无法显示我的 Textview1 和 Textview2 之间的计算时间差？

Question

this is the screenshot of my application the Time in which is 00:57:18 and the timeout 14:14:21 should be automatically calculated the time difference and the result will show in Total travel hours (circled with red)

What do you think I need to change in my codings to make the output show properly in Total Hours Difference Thank you so much.

this is the code of mine.

FormTimeOut.java

    String date_n = new SimpleDateFormat("MM/dd/yyyy", 
Locale.getDefault()).format(new Date());
    TextView date  = (TextView) findViewById(R.id.editText_timei_timedate);
    date.setText(date_n);


    DisplayDateTime = (TextView) findViewById(R.id.editText_timei_out);
    DisplayDateTimeStart = (TextView) 
findViewById(R.id.editText_travel_start);
    DisplayDateTimeTotal = (TextView) 
findViewById(R.id.editText_travel_total);


    BTN = (Button) findViewById(R.id.button1);

    calander = Calendar.getInstance();
    simpledateformat = new SimpleDateFormat("HH:mm:ss");
    Date = simpledateformat.format(calander.getTime());
    simpledateformat2 = new SimpleDateFormat("HH:mm:ss");
    Date2 = simpledateformat2.format(calander.getTime());

    BTN.setOnClickListener(new View.OnClickListener()

    {

        @Override
        public void onClick (View v){

            DisplayDateTime.setText(Date);
            DisplayDateTimeStart.setText(Date2);

            try {

                Date oldDate = (java.util.Date) 
 simpledateformat2.parse(String.valueOf(simpledateformat));


                Date currentDate = new Date();

                long diff = currentDate.getTime() - oldDate.getTime();
                long seconds = diff / 1000;
                long minutes = seconds / 60;
                long hours = minutes / 60;

                if (oldDate.before(currentDate)) {

                    DisplayDateTimeTotal.setText("hours:" + hours + "minutes:" + minutes);

                }

                // Log.e("toyBornTime", "" + toyBornTime);

            } catch (ParseException e) {

                e.printStackTrace();
            }


        }
    });

Answer 1

I think what you need is to show the time difference in the below text view. Hope the below code helps to clear your doubt.

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm:ss");

date1 = simpleDateFormat.parse("00:57:18");
date2 = simpleDateFormat.parse("14:14:21");

long difference = date2.getTime() - date1.getTime();
hours = (int) ((difference - (1000*60*60)); 
min = (int) (difference - (1000*60*60*hours)) / (1000*60);
sec = (int) (difference - (1000*60*60*hours)) - (1000*60*min)) / (1000);
hours = (hours < 0 ? -hours : hours);
String totalTime = String.valueOf(hours) + ":" + String.valueOf(min) + ":" + String.valueOf(sec);
DisplayDateTimeTotal.setText(totalTime);

Answer 2

For time calculate I have used this:

long difference = date2.getTime() - date1.getTime(); 
days = (int) (difference / (1000*60*60*24));  
hours = (int) ((difference - (1000*60*60*24*days)) / (1000*60*60)); 
min = (int) (difference - (1000*60*60*24*days) - (1000*60*60*hours)) / (1000*60);

you can convert your text into Date object by using the following code

  DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy"); 
 Date dateObject;

try{
String dob=(tx.getText().toString());
dateObject = formatter.parse(dob);
date = new SimpleDateFormat("dd/MM/yyyy").format(dateObject);

}