Spineer view open next Page

 <Spinner

    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/spineer"/>

package com.niranjan.covid;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
Spinner spinner;
String[] page = {"Choose Option","user","admin","hospital"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinner=findViewById(R.id.spineer);
        spinner.setOnItemSelectedListener(this);
        ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item,page);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                if (adapterView.getItemAtPosition(i).equals("user"))
                {
                    Intent intent = new Intent(MainActivity.this,User.class);
                    startActivity(intent);

                }else {
                }
                if (adapterView.getItemAtPosition(i).equals("admin"))
                {
                    Intent intent = new Intent(MainActivity.this,Admin.class);
                    startActivity(intent);
                }else {

                }
                if (adapterView.getItemAtPosition(i).equals("hospital"))
                {
                    Intent intent = new Intent(MainActivity.this,Hospital.class);
                    startActivity(intent);
                }else {
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
    }

    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {

    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {

    }
}