Android Spinner Kotlin

15-Sep-2024

How to implement a Spinner in Android Studio project to let users select from a dropdown list

Create a simple example of using a Spinnerin Android. In this example, we'll create an Android app with a Spinner, and the user can set the select data using the Spinner. We'll also display a toast message with the selected Spinner.

Here is the tutorial for Java

There Are Some Common Attributes for Spinner:

id	This ID serves as the control's unique identity.
layout_width	match_parent -> Text area contains fullscreen wrap_content-> Text area contains only text size
layout_width	match_parent -> Text area contains fullscreen wrap_content-> Text area contains only text size

Step 1:

File open res/layout/activity_main.xml file −


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">
        <Spinner
            android:id="@+id/spinner"
            android:layout_width="200dp"
            android:layout_height="wrap_content" />
    </LinearLayout>


</RelativeLayout>

Step 2:

File open com.microappvalley.newtestproject/MainActivity.kt file −

Kotlin:


package com.microappvalley.newtestproject

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

class MainActivity : AppCompatActivity() {

    lateinit var spinner: Spinner

    var spinnerArray= arrayOf("Java","Kotlin","JetPack","Flutter")

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

        spinner= findViewById(R.id.spinner)
        val adapter=ArrayAdapter(this,android.R.layout.simple_expandable_list_item_1,spinnerArray)
        spinner.adapter=adapter

    }
}