How to Dropdown List in Android

 MainActivity.java

package com.example.spinnerexample;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

String[] users = { "Suresh Dasari", "Trishika Dasari", "Rohini Alavala", "Praveen Kumar", "Madhav Sai" };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Spinner spin = (Spinner) findViewById(R.id.spinner1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, users);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        spin.setAdapter(adapter);

        spin.setOnItemSelectedListener(this);

    }

    @Override

    public void onItemSelected(AdapterView<?> arg0, View arg1, int position,long id) {

        Toast.makeText(getApplicationContext(), "Selected User: "+users[position] ,Toast.LENGTH_SHORT).show();

    }

    @Override

    public void onNothingSelected(AdapterView<?> arg0) {

        // TODO - Custom Code

    }

}