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How to set selected item of Spinner programmatically in Android

https://android--code.blogspot.com/2015/08/android-spinner-set-selected-item.html

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#83b3cd"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Select Third Item From Spinner"
        />
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn"
        />
</RelativeLayout>
spinner_item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:textStyle="italic"
    android:fontFamily="sans-serif-medium"
    android:background="#fcba14"
    />
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

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


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get reference of widgets from XML layout
        final Spinner spinner = (Spinner) findViewById(R.id.spinner);
        Button btn = (Button) findViewById(R.id.btn);

        // Initializing a String Array
        String[] plants = new String[]{
                "Laceflower",
                "Sugar maple",
                "Mountain mahogany",
                "Butterfly weed"
        };

        final List<String> plantsList = new ArrayList<>(Arrays.asList(plants));

        // Initializing an ArrayAdapter
        final ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
                this,R.layout.spinner_item,plantsList);

        spinnerArrayAdapter.setDropDownViewResource(R.layout.spinner_item);
        spinner.setAdapter(spinnerArrayAdapter);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Select the Spinner element at index position 2
                // It will select third element/item from Spinner
                spinner.setSelection(2);
            }
        });
   }
}
 
 
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