java - Android 闹钟管理器设置在特定时间重复

Question

我在 Android 中遇到了警报管理器的问题。所以我想做的是将闹钟设置为在每天凌晨 12 点左右重复运行数据库插入。

Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 0 );
    calendar.set(Calendar.MINUTE, 1);
        notificationCount = notificationCount + 1;
        AlarmManager mgr = (AlarmManager) context
                .getSystemService(Context.ALARM_SERVICE);
        Intent notificationIntent = new Intent(context,
                ReminderAlarm.class);

        notificationIntent.putExtra("NotifyCount", notificationCount);
        PendingIntent pi = PendingIntent.getBroadcast(context,
                notificationCount, notificationIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);
        mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
                calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pi);

基本上我已经想出了这些代码。但是，警报管理器在我设置后再次执行。

假设我在 2014 年 1 月 10 日下午 5 点 48 分运行应用程序。我希望它在每天凌晨 12 点左右设置 onReceive 时运行数据库插入。但不知何故，警报管理器在 01/10/2014 下午 5 点 49 分执行，这是我设置后一分钟，它停止工作。

我想知道我哪里做错了。

提前致谢。

编辑

复习课对于这个类，它会每天触发警报管理器并将变量传递给提醒警报类以进行数据库插入。

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recurring);
    context = this;
    buildListView();
    if(!alarmInitialized(this)) { 
        scheduleAlarms(this); 
    }
}

// And the few methods you suggested to schedule the alarm
public static void scheduleAlarms(Context context) {
    Calendar calendar = Calendar.getInstance();
    if (hasRunnedToday(context)) { // if the alarm has run this day
        calendar.add(Calendar.DATE, 1); // schedule it to run again starting
                                        // tomorrow
    }

    long firstRunTime = calendar.getTimeInMillis();
    AlarmManager mgr = (AlarmManager) context
            .getSystemService(Context.ALARM_SERVICE);
    Intent notificationIntent = new Intent(context, ReminderAlarm.class);
    PendingIntent pi = PendingIntent.getActivity(context, 0,
            notificationIntent, 0);
    mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, firstRunTime,
            AlarmManager.INTERVAL_DAY, pi);

    ComponentName receiver = new ComponentName(context, BootReceiver.class);
    PackageManager pm = context.getPackageManager();

    pm.setComponentEnabledSetting(receiver,
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP);
}

BootReceiver 类

public void onReceive(Context context, Intent i) {
    if (i.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
        Recurring.scheduleAlarms(context);
    }
}

ReminderAlarm 类基本上对于这个类，它只是获取从 Recurring 类传递的变量并执行数据库插入。我确实插入了一些 Toast.makeText 来测试它是否正在检索，但通过测试没有成功。

public class ReminderAlarm extends BroadcastReceiver {
private NotificationManager mNotificationManager;
private Notification notification;

@Override
public void onReceive(Context context, Intent intent) {
    String recurID = null;
    String recurStartDate = null;
    String currentDate = null;
    String description = null;
    String type = null;
    String amount = null;
    String categoryName = null;
    String frequencyStr = null;
    String nextPaymentDate = null;
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");

    DatabaseAdapter mDbHelper = new DatabaseAdapter(context);
    mDbHelper.createDatabase();
    mDbHelper.open();
    RecurringController rc = new RecurringController(mDbHelper.open());
    ArrayList<RecurringModel> recur_list = rc.getAllRecurring();

    // THIS PART TO GET DATA FROM DATABASE
    for (int i = 0; i < recur_list.size(); i++) {
        recurID = recur_list.get(i).getRecurringID();
        recurStartDate = recur_list.get(i).getRecurringStartDate();
        currentDate = dateFormat.format(new Date());
        description = recur_list.get(i).getRecurringDesc();
        type = recur_list.get(i).getRecurringType();
        amount = Float.toString(recur_list.get(i).getRecurringAmount());
        categoryName = recur_list.get(i).getCategoryID();
        frequencyStr = recur_list.get(i).getFrequency();

