gregorian calender

package com.example.mz_counter;


import androidx.appcompat.app.AppCompatActivity;


import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
import java.util.GregorianCalendar;


public class MainActivity extends AppCompatActivity {


    private EditText editText1;
    private EditText editText2;//Tag
    private EditText editText3;//Monat
    private EditText editText4;//Jahr


    //int iy = Integer.parseInt(String.valueOf(findViewById(R.id.year)));
    //int im = Integer.parseInt(String.valueOf(findViewById(R.id.month)));
    //int id = Integer.parseInt(String.valueOf(findViewById(R.id.day)));




    private final long finalDay = new GregorianCalendar(2020, 7, 27).getTimeInMillis();
    private final long DAYS = 1000 * 60  * 60 * 24;


    private void updateDayGui (){


        TextView remainingDaysTextView = (TextView) findViewById(R.id.editTextNumberSigned);
        long remainingDays = (finalDay - System.currentTimeMillis()) / DAYS;
        remainingDaysTextView.setText(remainingDays + "");




    }


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


        updateDayGui();


        editText1 = (EditText) findViewById(R.id.input);
        editText2 = (EditText) findViewById(R.id.day);
        editText3 = (EditText) findViewById(R.id.month);
        editText4 = (EditText) findViewById(R.id.year);


        //Shared Prefs Datei öffnen
        SharedPreferences mySPR = getSharedPreferences("MySPFILE",0);


        //Schlüsselwerte aus der Datei in Textfelder
        editText1.setText(mySPR.getString("myKey1","Neu"));
        editText2.setText(mySPR.getString("myKey2","Neu"));
        editText3.setText(mySPR.getString("myKey3","Neu"));
        editText4.setText(mySPR.getString("myKey4","Neu"));
    }


    @Override
    protected void onStop() {
        super.onStop();
        SharedPreferences mySPR = getSharedPreferences("MySPFILE" , 0);
        SharedPreferences.Editor editor = mySPR.edit();
        editor.putString("myKey1",editText1.getText().toString());
        editor.putString("myKey2",editText2.getText().toString());
        editor.putString("myKey3",editText3.getText().toString());
        editor.putString("myKey4",editText4.getText().toString());
        editor.commit();


    }