listview

MAIN:

package com.example.agatarychter.swim2;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private ArrayList<Person> arrayList;
    private static final int REQUEST_CODE  =1;
    private MyAdapter adapter;
    public int [] IMAGES = {R.drawable.baby};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ListView listView= findViewById(R.id.my_list_view);
        arrayList = new ArrayList<>();
        adapter = new MyAdapter();
        listView.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.add_icon:
                startActivityForResult(new Intent(getApplicationContext(),Add.class),REQUEST_CODE);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

   public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1) {
                String name = data.getStringExtra(Add.NAME_TO_SAVE);
                String surname = data.getStringExtra(Add.SURNAME_TO_SAVE);
                String age = data.getStringExtra(Add.DATE_TO_SAVE);
                arrayList.add(new Person(name,surname,Integer.parseInt(age)));
                adapter.notifyDataSetChanged();
        }

    }
    class MyAdapter extends BaseAdapter{

        public MyAdapter(){
        }
        @Override
        public int getCount() {
            return arrayList.size();
        }

        @Override
        public Object getItem(int i) {
            return null;
        }

        @Override
        public long getItemId(int i) {
            return 0;
        }

        @Override
        public View getView(final int i, View newView, ViewGroup viewGroup) {
            View view;
            if(newView==null)
            {
                newView = getLayoutInflater().inflate(R.layout.single_item,null);
            }
            view= newView;
            view = getLayoutInflater().inflate(R.layout.single_item,null);
            ImageView imageView = view.findViewById(R.id.imageView);
            TextView name_txt = view.findViewById(R.id.name_item);
            TextView surname_txt = view.findViewById(R.id.surname_item);
            TextView age_txt = view.findViewById(R.id.age);
            ImageButton imageButton = view.findViewById(R.id.erase_btn);

            name_txt.setText(arrayList.get(i).getName());
            surname_txt.setText(arrayList.get(i).getSurname());
            String age_info = age_txt.getText().toString() + Integer.toString(arrayList.get(i).getAge()) + "years ";
            age_txt.setText(age_info);

//            imageView.setImageResource(IMAGES[0]);

            imageButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    arrayList.remove(i);
                    notifyDataSetChanged();
                }
            });
            return view;
        }
    }
}






ADDING:
package com.example.agatarychter.swim2;

import android.app.DatePickerDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v4.app.NavUtils;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;

public class Add extends AppCompatActivity {

    private EditText name;
    private EditText surname;
    public static final String NAME_TO_SAVE = "Name";
    public static final String SURNAME_TO_SAVE = "Surname";
    public static final String DATE_TO_SAVE = "Date";
    private DatePickerDialog.OnDateSetListener dateSetListener;
    private int age;
    private Calendar calendar;
    private static final int DEFAULT_AGE = -1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add);
        age = DEFAULT_AGE;
        name = findViewById(R.id.first_name);
        surname = findViewById(R.id.surname);
        calendar = Calendar.getInstance();
        Button calendar_button = findViewById(R.id.date_button);
        calendar_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int year = calendar.get(Calendar.YEAR);
                int month = calendar.get(Calendar.MONTH);
                int day = calendar.get(Calendar.DAY_OF_MONTH);
                DatePickerDialog datePickerDialog = new DatePickerDialog(Add.this,android.R.style.Theme_Holo_Dialog_MinWidth,dateSetListener,year,month,day);
                datePickerDialog.show();
            }
        });


        dateSetListener = new DatePickerDialog.OnDateSetListener()
        {
            @Override
            public void onDateSet(DatePicker datePicker, int year, int month, int day) {
                long dateToday = calendar.getTimeInMillis();
                Calendar calendarChosen = Calendar.getInstance();
                calendarChosen.set(year,month,day);
                long chosenDate = (calendarChosen.getTimeInMillis());
                if(chosenDate>=dateToday)
                {
                    Toast.makeText(getApplicationContext(), R.string.wrong_date, Toast.LENGTH_SHORT).show();
                }
                else
                    age = getAge(calendar,calendarChosen);
            }
        };
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_add, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.done_icon:
                if(surname.getText().toString().length()==0|| name.getText().toString().length()==0 ||age==DEFAULT_AGE)
                {
                    Toast.makeText(getApplicationContext(), R.string.enter_data, Toast.LENGTH_SHORT).show();
                }
                else {
                    sendData();
                }
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void sendData() {
        Intent intent = new Intent();

        intent.putExtra(NAME_TO_SAVE,name.getText().toString());
        intent.putExtra(SURNAME_TO_SAVE,surname.getText().toString());
        intent.putExtra(DATE_TO_SAVE,Integer.toString(age));
        setResult(1,intent);
        finish();
    }
//
    private int getAge(Calendar calendarToday,Calendar calendarChosen) {
        int years = calendarToday.get(Calendar.YEAR) - calendarChosen.get(Calendar.YEAR);
        // now make the earlier date the same year as the later
        calendarChosen.set(Calendar.YEAR, calendarToday.get(Calendar.YEAR));
        // and see if new date become later, if so then one year was not whole, so subtract 1
        if(calendarChosen.getTimeInMillis() > calendarToday.getTimeInMillis())
            years--;
        return years;
    }
}