package com.sandep.myapp

import android.Manifest
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Bundle
import android.os.Handler
import android.os.Looper
import android.telephony.TelephonyManager
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import java.lang.reflect.Method

class MainActivity : AppCompatActivity() {

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

        val friendsNumbers = listOf("friend1ActualNumber", "friend2ActualNumber") // Replace with actual numbers

        val missedCallButton: Button = findViewById(R.id.missedCallButton)
        missedCallButton.setOnClickListener {
            for (number in friendsNumbers) {
                val intent = Intent(Intent.ACTION_CALL)
                intent.data = Uri.parse("tel:$number")

                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED) {
                    startActivity(intent)
                    Handler(Looper.getMainLooper()).postDelayed({
                        endCall()
                    }, 2000) 
                } else {
                    ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CALL_PHONE), 1)
                }
            }
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == 1) {
            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission granted. You can retry making the call here or inform the user.
                Toast.makeText(this, "Permission granted. You can now make calls.", Toast.LENGTH_SHORT).show()
            } else {
                // Permission denied. Inform the user.
                Toast.makeText(this, "Permission denied. Can't make calls.", Toast.LENGTH_SHORT).show()
            }
        }
    }

    private fun endCall() {
        try {
            val telephonyManager = this.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
            val telephonyClass = Class.forName(telephonyManager.javaClass.name)
            val method: Method = telephonyClass.getDeclaredMethod("getITelephony")
            method.isAccessible = true
            val telephonyInterface = method.invoke(telephonyManager)
            val telephonyInterfaceClass = Class.forName(telephonyInterface.javaClass.name)
            val endCallMethod: Method = telephonyInterfaceClass.getDeclaredMethod("endCall")
            endCallMethod.invoke(telephonyInterface)
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }
}
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!