将 12 小时转换为 24 小时 [英] Convert 12 hours to 24 hours

问题描述

如何将12小时hh:mm a转换成HH:mm?当我们转换它时，我们无法进入 24 小时格式.当我们指定晚上 10 点开始时间和早上 7 点起床时间时，这里的时间格式 pm 到 am 没有转换.在这里我们无法获得总时间.它在中午 12:00 停止，而且我们从晚上 10 点到早上 7 点的总时间加倍为 18 小时.当时间从晚上 11:59 更改为上午 00:00 时00:00am" 导致这里出现问题.

How to convert 12 hours hh:mm a into HH:mm? When we converting this we are unable to get into 24 hours format. Here the time format pm to am is not converting when we assigned start time at 10pm and wake up time 7am. Here we are unable to get the total time. It's getting stopped at 12:00am and also we are getting the total time double from 10pm to 7am as 18 hours. when time is changing from 11:59pm to 00:00am "00:00am" is causing the problem here.

public class Wakeup extends Activity {
ImageButton home, back, up_arw2, up_arw1, up_arw3, down_arw4, down_arw5, down_arw6;
TextView hours, minutes, ampm;
Button save_btn;
SharedPreferences timepreference;
SharedPreferences.Editor edittime;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.wakeup_time);
    hours = (TextView) findViewById(R.id.hours);
    minutes = (TextView) findViewById(R.id.minutes);
    ampm = (TextView) findViewById(R.id.ampm);
    home = (ImageButton) findViewById(R.id.home);
    save_btn = (Button) findViewById(R.id.save_btn);
    timepreference = getSharedPreferences("CHILDTIME", MODE_PRIVATE);
    Calendar c = Calendar.getInstance();
    SimpleDateFormat df = new SimpleDateFormat("HH:mm a");
    String formattedTime = df.format(c.getTime());
edittime = timepreference.edit();
    home.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(getApplicationContext(), Settings.class));
        }
    });

    back = (ImageButton) findViewById(R.id.back);
    back.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(getApplicationContext(), Settings.class));
        }
    });
    up_arw2 = (ImageButton) findViewById(R.id.up_arw2);
    up_arw2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int timenum = Integer.parseInt(hours.getText().toString());
            if (timenum == 11) {
                if (ampm.getText().toString().equals("AM")) {
                    ampm.setText("PM");
                    timenum++;
                    hours.setText(String.valueOf(timenum));
                } else {
                    ampm.setText("AM");
                    timenum++;
                    hours.setText(String.valueOf(timenum));
                }
            } else {
                timenum++;
                hours.setText(String.valueOf(timenum));
                down_arw4.setClickable(true);
            }
            if (timenum > 12) {
                hours.setText("1");
            }
        }
    });
    down_arw4 = (ImageButton) findViewById(R.id.down_arw4);
    down_arw4.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int timenum = Integer.parseInt(hours.getText().toString());
            if (timenum == 1) {
                hours.setText("12");
            } else {
                timenum--;
                hours.setText(String.valueOf(timenum));
            }
        }
    });
    up_arw3 = (ImageButton) findViewById(R.id.up_arw3);
    up_arw3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int timenum = Integer.parseInt(minutes.getText().toString());
            if (timenum == 59) {
                minutes.setText("00");
            } else {
                timenum++;
                minutes.setText(roundedmin(String.valueOf(timenum)));
            }
        }
    });
    down_arw5 = (ImageButton) findViewById(R.id.down_arw5);
    down_arw5.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int timenum = Integer.parseInt(minutes.getText().toString());
            if (timenum == 0) {
                minutes.setText("59");
            } else {
                timenum--;
                minutes.setText(roundedmin(String.valueOf(timenum)));
                up_arw3.setClickable(true);
            }
        }
    });
    down_arw6 = (ImageButton) findViewById(R.id.down_arw6);
    down_arw6.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            ampm.setText("PM");
        }
    });
    up_arw1 = (ImageButton) findViewById(R.id.up_arw1);
    up_arw1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            ampm.setText("AM");
        }
    });

    save_btn.setOnClickListener(new View.OnClickListener() {
        Date date;
        long gottimesss,millisecndslong;
        @Override
        public void onClick(View v) {
            SimpleDateFormat displayFormat = new SimpleDateFormat("HH:mm");
            SimpleDateFormat parseFormat = new SimpleDateFormat("hh:mm a");
            try {
                date = parseFormat.parse(hours.getText().toString() + ":" + minutes.getText().toString() + " " + ampm.getText().toString());
                String gottime = displayFormat.format(date);
                String[] timedivided = gottime.split(":");
                String gothr = timedivided[0];
                long gotlong = TimeUnit.HOURS.toMinutes(Long.parseLong(gothr));
                String gotmin = timedivided[1];
                int gotintmin = Integer.parseInt(gotmin);
                gottimesss=gotlong+gotintmin;
                millisecndslong=TimeUnit.MINUTES.toMillis(gottimesss);
                convertSecToHoursMinute(millisecndslong);
                Log.d("GOtssss", String.valueOf(millisecndslong));
                Log.d("timing", "");
            } catch (ParseException e) {
                e.printStackTrace();
            }
 edittime.putLong("savedwakeuptime", millisecndslong);
edittime.commit();
startActivity(new Intent(getApplicationContext(), Home.class));
        }
    });
}
String convertSecToHoursMinute(long Sec) {
    long hours = Sec / 3600;
    long minutes = (Sec % 3600) / 60;
    long seconds = (Sec % 3600) % 60;

    String amPm = "am";
    if (minutes == 60) {
        minutes = 0;
        hours = hours + 1;
    }
    if (hours == 12) {
        amPm = "pm";
    }
    if (hours == 0) {
        hours = 12;
    }
    if (hours > 12) {
        hours = hours - 12;
        amPm = "pm";
    }
    Log.d("Timingdata",setZeroBeforeNine(hours) + ":" + setZeroBeforeNine(minutes) + " " + amPm);
    return setZeroBeforeNine(hours) + ":" + setZeroBeforeNine(minutes) + " " + amPm;
}

public static String setZeroBeforeNine(long digit) {
    try {
        if (digit <= 9) {
            return "0" + digit;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return "" + digit;
}

public static String roundedmin(String min) {
    if (min.length() == 1) {
        min = "0" + min;
    }
    return min;
}
}

推荐答案

使用这两种方法将秒转换为 24 小时格式 public static

Use these two method for convert second to 24hours format public static

String convertSecToHoursMinute(long Sec) {
        long hours = Sec / 3600;
        long minutes = (Sec % 3600) / 60;
        long seconds = (Sec % 3600) % 60;
        String amPm = "am";
        if (minutes == 60) {
            minutes = 0;
            hours = hours + 1;
        }


        if (hours == 12) {
            amPm = "pm";
        }
        if (hours == 0) {
            hours = 12;
        }
        if (hours > 12) {
            hours = hours - 12;
            amPm = "pm";
        }
        return setZeroBeforeNine(hours) + ":" + setZeroBeforeNine(minutes) + " " + amPm;
    }

    /**
     * To set Zero before digits if less than 9(for date and time)
     *
     * @param digit : Date and time before which 0 is placed if less than 9
     * @return :return Digit placing 0 as prefix if digit is less than 9
     */
    public static String setZeroBeforeNine(long digit) {
        try {
            if (digit <= 9) {
                return "0" + digit;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "" + digit;
    }

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