Android在后台运行SQL语句

Question

我在Android中的闹钟管理器遇到了一些问题。我所遇到的是，当我将闹钟设置为重复的每一分钟，它的工作原理：

mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, 
       calendar.getTimeInMillis(), 60000, pi); 

然而，当我尝试将它设置为每天运行一次的通知，这是行不通的：

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

这是我执行报警管理器的部分。这种方法被称为在的onCreate：

public void buildListView() { 
    // Database part to retrieve the data 

    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("RecurID", recurID);  
     notificationIntent.putExtra("RecurStartDate", recurDate); 
     notificationIntent.putExtra("CurrentDate", dateFormat.format(new Date())); 
     notificationIntent.putExtra("Description", recurDesc); 
     notificationIntent.putExtra("Type", recurType); 
     notificationIntent.putExtra("Amount", formatAmount); 
     notificationIntent.putExtra("CategoryName", categoryName); 
     notificationIntent.putExtra("Frequency", frequency); 
     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); 

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

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

而且从上面的方法，它会调用一个接收器：

public class BootReceiver extends BroadcastReceiver { 
@Override 
public void onReceive(Context context, Intent i) { 
    if (i.getAction().equals("android.intent.action.BOOT_COMPLETED")) { 
     int notificationCount = Integer.parseInt(i.getExtras() 
       .get("NotifyCount").toString()); 
     scheduleAlarms(context,notificationCount); 
    } 
} 

static void scheduleAlarms(Context context, int notificationCount) { 
    Calendar calendar = Calendar.getInstance(); 
    calendar.setTimeInMillis(System.currentTimeMillis()); 
    calendar.set(Calendar.HOUR_OF_DAY, 0); 
    calendar.set(Calendar.MINUTE, 1); 
    AlarmManager mgr = (AlarmManager) context 
      .getSystemService(Context.ALARM_SERVICE); 
    Intent notificationIntent = new Intent(context, ReminderAlarm.class); 
    PendingIntent pi = PendingIntent.getService(context, notificationCount, 
      notificationIntent, 0); 

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

}

然后从bootReceiver类，它会调用alarmReminder类做SQL语句和提示通知：

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

@Override 
public void onReceive(Context context, Intent intent) { 
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy"); 
    //Getting all the data from extras 

    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); 
     } 
    } catch (ParseException e) { 
     e.printStackTrace(); 
    } 

    // If dates match then execute the SQL statements 
    if (currentDate.equals(nextPaymentDate)) { 
     DatabaseAdapter mDbHelper = new DatabaseAdapter(
       context.getApplicationContext()); 
     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 
     RecurringController rc1 = new RecurringController(mDbHelper.open()); 
     boolean recurExist = rc1.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); 

        RecurringController rc = new RecurringController(
          mDbHelper.open()); 
        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(); 
        } 
       } 
      } 
     } 
    } 
} 

奇怪的是当我将它设置为每隔一分钟重复一次时，它会运行并执行插入并更新我的reminderAlarm类中的SQL。但是，当我将它设置为每天运行一次时，它不起作用。我想知道我的代码哪部分出了问题。

在此先感谢。

Answer 1

您是否通过关闭应用程序以1分钟的间隔尝试报警，并检查数据库插入是否正在发生？

你也可以尝试改变：

DatabaseAdapter mDbHelper = new DatabaseAdapter(context.getApplicationContext()); 

与

DatabaseAdapter mDbHelper = new DatabaseAdapter(context);