Spineer View

 XML Code :- 

<Spinner
    android:id="@+id/spineer"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    />

->Value file-> Srting file  ->

<string-array name="covid">
    <item>Covid Test</item>
    <item>Covid vaccine</item>
</string-array>

Java :- 

package com.niranjan.covid19apps.user;

import androidx.appcompat.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;

import com.niranjan.covid19apps.R;

public class Appoinment extends AppCompatActivity implements AdapterView.OnItemSelectedListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_appoinment);
        Spinner spinner=findViewById(R.id.spineer);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,R.array.covid, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);
    }


    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        String text = adapterView.getItemAtPosition(i).toString();
        Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
    }

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

    }
}