Simple example of using Spinner in Kotlin | Android

Though Kotlin has lot massive features to speedup the development time, here is the simple way of using Spinner in Android. In Kotlin we don't need to declare and initialize Spinner. We can simply access the id of Spinner from xml.

Ex :

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.Toast
import android.widget.Toast.LENGTH_LONG
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

        //String array.
        val myStrings = arrayOf("One", "Two", "Three", "Four", "Five")
        
        //Adapter for spinner
        mySpinner.adapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, myStrings)
        
        //item selected listener for spinner
        mySpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onNothingSelected(p0: AdapterView<*>?) {
                TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
            }

            override fun onItemSelected(p0: AdapterView<*>?, p1: View?, p2: Int, p3: Long) {
                Toast.makeText(this@MainActivity, myStrings[p2], LENGTH_LONG).show()
            }

        }
    }
}

Did you noticed, we never declare myCheckBox nor initialized, instead we directly accessed it from activity_main.
And also there is no new keyword while ArrayAdapter or implementing OnItemSelectedListener.

So, If you think this is the right time to start with Kotlin, then start alongside with your current project. Yes, you can use Java and Kotlin in same project. If your current Activity is java, don't worry, you can create your next Activity in kotlin. Or you can convert your current Activity also to Kotlin and then continue learning Kotlin in same Activity.

Here is the full video tutorial

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