如何自动设置提醒哪些数据来自数据库？

Question

源代码：

    private void saveState() {

    DatabaseHelper myDbHelper = new DatabaseHelper(ReminderEditActivity.this);
    try {
        myDbHelper.createDataBase();
    } catch (IOException ioe) {
        throw new Error("Unable to create database");
    }
    try {
        myDbHelper.openDataBase();
    }catch(SQLException sqle){
        throw sqle;
    }
    c=myDbHelper.query("tblmain", null, null, null, null,null, null);
    if(c.moveToFirst())
    {
        do {
                    mRowId = c.getLong(0);
                    String datetime = c.getString(8);

                    SimpleDateFormat dateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
                    Date date = null;
                    try {
                        date = dateTimeFormat.parse(datetime);
                        mCalendar.setTime(date); 
                    } catch (ParseException e) {
                        Log.e("ReminderEditActivity", e.getMessage(), e); 
                    } 
    mCalendar.setTime(date);

    new ReminderManager(this).setReminder(mRowId, mCalendar); 
        } while (c.moveToNext());
    }
}

提醒管理器

public class ReminderManager {

private Context mContext; 
private AlarmManager mAlarmManager;

public ReminderManager(Context context) {
    mContext = context; 
    mAlarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
}

public void setReminder(Long taskId, Calendar when) {

    Intent i = new Intent(mContext, OnAlarmReceiver.class);
    i.putExtra(RemindersDbAdapter.KEY_eventid, (long)taskId); 

    PendingIntent pi = PendingIntent.getBroadcast(mContext, 0, i, PendingIntent.FLAG_ONE_SHOT); 

    mAlarmManager.set(AlarmManager.RTC_WAKEUP, when.getTimeInMillis(), pi);
}
}

onalarmreceiver

public class OnAlarmReceiver extends BroadcastReceiver {

private static final String TAG = ComponentInfo.class.getCanonicalName(); 


@Override   
public void onReceive(Context context, Intent intent) {
    Log.d(TAG, "Received wake up from alarm manager.");

    long rowid = intent.getExtras().getLong(RemindersDbAdapter.KEY_eventid);

    WakeReminderIntentService.acquireStaticLock(context);

    Intent i = new Intent(context, ReminderService.class); 
    i.putExtra(RemindersDbAdapter.KEY_eventid, rowid);  
    context.startService(i);

}
}

提醒服务

public class ReminderService extends WakeReminderIntentService {

public ReminderService() {
    super("ReminderService");
        }

@Override
void doReminderWork(Intent intent) {
    Log.d("ReminderService", "Doing work.");
    Long rowId = intent.getExtras().getLong(RemindersDbAdapter.KEY_eventid);

    NotificationManager mgr = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    Intent notificationIntent = new Intent(this, ReminderEditActivity.class); 
    notificationIntent.putExtra(RemindersDbAdapter.KEY_eventid, rowId); 

    PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT); 

    Notification note=new Notification(android.R.drawable.stat_sys_warning, getString(R.string.notify_new_task_message), System.currentTimeMillis());
    note.setLatestEventInfo(this, getString(R.string.notify_new_task_title), getString(R.string.notify_new_task_message), pi);
    note.defaults |= Notification.DEFAULT_SOUND; 
    note.flags |= Notification.FLAG_AUTO_CANCEL; 

    // An issue could occur if user ever enters over 2,147,483,647 tasks. (Max int value). 
    // I highly doubt this will ever happen. But is good to note. 
    int id = (int)((long)rowId);
    mgr.notify(id, note); 
}
}

我这里有这段代码，它从资产文件夹复制数据库，然后将数据设置为将用于添加通知的局部变量。我想自动设置数据来自数据库的提醒，但通知会继续读取单击按钮时的日期和时间，而不是数据库中的日期和时间，因此程序的结果是它触发通知和单击按钮后立即显示通知..请帮助我。

我想根据数据库中的日期和时间设置通知。请帮助我如何做到这一点。

Answer 1

你有没有试过在这里设置断点

 String datetime = c.getString(8);

并查看 datetime 变量中保存的时间？然后你可以查明时间出错的地方。您正在获取日期的毫秒时间，但我认为您需要从中减去当前时间才能获得提醒时间（时间 = when- System.currentTimeInMillis）。