

fun greet(name: String) = "Hello, $name"

Collections

val items = listOf("apple", "banana", "cherry")
for (item in items) {
    println(item)
}

This guide provides a quick reference to Kotlin programming syntax and features. Start coding in Kotlin using OneCompiler’s Kotlin online compiler today!