Kotlin OptionsMenu
    Settings
    Share
    Exit

package example.javatpoint.com.kotlinoptionsmenu

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast

import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        return when (item.itemId) {
            R.id.action_settings -> {
                Toast.makeText(applicationContext, "click on setting", Toast.LENGTH_LONG).show()
                true
            }
            R.id.action_share ->{
                Toast.makeText(applicationContext, "click on share", Toast.LENGTH_LONG).show()
                return true
            }
            R.id.action_exit ->{
                Toast.makeText(applicationContext, "click on exit", Toast.LENGTH_LONG).show()
                return true
            }
            else -> super.onOptionsItemSelected(item)
        }
    }
}