根据输入的日期和时间选择器计算结束时间

Question

我正在尝试根据用户从选择器中选择的日期和时间创建结束时间。有没有人知道这是否可以计算或使用从选择器中选择的日期和时间？

这是已尝试的代码..它目前获取的当前日期和时间不是用户从选择器中选择的。

以下是采摘者：

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.create_line);
    myDb = new DatabaseHelper(this);

    quantity = (TextView) findViewById(R.id.editText3);
    duration = (TextView) findViewById(R.id.durationtextView);
    dateButton = (Button) findViewById(R.id.angry_btn);
    VerifyButton = (Button) findViewById(R.id.confirmButton);
    tv = (Button) findViewById(R.id.buttonddate);

    mCurrentDate = Calendar.getInstance();

    day = mCurrentDate.get(Calendar.DAY_OF_MONTH);
    month = mCurrentDate.get(Calendar.MONTH);
    year = mCurrentDate.get(Calendar.YEAR);



    tv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            DatePickerDialog datePickerDialog = new DatePickerDialog(CreateLine.this, new DatePickerDialog.OnDateSetListener() {

                @Override
                public void onDateSet(DatePicker datePicker, int year, int monthOfYear, int dayOfMonth) {

                    monthOfYear = monthOfYear +1;
                    String Sd = String.valueOf(dayOfMonth + "/" + monthOfYear + "/" + year);
                    tv.setText(Sd);

                }
            }, year, month, day);
            datePickerDialog.show();

        }
    });

    display = (Button) findViewById(R.id.button_displayTPD);
    Button displayTDPButton = (Button) findViewById(R.id.button_displayTPD);
    displayTDPButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            new TimePickerDialog(CreateLine.this, onTimeSetListener, calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), true).show();
        }

        TimePickerDialog.OnTimeSetListener onTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                String St = String.valueOf(hourOfDay + ":" + minute);
                display.setText(St);
            }
        };

这是结束时间的计算

   dateButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    dateButton.setText(date.toString());

                    // Creates an instance of current DateTime which represents the
                    // current date time.
                    //DateTime dateTime = new DateTime();
                    DateTime dateTime = new DateTime(year, month, day, 12, 0, 0, 11);

                    DateTimeFormatter fmt = DateTimeFormat.forPattern("E d MMM yyyy" + "\n" + " h:mm a ");
                    String formattedtime = fmt.print(dateTime);
                    dateButton.setText(formattedtime);

                    // Plus some hours, minutes, and seconds to the original DateTime.
                    DateTimeFormatter fmt2 = DateTimeFormat.forPattern("E d MMM yyyy" + "\n" + " h:mm a ");

                    DateTime dateTime1 = dateTime.plusHours(timeadded);
                    String endtimecalc = fmt2.print(dateTime1);
                    TextView endtime = (TextView) findViewById(endtimetextView);
                    endtime.setText(endtimecalc);


                }
            });


            VerifyButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View view) {


                    String spinnerSelection = String.valueOf(spinner.getSelectedItem());
                    String spinnerSelection2 = String.valueOf(spinner2.getSelectedItem());
                    String q = quantity.getText().toString();
                    String d = duration.getText().toString();

                    DateTime dateTime = new DateTime();
                    DateTimeFormatter fmt = DateTimeFormat.forPattern("E d MMM yyyy" + "\n" + " h:mm a ");
                    String formattedtime = fmt.print(dateTime);
                    dateButton.setText(formattedtime);

                    // Plus some hours, minutes, and seconds to the original DateTime.
                    DateTimeFormatter fmt2 = DateTimeFormat.forPattern("E d MMM yyyy" + "\n" + " h:mm a ");

                    DateTime dateTime1 = dateTime.plusHours(timeadded);
                    String endtimecalc = fmt2.print(dateTime1);
                    TextView endtime = (TextView) findViewById(endtimetextView);
                    endtime.setText(endtimecalc);

这是预期结果'endtime'的屏幕截图。结果是拣货员选择的日期和时间加上小时的持续时间应该=结束时间

Answer 1

首先将日期转换为毫秒日期，然后计算时间

Date startDate = // Set start date
Date endDate   = // Set end date

long duration  = endDate.getTime() - startDate.getTime();

long diffInSeconds = TimeUnit.MILLISECONDS.toSeconds(duration);
long diffInMinutes = TimeUnit.MILLISECONDS.toMinutes(duration);
long diffInHours = TimeUnit.MILLISECONDS.toHours(duration);