DDM 20211110

package com.joythis.android.distanceindays;

import java.util.Calendar;

public class AmCalendar {
    private Calendar mCalendar;
    private int mYear; //2021
    private int mMonth; //11
    private int mDay; //10

    private int mAbsDayInYear;
    private int mDayOfWeek;

    /*
    constructs an AmCalendar object
    corresponding to the current date
    default constructor - the constructor without
    arguments
     */
    public AmCalendar(){
        this.mCalendar = Calendar.getInstance();
        this.mYear = this.mCalendar.get(Calendar.YEAR);
        this.mMonth = 1+this.mCalendar.get(Calendar.MONTH);
        this.mDay = this.mCalendar.get(Calendar.DATE);
        this.mAbsDayInYear =
            this.mCalendar.get(Calendar.DAY_OF_YEAR);
        this.mDayOfWeek =
            this.mCalendar.get(Calendar.DAY_OF_WEEK);
    }//AmCalendar

    public AmCalendar(
        int pYear,
        int pMonth,
        int pDay
    ){
        pMonth-=1;
        this.mCalendar = Calendar.getInstance();
        this.mCalendar.clear();
        this.mCalendar.set(
            Calendar.YEAR,
            pYear
        );
        this.mCalendar.set(
            Calendar.MONTH,
            pMonth
        );
        this.mCalendar.set(
            Calendar.DATE,
            pDay
        );
        this.mYear = pYear;
        this.mMonth = pMonth;
        this.mDay = pDay;
        this.mAbsDayInYear = this.mCalendar.get(
            Calendar.DAY_OF_YEAR
        );
        this.mDayOfWeek = this.mCalendar.get(
            Calendar.DAY_OF_WEEK
        );
    }//AmCalendar
    /*
    computes the distance, in days,
    relatively to the device's current date
     */
    public int distanceInDays(){
        return 0;
    }//distanceInDays

    /*
    computes the distance, in days, relatively
    to a given date (as a Calendar object)
     */
    public int distanceInDays(Calendar pC){
        return 0;
    }//distanceInDays

    public String toString(){
        String strRet = "";

        strRet = String.format(
            "%d-%d-%d abs: %d dow: %d",
            this.mYear,
            this.mMonth,
            this.mDay,
            this.mAbsDayInYear,
            this.mDayOfWeek
        );

        return strRet;
    }//toString
}//AmCalendar

****

package com.joythis.android.distanceindays;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    TextView mTvResults;
    AmCalendar mCalendar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rl_distance_in_days_v1);

        init();
    }//onCreate

    void init(){
        mTvResults = findViewById(R.id.idTvResults);

        //this.mCalendar = new AmCalendar();
        this.mCalendar = new AmCalendar(
            2021,
            11,
            7
        );
        String strTheCalendarAsString =
            mCalendar.toString();
        mTvResults.setText(strTheCalendarAsString);
    }//init
}//MainActivity