How to set selected item of Spinner programmatically in Android

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         selesai 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"         };          selesai List<String> plantsList = new ArrayList<>(Arrays.asList(plants));          // Initializing an ArrayAdapter         selesai 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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