Android NEXT_ALARM_FORMATTED 字符串到毫秒

Question

现在我可以在字符串值中获取下一个警报。我想在毫秒内得到它。这是我尝试过的方法，但没有用。我也使用 Locale.US，但希望它适用于任何 Locale。请指教

String nextAlarm = android.provider.Settings.System.getString(getContentResolver(), android.provider.Settings.System.NEXT_ALARM_FORMATTED);

    DateFormat format = new SimpleDateFormat("EEE hh:mm aa", Locale.US);
    long nextAlarmTime = 0;
    try {
        Date date = format.parse(nextAlarm);
        nextAlarmTime = date.getTime();
    } catch (Exception e) {
    }

    long curTime = System.currentTimeMillis();
    long diff = nextAlarmTime - curTime;

    //diff would represent the time in milliseconds

Answer 1

在具有 API 21 及更高版本的设备上，您可以使用 getSystemService() 实现毫秒数:

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
    AlarmManager.AlarmClockInfo info = 
        ((AlarmManager)getSystemService(Context.ALARM_SERVICE)).getNextAlarmClock();
    if (info != null) {
        long alarmTime = info.getTriggerTime();
        SimpleDateFormat simpleDateFormat = 
            new SimpleDateFormat("yyyy-MM-dd hh:mm a", Locale.US);
        Log.d(getClass().getSimpleName(),
            simpleDateFormat.format(new Date(alarmTime)));
    }
}

在旧设备上，您必须在数据库中查找警报字符串:

String nextAlarm = Settings.System.getString(getContentResolver(),
                       Settings.System.NEXT_ALARM_FORMATTED);

检索到的字符串的格式取决于 i.a.在运行设备的区域设置上。字符串由

• 时间的数字(阿拉伯语、印度语、...？)

• 字符串来自

  String[] weekdays = DateFormatSymbols.getInstance().getShortWeekdays();
  

• 字符串来自

  String[] amPm = DateFormatSymbols.getInstance().getAmPmStrings();
  

您不能依赖工作日时间 AmPm 组件的顺序。例如，AmPm-String 并不总是放在末尾。在韩国，它通常放在工作日和时间之间。

---

我的解决方案:

AlarmTimeTool.java:

import java.util.Calendar;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class AlarmTimeTool {

    public static long getNextAlarm(String alarm, String[] weekdays, String[] amPm) {
        int alarmHours = -1, alarmMinutes = -1;
        int alarmWeekday = -1; // Calendar.SUNDAY = 1; Calendar.SATURDAY = 7;
        int alarmAmPm = -1; // Calendar.AM = 0; Calendar.PM = 1;

        for (String piece: alarm.split("\\s")) {
            if (alarmWeekday == -1) {
                alarmWeekday = getWeekday(piece, weekdays);
                if (alarmWeekday != -1) {
                    continue;
                }
            }
            if (alarmHours == -1) {
                int[] hoursMinutes = getTime(piece);
                alarmHours = hoursMinutes[0];
                alarmMinutes = hoursMinutes[1];
                if (alarmHours != -1) {
                    continue;
                }
            }
            if (alarmAmPm == -1) {
                alarmAmPm = getAmPm(piece, amPm);
            }
        }

        if (alarmWeekday == -1 || alarmHours == -1) {
            throw new RuntimeException("could not fetch alarm week or hour");
        }

        Calendar now = Calendar.getInstance();
        Calendar nextAlarm = Calendar.getInstance();
        nextAlarm.set(Calendar.DAY_OF_WEEK, alarmWeekday);
        nextAlarm.set(Calendar.MINUTE, alarmMinutes);
        nextAlarm.set(Calendar.SECOND, 0);
        nextAlarm.set(Calendar.MILLISECOND, 0);
        if (alarmAmPm == -1) {
            nextAlarm.set(Calendar.HOUR_OF_DAY, alarmHours);
        } else {
            nextAlarm.set(Calendar.AM_PM, alarmAmPm);
            nextAlarm.set(Calendar.HOUR, alarmHours % 12);
        }
        if (nextAlarm.before(now)) {
            nextAlarm.add(Calendar.DAY_OF_MONTH, 7);
        }

        return nextAlarm.getTimeInMillis();
    }

    private static int[] getTime(String piece) {
        int hours = -1;
        int minutes = -1;

        // Android only (\d has different meanings):
        Pattern p = Pattern.compile("(\\d{1,2})\\D(\\d{2})");

        Matcher m = p.matcher(piece);
        if (m.find()) {
            hours = Integer.parseInt(m.group(1));
            minutes = Integer.parseInt(m.group(2));
        }
        int[] hoursMinutes = {hours, minutes};
        return hoursMinutes;
    }

    private static int getWeekday(String piece, String[] weekdays) {
        for (int i = 1; i < weekdays.length; i++) {
            if (piece.contains(weekdays[i])) {
                return i;
            }
        }
        return -1;
    }

    private static int getAmPm(String piece, String[] amPm) {
        for (int i = 0; i < amPm.length; i++) {
            if (piece.contains(amPm[i])) {
                return i;
            }
        }
        return -1;
    }
}

MainActivity.java:

import android.app.Activity;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;

import java.text.DateFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;


public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String nextAlarm = Settings.System.getString(getContentResolver(),
                Settings.System.NEXT_ALARM_FORMATTED);
        if (nextAlarm != null && !nextAlarm.isEmpty()) {
            Log.d(getClass().getSimpleName(), nextAlarm);
            String[] weekdays = DateFormatSymbols.getInstance().getShortWeekdays();
            String[] amPm = DateFormatSymbols.getInstance().getAmPmStrings();
            long alarmTime = AlarmTimeTool.getNextAlarm(nextAlarm, weekdays, amPm);
            SimpleDateFormat simpleDateFormat =
                    new SimpleDateFormat("yyyy-MM-dd hh:mm a", Locale.US);
            Log.d(getClass().getSimpleName(), simpleDateFormat.format(new Date(alarmTime)));
        }
    }
}