首先,定义两个类:Alarm_Scheduler和Alarm_Receiver,Alarm_Scheduler的代码如下:
public class Alarm_Scheduler {public static void schedule_alarm(Context context) {AlarmManager alarm_manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);Intent intent = new Intent(context, Alarm_Receiver.class);PendingIntent pending_intent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);// 高版本无法setExactAndAllowWhileIdleif (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {if (!alarm_manager.canScheduleExactAlarms()) {try {intent = new Intent(Settings.ACTION_REQUEST_SCHEDULE_EXACT_ALARM);intent.setData(Uri.parse("package:" + context.getPackageName()));context.startActivity(intent);} catch (ActivityNotFoundException e1) {try {// 跳转到应用详情页备选Intent settingsIntent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);settingsIntent.setData(Uri.parse("package:" + context.getPackageName()));context.startActivity(settingsIntent);}catch (ActivityNotFoundException e2) {// 显示手动引导弹窗}}}}// 设置精确唤醒（根据系统版本适配）if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {alarm_manager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,System.currentTimeMillis() + TraceApplication.alarm_interval,pending_intent);}else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {alarm_manager.setExact(AlarmManager.RTC_WAKEUP,System.currentTimeMillis() + TraceApplication.alarm_interval,pending_intent);}else {alarm_manager.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis() + TraceApplication.alarm_interval,pending_intent);} }
首先获得一个AlarmManager的实例,再定义一个PendingIntent启动Alarm_Receiver.
setExactAndAllowWhileIdle是Android中用于设置精确闹钟的方法,它允许在设备处于低功耗模式（如Doze模式）时仍然能够触发闹钟.这种方法特别适用于需要确保在特定时间触发闹钟的应用场景.然而,高版本的Android系统（API版本31及以上）禁止使用这个方法,因此要判断Android系统的版本,对于高版本的系统引导用户进行设置,允许使用setExactAndAllowWhileIdle方法.
然后根据不同的系统版本设置闹钟,API版本23及以上的使用setExactAndAllowWhileIdle(),19~22使用setExact(),18及以下使用set().