        Toast.makeText(context,
                    description, Toast.LENGTH_LONG)
                    .show();
        Toast.makeText(context,
                    recurStartDate Toast.LENGTH_LONG)
                    .show();

        Calendar cal = Calendar.getInstance();
        try {
            cal.setTime(dateFormat.parse(recurStartDate));
            if (frequencyStr.equals("Daily")) {
                cal.add(Calendar.DAY_OF_MONTH, 1);
                nextPaymentDate = dateFormat.format(cal.getTimeInMillis());
                cal.add(Calendar.DAY_OF_MONTH, -1);
            } else if (frequencyStr.equals("Weekly")) {
                cal.add(Calendar.WEEK_OF_YEAR, 1);
                nextPaymentDate = dateFormat.format(cal.getTimeInMillis());
                cal.add(Calendar.WEEK_OF_YEAR, -1);
            } else if (frequencyStr.equals("Monthly")) {
                cal.add(Calendar.MONTH, 1);
                nextPaymentDate = dateFormat.format(cal.getTimeInMillis());
                cal.add(Calendar.MONTH, -1);
            } else if (frequencyStr.equals("Yearly")) {
                cal.add(Calendar.YEAR, 1);
                nextPaymentDate = dateFormat.format(cal.getTimeInMillis());
                cal.add(Calendar.YEAR, -1);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }

        // If dates match then execute the SQL statements
        if (currentDate.equals(nextPaymentDate)) {
            // mDbHelper.createDatabase();
            // mDbHelper.open();
            TransactionRecModel trm = new TransactionRecModel();
            CategoryController cc = new CategoryController(mDbHelper.open());

            trm.setDate(currentDate);
            trm.setTransDescription(description);
            trm.setType(type);
            trm.setAmount(Float.parseFloat(amount));

            // Get the categoryID based on categoryName
            String catID = cc.getCatIDByName(categoryName);
            trm.setCategory(catID);

            // Check if the recurring record exists before insert new
            // transaction record
            boolean recurExist = rc.checkRecurExist(recurStartDate,
                    description, catID);
            if (recurExist == true) {
                TransactionRecController trc = new TransactionRecController(
                        mDbHelper.open());
                // Check if the transaction record exists to prevent
                // duplication
                boolean moveNext = trc.checkTransExist(trm);
                if (moveNext == false) {

                    if (trc.addTransactionRec(trm)) {
                        // Update recurring start date after insertion of
                        // transaction
                        RecurringModel rm = new RecurringModel();
                        rm.setRecurringID(recurID);
                        rm.setRecurringStartDate(currentDate);

                        if (rc.updateRecurringDate(rm)) {
                            mNotificationManager = (NotificationManager) context
                                    .getSystemService(Context.NOTIFICATION_SERVICE);
                            PendingIntent contentIntent = PendingIntent
                                    .getActivity(
                                            context,
                                            Integer.parseInt(intent
                                                    .getExtras()
                                                    .get("NotifyCount")
                                                    .toString()),
                                            new Intent(), 0);
                            notification = new Notification(
                                    R.drawable.ic_launcher, "Notification",
                                    System.currentTimeMillis());
                            notification.setLatestEventInfo(context,
                                    description, nextPaymentDate,
                                    contentIntent);
                            mNotificationManager
                                    .notify(Integer.parseInt(intent
                                            .getExtras().get("NotifyCount")
                                            .toString()), notification);
                            mDbHelper.close();
                        }
                    }
                }
            }
            mDbHelper.close();
        }
    }
    mDbHelper.close();
    Recurring.updateAlarmLastRun(context);
}
}

我已经在你建议的部分添加了这部分代码来安排警报来调用 BootReceiver 类。然后从BootReceiver类回调到Recurring类和Reminder Alarm类:

ComponentName receiver = new ComponentName(context, BootReceiver.class);
    PackageManager pm = context.getPackageManager();

    pm.setComponentEnabledSetting(receiver,
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP);

Answer 1

问题出在calendar.getTimeInMillis()中

mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
            calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pi);

setInexactRepeating 的第二个参数引用了文档

triggerAtMillis time in milliseconds that the alarm should first go off, using the appropriate clock (depending on the alarm type). This is inexact: the alarm will not fire before this time, but there may be a delay of almost an entire alarm interval before the first invocation of the alarm.

