app/src/main/java/net/ktnx/mobileledger/DatePickerFragment.java

   1 package net.ktnx.mobileledger;
   2
   3 import android.annotation.TargetApi;
   4 import android.app.DatePickerDialog;
   5 import android.app.Dialog;
   6 import android.os.Build;
   7 import android.os.Bundle;
   8 import android.support.annotation.NonNull;
   9 import android.support.v7.app.AppCompatDialogFragment;
  10 import android.widget.DatePicker;
  11 import android.widget.TextView;
  12
  13 import java.util.Calendar;
  14 import java.util.GregorianCalendar;
  15 import java.util.Locale;
  16 import java.util.Objects;
  17 import java.util.regex.Matcher;
  18 import java.util.regex.Pattern;
  19
  20 public class DatePickerFragment extends AppCompatDialogFragment
  21 implements DatePickerDialog.OnDateSetListener, DatePicker.OnDateChangedListener
  22 {
  23     @NonNull
  24     @Override
  25     public Dialog onCreateDialog(Bundle savedInstanceState) {
  26         final Calendar c = GregorianCalendar.getInstance();
  27         int year = c.get(GregorianCalendar.YEAR);
  28         int month = c.get(GregorianCalendar.MONTH);
  29         int day = c.get(GregorianCalendar.DAY_OF_MONTH);
  30         TextView date = Objects.requireNonNull(getActivity()).findViewById(R.id.new_transaction_date);
  31
  32         CharSequence present = date.getText();
  33
  34         Pattern re_mon_day = Pattern.compile("^\\s*(\\d+)\\s*/\\s*(\\d+)\\s*$");
  35         Matcher m_mon_day = re_mon_day.matcher(present);
  36
  37         if (m_mon_day.matches()) {
  38             month = Integer.parseInt(m_mon_day.group(1))-1;
  39             day = Integer.parseInt(m_mon_day.group(2));
  40         }
  41         else {
  42             Pattern re_day = Pattern.compile("^\\s*(\\d{1,2})\\s*$");
  43             Matcher m_day = re_day.matcher(present);
  44             if (m_day.matches()) {
  45                 day = Integer.parseInt(m_day.group(1));
  46             }
  47         }
  48
  49         DatePickerDialog dpd =  new DatePickerDialog(Objects.requireNonNull(getActivity()), this, year, month, day);
  50
  51         // quicker date selection available in API 26
  52         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
  53             DatePicker dp = dpd.getDatePicker();
  54             dp.setOnDateChangedListener(this);
  55         }
  56
  57         return dpd;
  58     }
  59
  60     @TargetApi(Build.VERSION_CODES.O)
  61     public void onDateSet(DatePicker view, int year, int month, int day) {
  62         TextView date = Objects.requireNonNull(getActivity()).findViewById(R.id.new_transaction_date);
  63
  64         final Calendar c = GregorianCalendar.getInstance();
  65         if ( c.get(GregorianCalendar.YEAR) == year && c.get(GregorianCalendar.MONTH) == month) {
  66             date.setText(String.format(Locale.US, "%d", day));
  67         }
  68         else {
  69             date.setText(String.format(Locale.US, "%d/%d", month+1, day));
  70         }
  71     }
  72
  73     @Override
  74     public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
  75         TextView date = Objects.requireNonNull(getActivity()).findViewById(R.id.new_transaction_date);
  76
  77         final Calendar c = GregorianCalendar.getInstance();
  78         if ( c.get(GregorianCalendar.YEAR) == year && c.get(GregorianCalendar.MONTH) == monthOfYear) {
  79             date.setText(String.format(Locale.US, "%d", dayOfMonth));
  80         }
  81         else {
  82             date.setText(String.format(Locale.US, "%d/%d", monthOfYear+1, dayOfMonth));
  83         }
  84
  85         this.dismiss();
  86     }
  87 }