I'm developing application that in one of its activity has the mechanism that calculates workdays between two dates:
package com.example.salary;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Toast;
public class CountingWorkDays extends Activity {
static Calendar start_calendar = Calendar.getInstance();
static Calendar end_calendar = Calendar.getInstance();
EditText et_start;
EditText et_end;
Button count;
Button save_days;
static int workDays = 0;
static int totalDays = 0;
int dni_robocze = 0;
Calendar start_calendar_save = Calendar.getInstance();
Calendar end_calendar_save = Calendar.getInstance();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.przeliczanie_dni_roboczych);
gather_start_date();
gather_end_date();
after_clicking_count();
after_clicking_save();
}
private void update_et(EditText edittext, Calendar myCalendar) { //inserting to EditText object
String myFormat = "dd/MM/yy";
SimpleDateFormat date = new SimpleDateFormat(myFormat, Locale.UK);
edittext.setText(date.format(myCalendar.getTime()));
}
public void gather_start_date() { //getting start date
et_start = (EditText) findViewById(R.id.et_od);
final DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
start_calendar.set(Calendar.YEAR, year);
start_calendar.set(Calendar.MONTH, monthOfYear);
start_calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
update_et(et_start, start_calendar);
}
};
et_start.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new DatePickerDialog(PrzeliczanieDniRoboczych.this, date,
start_calendar.get(Calendar.YEAR), start_calendar
.get(Calendar.MONTH), start_calendar
.get(Calendar.DAY_OF_MONTH)).show();
}
});
}
public void gather_end_date() { //getting end date
et_end = (EditText) findViewById(R.id.et_do);
final DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
end_calendar.set(Calendar.YEAR, year);
end_calendar.set(Calendar.MONTH, monthOfYear);
end_calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
update_et(et_end, end_calendar);
}
};
et_end.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new DatePickerDialog(PrzeliczanieDniRoboczych.this, date,
end_calendar.get(Calendar.YEAR), end_calendar
.get(Calendar.MONTH), end_calendar
.get(Calendar.DAY_OF_MONTH)).show();
}
});
}
public void after_clicking_count() { //after clicking "Calculate"
work_days = 0;
count = (Button) findViewById(R.id.b_count_workdays);
count.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
work_days = getWorkingDaysBetweenTwoDates();
}
});
}
public int getWorkingDaysBetweenTwoDates() { //getting working days between two dates
workDays = 0;
totalDays = 0;
// Return 0 if start and end are the same
if (et_start.getText().toString().trim().length() == 0
|| et_end.getText().toString().trim().length() == 0
|| et_start.getText().toString().matches("dd/mm/yy")
|| et_end.getText().toString().matches("dd/mm/yy")) {
Toast.makeText(getApplicationContext(), "Choose dates!",
Toast.LENGTH_SHORT).show();
return 0;
} else {
if (start_calendar.getTimeInMillis() > end_calendar
.getTimeInMillis()) {
Toast.makeText(PrzeliczanieDniRoboczych.this,
"Start date has to be before end date",
Toast.LENGTH_SHORT).show();
} else {
for (; start_calendar.getTimeInMillis() <= end_calendar
.getTimeInMillis(); start_calendar.add(
Calendar.DAY_OF_MONTH, 1)) {
totalDays++;
if (start_calendar.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY
&& start_calendar.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY) {
workDays++;
}
}
start_calendar.add(Calendar.DAY_OF_MONTH, -1 * totalDays);
Toast.makeText(PrzeliczanieDniRoboczych.this,
"Workday is this period are: " + workDays,
Toast.LENGTH_SHORT).show();
}
return workDays;
}
}
I would like to add the mechanism that will allow user to insert dates of holidays (this aplication will calculate the salary and holidays means no salary, so it's important).
As I saw here, user SimplyPanda suggested adding an ArrayList<Integer> to do so. However, I wondering how the inserting by user should look like.
Should user know the integer representation of particular dates in Java? - I guess no.
Does anyone have any idea how to implement such functionality?
