Android Spinner is used to display the multiple options in which the user can select only one item. In other words Spinner is like as drop-down menu. 

1. activity_main.xml

<?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">
 
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:gravity="left"
        android:layout_toRightOf="@+id/spinnertxt"
        >
 
    </Spinner>
    <TextView
        android:id="@+id/spinnertxt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25dp"
        android:layout_marginLeft="20dp"
        android:textColor="#000"
        android:layout_marginTop="25dp"
        />
 
</RelativeLayout>

2. MainActivity.java

package com.example.spinner;
 
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
 
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
 
import java.util.ArrayList;
import java.util.List;
 
public class MainActivity extends AppCompatActivity {
    Spinner spinner;
    List<String> list;
    ArrayAdapter<String> SpinnerAdapter;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinner = (Spinner)findViewById(R.id.spinner);
        list = new ArrayList<String>();
        list.add("Select your Favorite Color");
        list.add("Blue");
        list.add("White");
        list.add("Red");
        list.add("Green");
        list.add("Black");
        list.add("Yellow");
        list.add("Pink");
        list.add("Orange");
        SpinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list){
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
               View v = super.getView(position, convertView, parent);
                ((TextView)v).setTextColor(getResources().getColor(R.color.colorPrimary));
                return v;
            }
 
            @Override
            public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
                View v = super.getDropDownView(position, convertView, parent);
                v.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
                return v;
            }
        };
        SpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(SpinnerAdapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                String state = adapterView.getItemAtPosition(i).toString();
            }
 
            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {
 
            }
        });
    }
}

Output:  

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