Android AlarmManager 只重复一次

Question

我正在尝试使用AlarmManager 和服务来向某个号码发送自动短信。我遵循了一些教程，并写了如下内容：

        SwitchPreference testPref = (SwitchPreference) findPreference("key_auto_sms");
        SharedPreferences sharedPrefs = getActivity().getSharedPreferences("XXXXXXXXX", MODE_PRIVATE);
        testPref.setChecked(sharedPrefs.getBoolean("AutoSMS", false));

        testPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
            @Override
            public boolean onPreferenceClick(Preference preference) {
                if (testPref.isChecked()) {

                    Calendar calendar = Calendar.getInstance();
                    calendar.setTimeInMillis(System.currentTimeMillis());
                    int curHr = calendar.get(Calendar.HOUR_OF_DAY);
                    // Checking whether current hour is over 14
                    if (curHr >= 15)
                    {
                        // Since current hour is over 15, setting the date to the next day
                        calendar.add(Calendar.DATE, 1);
                    }


                    calendar.set(Calendar.HOUR_OF_DAY, 15);
                    calendar.set(Calendar.MINUTE, 1);
                    calendar.set(Calendar.SECOND, 00);


                    AlarmManager am = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
                    Intent i = new Intent(getActivity(), AlarmReceiver.class);
                    final PendingIntent pi = PendingIntent.getBroadcast(getActivity(), 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
                    am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pi);


                    SharedPreferences.Editor editor = getActivity().getSharedPreferences("XXXXXXXXX", MODE_PRIVATE).edit();
                    editor.putBoolean("AutoSMS", true);
                    editor.commit();
                    Toast.makeText(getActivity(), getResources().getString(R.string.Auto_SMS_Enable), Toast.LENGTH_SHORT).show();


                } else {

                    SharedPreferences.Editor editor = getActivity().getSharedPreferences("com.camel.work_list", MODE_PRIVATE).edit();
                    editor.putBoolean("AutoSMS", false);
                    editor.commit();
                    Toast.makeText(getActivity(), getResources().getString(R.string.Auto_SMS_Cancle), Toast.LENGTH_SHORT).show();

                    Intent intent1 = new Intent(getActivity(), AlarmReceiver.class);
                    final PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, intent1, PendingIntent.FLAG_CANCEL_CURRENT);
                    AlarmManager alarm = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
                    alarm.cancel(pendingIntent);
                    //getActivity().stopService(intent1);
                }
                return false;
            }
        });
    }

我的广播接收器：

    public class AlarmReceiver extends BroadcastReceiver {

      @Override
      public void onReceive(Context context, Intent intent) {
       // MY auto sms method.....
      }
    }

所以问题是闹钟只会工作一次，然后第二天就会停止。

我错过了什么？

Answer 1

您不应使用 setRepeating()，因为它在时间间隔上不准确。您可以一次使用 set() 函数，它会更准确地工作，当广播被调用时，您可以再次调用 set()（如递归），它会起作用。 这是我的闹钟设置代码，它不适用于像华为这样的设备，因为进程会被杀死。对于华为，我使用 JobScheduler。如果屏幕关闭时屏幕很亮，它可以正常工作。它不能正常工作。最近有一个 WorkManager 库，对所有设备都运行得更好，我没有时间研究它，所以我对 WorkManager 库没有任何建议。希望对你有帮助

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            assert alarmManager != null;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                alarmManager.setAlarmClock(new AlarmManager.AlarmClockInfo(time, pendingIntent), pendingIntent);
            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                alarmManager.setExact(AlarmManager.RTC_WAKEUP, time, pendingIntent);
            } else {
                alarmManager.set(AlarmManager.RTC_WAKEUP, time, pendingIntent);
            }