Android闹钟程序周期循环提醒源码(AlarmManager)

来源：互联网发布：猪八戒考试出题软件编辑：程序博客网时间：2024/06/01 15:03

Android系统提供了AlarmManager类来管理闹钟定时提醒任务。通过AlarmManager实现定时提醒及定时循环提醒。那么，AlarmManager类可以应用到以下场景：
1、定时循环启动组件（Component，如Activity、BroadcastReceiver），这样能替代在后台启动Service进行定时提醒任务
2、实现闹钟的按小时、天、周等形式的定时循环提醒功能。

定时启动组件很简单，下面贴出闹钟按天、周形式的定时循环提醒功能的核心代码。此功能核心的是计算出下一次闹钟提醒时间，代码如下：

/* * 闹钟三种设置模式（dateMode）： * 1、DATE_MODE_FIX：指定日期，如20120301   , 参数dateValue格式：2012-03-01 * 2、DATE_MODE_WEEK：按星期提醒，如星期一、星期三 ,  参数dateValue格式：1,3 * 3、DATE_MODE_MONTH：按月提醒，如3月2、3号，4月2、3号,  参数dateValue格式：3,4|2,3 *   * startTime:为当天开始时间，如上午9点, 参数格式为09:00 */public static long getNextAlarmTime(int dateMode, String dateValue,        String startTime) {    final SimpleDateFormat fmt = new SimpleDateFormat();    final Calendar c = Calendar.getInstance();    final long now = System.currentTimeMillis();    // 设置开始时间    try {        if(Task.DATE_MODE_FIX == dateMode) {            fmt.applyPattern("yyyy-MM-dd");            Date d = fmt.parse(dateValue);            c.setTimeInMillis(d.getTime());        }                fmt.applyPattern("HH:mm");        Date d = fmt.parse(startTime);        c.set(Calendar.HOUR_OF_DAY, d.getHours());        c.set(Calendar.MINUTE, d.getMinutes());        c.set(Calendar.SECOND, 0);        c.set(Calendar.MILLISECOND, 0);    } catch (Exception e) {        e.printStackTrace();    }    long nextTime = 0;    if (Task.DATE_MODE_FIX == dateMode) { // 按指定日期        nextTime = c.getTimeInMillis();        // 指定日期已过        if (now >= nextTime) nextTime = 0;    } else if (Task.DATE_MODE_WEEK == dateMode) { // 按周        final long[] checkedWeeks = parseDateWeeks(dateValue);        if (null != checkedWeeks) {            for (long week : checkedWeeks) {                c.set(Calendar.DAY_OF_WEEK, (int) (week + 1));                long triggerAtTime = c.getTimeInMillis();                if (triggerAtTime <= now) { // 下周                    triggerAtTime += AlarmManager.INTERVAL_DAY * 7;                }                // 保存最近闹钟时间                if (0 == nextTime) {                    nextTime = triggerAtTime;                } else {                    nextTime = Math.min(triggerAtTime, nextTime);                }            }        }    } else if (Task.DATE_MODE_MONTH == dateMode) { // 按月        final long[][] items = parseDateMonthsAndDays(dateValue);        final long[] checkedMonths = items[0];        final long[] checkedDays = items[1];        if (null != checkedDays && null != checkedMonths) {            boolean isAdd = false;            for (long month : checkedMonths) {                c.set(Calendar.MONTH, (int) (month - 1));                for (long day : checkedDays) {                    c.set(Calendar.DAY_OF_MONTH, (int) day);                    long triggerAtTime = c.getTimeInMillis();                    if (triggerAtTime <= now) { // 下一年                        c.add(Calendar.YEAR, 1);                        triggerAtTime = c.getTimeInMillis();                        isAdd = true;                    } else {                        isAdd = false;                    }                    if (isAdd) {                        c.add(Calendar.YEAR, -1);                    }                    // 保存最近闹钟时间                    if (0 == nextTime) {                        nextTime = triggerAtTime;                    } else {                        nextTime = Math.min(triggerAtTime, nextTime);                    }                }            }        }    }    return nextTime;}public static long[] parseDateWeeks(String value) {    long[] weeks = null;    try {        final String[] items = value.split(",");        weeks = new long[items.length];        int i = 0;        for (String s : items) {            weeks[i++] = Long.valueOf(s);        }    } catch (Exception e) {        e.printStackTrace();    }    return weeks;}public static long[][] parseDateMonthsAndDays(String value) {    long[][] values = new long[2][];    try {        final String[] items = value.split("\\|");        final String[] monthStrs = items[0].split(",");        final String[] dayStrs = items[1].split(",");        values[0] = new long[monthStrs.length];        values[1] = new long[dayStrs.length];        int i = 0;        for (String s : monthStrs) {            values[0][i++] = Long.valueOf(s);        }        i = 0;        for (String s : dayStrs) {            values[1][i++] = Long.valueOf(s);        }    } catch (Exception e) {        e.printStackTrace();    }    return values;

http://orgcent.com/android-alarmmanager-source/

0 0