Question

我的MainActivity的OnCreate方法调用了scheduleAlarm方法，我在另一个名为PollReceiver的类中实现了该方法。它的代码如下：

    Intent iWeekly = new Intent(context, ScheduledWeeklyService.class);
    PendingIntent piWeekly = PendingIntent.getBroadcast(context, 0, iWeekly, 0);

    AlarmManager alarmMgrWeekly = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    alarmMgrWeekly.setRepeating(AlarmManager.RTC_WAKEUP, scheduleTime, Constants.PERIOD_WEEKLY, piWeekly);

我的应用程序还有一个togglebutton来启用或禁用警报。

togglebutton代码如下所示：

    public void enableDisableScheduler(View v){
        if (btnEnableDisableScheduler.isChecked()) {
            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(ctx);
            SharedPreferences.Editor editor = prefs.edit();
            editor.putBoolean("toggleButton", tb.isChecked()); 
            editor.commit();        

            // Enable all alarms
            PollReceiver.scheduleAlarms(this);

            Log.i(TAG, "alarm is turned on");
        } else {
            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(ctx);
            SharedPreferences.Editor editor = prefs.edit();
            editor.putBoolean("toggleButton", tb.isChecked()); 
            editor.commit();        

            // Cancel all alarms
            Intent iWeekly = new Intent(context, ScheduledWeeklyService.class);
            PendingIntent piWeekly = PendingIntent.getBroadcast(context, 0, iWeekly, 0);

            AlarmManager alarmMgrWeekly = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            try {
                alarmMgrWeekly.cancel(piWeekly);
            } catch (Exception e) {
                Log.e(TAG, "alarm is not cancelled");
            }

            Log.i(TAG, "alarm is turned off");
        }
    }

现在，一切正常。所以，当我退出app＆amp;重新打开它，上面的代码再次被解雇＆amp;它重新安排了那些效果很好的警报。

我试图通过放下代码来避免重新安排警报，但它不起作用。非常感谢任何想法或帮助。如果我关闭切换按钮＆amp;把它打开警报没有按计划进行，因为不知何故它不满足以下条件＆amp;如果条件不符合以下条件。任何线索或想法如何做到这一点？

boolean weeklyAlarmUp = (PendingIntent.getBroadcast(context, 0, new Intent(context, ScheduledWeeklyService.class), PendingIntent.FLAG_NO_CREATE) != null);

if (!weeklyAlarmUp) {
    Intent iWeekly = new Intent(context, ScheduledWeeklyService.class);
    PendingIntent piWeekly = PendingIntent.getBroadcast(context, 0, iWeekly, 0);

    AlarmManager alarmMgrWeekly = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    alarmMgrWeekly.setRepeating(AlarmManager.RTC_WAKEUP, scheduleTime, Constants.PERIOD_WEEKLY, piWeekly);
}

Answer 1

此代码用于检查警报是否已安排：

boolean weeklyAlarmUp = (PendingIntent.getBroadcast(context, 0, new Intent(context,
           ScheduledWeeklyService.class), PendingIntent.FLAG_NO_CREATE) != null);

不起作用，因为您依赖PendingIntent的现有内容。当您取消闹钟时，即使闹钟已被取消，您也不会取消PendingIntent，因此它仍然存在。

要解决此问题，请确保在取消闹钟时取消PendingIntent，如下所示：

// cancel alarm
alarmMgrWeekly.cancel(piWeekly);
// Cancel PendingIntent
piWeekly.cancel();

通过toggleButton取消后闹钟无法启动

1 个答案: