Simple Android Spinner Example in Android Studio

Android Spinner Introduction:-

Android spinner is like the drop down menu with multiple values from which the end user can select only one value.

Android spinner is associated with AdapterView .So we need to set the adapter class with the Spinner.

Here is the demo video of spinner:-

in the activity_main.xml in layout directory, add the Spinner Widget and code look like as below:-

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">
  
  <TextView
      android:layout_width="match_parent"
      android:text="Color"
      android:textSize="20dp"
      android:layout_height="wrap_content">
  </TextView>
  <Spinner
      android:id="@+id/spinner"
      android:layout_width="match_parent"
      android:layout_height="wrap_content">
  </Spinner>
  
</LinearLayout>

Finally, In MainActivity.java class , add the following code:-

MainActivity.java

package com.androidcreation.spinner;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.AppCompatSpinner;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;


import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Spinner element
        final Spinner spinner = (Spinner) findViewById(R.id.spinner);
        // Spinner click listener
        spinner.setOnItemSelectedListener(this);
        // Spinner Drop down elements
        List<String> color = new ArrayList<String>();
        color.add("RED");
        color.add("BLUE");
        color.add("BLACK");
        color.add("WHITE");
        color.add("YELLOW");
        color.add("GREEN");

        // Creating adapter for spinner
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, color);

        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // attaching data adapter to spinner
        spinner.setAdapter(dataAdapter);


    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        // On selecting a spinner item
        String item = parent.getItemAtPosition(position).toString();

        // Showing selected spinner item
        Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

    }

    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }

}