AppointmentActivity.java

package com.example.covid19vaccine;

import android.app.DatePickerDialog;
import android.os.Bundle;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Calendar;

public class AppointmentActivity extends AppCompatActivity {

    private TextView selectedDateTextView;
    private Button selectDateButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_appointment);

        selectedDateTextView = findViewById(R.id.selectedDateTextView);
        selectDateButton = findViewById(R.id.selectDateButton);

        selectDateButton.setOnClickListener(view -> showDatePickerDialog());
    }
// Only for new covid date dialogs
    private void showDatePickerDialog() {
        final Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog datePickerDialog = new DatePickerDialog(
                AppointmentActivity.this,
                (view, year1, monthOfYear, dayOfMonth) -> {
                    String selectedDate = dayOfMonth + "/" + (monthOfYear + 1) + "/" + year1;
                    selectedDateTextView.setText(selectedDate);
                },
                year, month, day
        );
        datePickerDialog.show();
    }
}