android - 如何根据日期变化计算两个时间字段之间的时间差

Question

我想计算时差。我有三个 EditTexts ，我想在前两个 edittexts 中以 HH:MM 格式输入时间。然后计算时间差，结果将以相同的格式显示在第三个编辑文本字段中。如果日期发生变化，则按时差计算，即

如果第一次 = 23:00 第二次 = 01:00

那么，时差=02:00

public class TimeCalculate extends Activity {

    private String mBlock;
    private String mBlockoff;
    private String mBlockon ;

    // String mHours, mMinutes;

    Date date1, date2;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        EditText blockoff = (EditText) findViewById(R.id.blockoff);
        mBlockoff = blockoff.getText().toString();

        EditText blockon = (EditText) findViewById(R.id.blockon);
        mBlockon = blockon.getText().toString();

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm");

        try {
            date1 = simpleDateFormat.parse(mBlockoff);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            date2 = simpleDateFormat.parse(mBlockon);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        mBlock = getDifference(date1, date2);
        EditText block = (EditText) findViewById(R.id.block);
        block.setText(mBlock.toString());

    }
public static String getDifference(Date startTime, Date endTime) {

        if (startTime == null)
            return "corrupted";
        Calendar startDateTime = Calendar.getInstance();
        startDateTime.setTime(startTime);
        Calendar endDateTime = Calendar.getInstance();
        endDateTime.setTime(endTime);
        long milliseconds1 = startDateTime.getTimeInMillis();
        long milliseconds2 = endDateTime.getTimeInMillis();
        long diff = milliseconds2 - milliseconds1;
        /*int hours = (int)diff / (60 * 60 * 1000);
        int minutes = (int) (diff / (60 * 1000)); minutes = minutes - 60 * hours;
        long seconds = diff / (1000); */
        //timeDiff = DateUtils.formatElapsedTime(seconds);

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:MM");
        Date date = new Date(diff);
        return simpleDateFormat.format(date);

    }

}

我执行了这段代码，但给出了错误，因为找不到源。我认为 getDifference 方法有错误。请给出任何其他逻辑

Answer 1

时差由以下代码计算:

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);

编辑:

date1 和 date2 是 Date 对象，如果你有 EditText 那么你可以使用下面的代码将你的文本转换成 Date 对象，

  DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy"); // Make sure user insert date into edittext in this format.
     Date dateObject;

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

    }