这意味着它会在您设置后大约一分钟后第一次运行，因为

calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 0 );
calendar.set(Calendar.MINUTE, 1);

如果您不想在第二天第一次运行闹钟，请执行以下操作calendar.add(Calendar.DATE, 1);`

至于它停止工作，您是否重新启动了设备？AlarmCalendar 警报不会持续到设备重启，您可以注册一个 BroadcastReceiver 以接收 BOOT_COMPLETED 事件并再次注册警报检查 does Alarm Manager persist even after reboot?

更新:正如您所要求的，在检查您的代码后这里有一些帮助

在您的BOOT_COMPLETED Receiver 类中:

public void onReceive(Context context, Intent i) {
    if (i.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
        ReminderAlarm.scheduleAlarms(this);
    }
}

在您的ReminderAlarm 类中

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recurring);

if(!alarmInitialized(this) { 
    scheduleAlarms(this); 
}

public static void scheduleAlarms(Context context) {

    Calendar calendar = Calendar.getInstance();

    if(hasRunnedToday(context)) {       //if the alarm has run this day
        calendar.add(Calendar.DATE, 1); //schedule it to run again starting tomorrow
    }

    long firstRunTime = calendar.getTimeInMillis();

    AlarmManager mgr = (AlarmManager) context
            .getSystemService(Context.ALARM_SERVICE);
    Intent notificationIntent = new Intent(context, ReminderAlarm.class);
    PendingIntent pi = PendingIntent.getActivity(context, 0,
            notificationIntent, 0);

    mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
            firstRunTime, AlarmManager.INTERVAL_DAY, pi);
}

public static boolean alarmInitialized(Context context) {
    SharedPreferences preferences = context.getSharedPreferences("alarm_prefs", MODE_PRIVATE);

    long alarmLastRun = preferences.getLong("AlarmLastRun", -1);


    return alarmLastRun != -1;

}

public static void updateAlarmLastRun(Context context) {
    SharedPreferences preferences = context.getSharedPreferences("alarm_prefs", MODE_PRIVATE);


    preferences.edit()
            .putLong("AlarmLastRun", new Date().getTime())
        .apply();
}

public static boolean hasRunnedToday(Context context) {
    SharedPreferences preferences = context.getSharedPreferences("alarm_prefs", MODE_PRIVATE);

    long alarmLastRun = preferences.getLong("AlarmLastRun", -1);

    if(alarmLastRun == -1) {
        return false;
    }

    //check by comparing day, month and year
    Date now = new Date();
    Date lastRun = new Date(alarmLastRun);


    return now.getTime() - lastRun.getTime() < TimeUnit.DAYS.toMillis(1);
}

每次您的Reminder 类闹钟运行时，您应该调用updateAlarmLastRun 来更新上次闹钟运行的时间，这是必要的，因为闹钟可能会按计划运行在某天，用户在警报运行之前重启设备，在这种情况下我们不希望使用 calendar.add(Calendar.DATE, 1); 因为那样会跳过一天。

在你的Manifest.xml

<receiver android:name=".BootReceiver" android:enabled="true" android:exported="false" android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
     <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
    </receiver>

注意事项:

1. 如果 context 是类字段，则不应执行 context = this，因为对象持有对其字段 context 和 context 的引用字段包含对将泄漏的对象的引用
2. 您的 Receiver 'onReceive` 没有您假设的额外功能，例如设备完成启动时系统发出的“notificationCount”onReceive。
3. 闹钟运行后调用 updateAlarmLastRun

希望对你有帮助