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Android闹钟程序周期循环提醒源码(AlarmManager)
来源:互联网   发布日期:2015-09-29 10:01:45   浏览:3344次  

导读: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...

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 www.2cto.com

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;

}

如果在闹钟响起后,若没有关闭闹钟,还需每隔几分钟再次提醒,可以使用AlarmManager的setRepeating()方法,否则使用set()即可。闹钟程序还会用到屏幕解锁相关,具体查看Android屏幕点亮(常亮)及屏幕解锁和锁定

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