java - 无法为我的公历设置所需的时间

Question

下面代码中的问题是我试图将 EVENING 时间设置为下午 6 点。请忽略 Calendar.evening 值，因为它用于测试目的。这是我的日志文件

D/Notification: MORN Tue Nov 14 16:00:00 GMT+05:30 2017 vs EVE Tue Nov 14 16:00:00 GMT+05:30 2017

MORN: Tue Nov 14 16:00:00 GMT+05:30 2017 vs Tue Nov 14 16:00:00 GMT+05:30 2017 EVE: Tue Nov 14 16:00:00 GMT+05:30 2017 vs Tue Nov 14 16:00:00 GMT+05:30 2017

现在的问题是两个 getTime() 都返回当前时间。

我希望 IF LOOP 在下午 4 点和上午 8 点执行，对于这个例子，我的逻辑似乎非常合法!请指出错误

public class MyNotificationService extends Service {
@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}


static Calendar eve,morn;

@Override
public void onCreate() {
    super.onCreate();
    morn=Calendar.getInstance();
    morn.set(Calendar.HOUR_OF_DAY, 4);
    morn.set(Calendar.MINUTE, 0);
    morn.set(Calendar.SECOND, 0);
    morn.set(Calendar.AM_PM,1);

    eve=Calendar.getInstance();
    eve.set(Calendar.HOUR_OF_DAY, 6);
    eve.set(Calendar.MINUTE, 0);
    eve.set(Calendar.SECOND, 0);
    eve.set(Calendar.AM_PM,1);

    Log.d("Notification", "MORN "+morn.getTime().toString() +" vs EVE "+eve.getTime().toString());

}

@Override
public void onStart(Intent intent, int startId) {
    super.onStart(intent, startId);

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    setTimer();

    return Service.START_STICKY;
}



void setTimer(){

    Timer timer = new Timer ();
    TimerTask hourlyTask = new TimerTask () {

        @Override
        public void run () {
            Calendar now=Calendar.getInstance();
            now.set(Calendar.MINUTE,0);
            now.set(Calendar.SECOND,0);


            Log.d("Notification MORN", morn.getTime().toString() +" vs "+now.getTime().toString());
            if (now.compareTo(morn)==0||now.getTime().equals(morn.getTime())) {
                Log.d("Notification Func", eve.getTime().toString() + " MORNING exe");
                Handler mainHandler = new Handler(Looper.getMainLooper());
                Runnable myRunnable = new Runnable() {
                    @Override
                    public void run() {
                        if (isInternetOn(getApplicationContext())){
                            getCaseDetails();
                        }else {
                            setNotification("Internet not available","Please check your Cases");
                        }
                    }
                };
                mainHandler.post(myRunnable);
            }
            Log.d("Notification EVE", eve.getTime().toString() +" vs "+now.getTime().toString());
            if (now.compareTo(eve)==0||now.getTime().equals(eve.getTime())) {
                    Log.d("Notification Func", eve.getTime().toString() + " EVENING exe");
                Handler mainHandler = new Handler(Looper.getMainLooper());
                Runnable myRunnable = new Runnable() {
                    @Override
                    public void run() {
                        getCaseDetails();
                    }
                };
                mainHandler.post(myRunnable);
            }
        }
    };
//        timer.schedule (hourlyTask, 0L, 1000*60*60);
    timer.schedule (hourlyTask, 0L, 30*1000);
}


void getDetails() {
   }



@Override
public void onDestroy() {
    super.onDestroy();
    Toast.makeText(this, "Notification Service Stopped", Toast.LENGTH_LONG).show();
}



public void setNotification(String titleStr,String descStr) {

   setting alarm here.
}

}

Answer 1

使用 AM/PM 需要使用 Calendar.HOUR，而不是 Calendar.HOUR_OF_DAY，设置 AM/PM 时会忽略它:

Calendar morn = Calendar.getInstance();
morn.set(Calendar.HOUR_OF_DAY, 4);
morn.set(Calendar.MINUTE, 0);
morn.set(Calendar.SECOND, 0);
morn.set(Calendar.AM_PM, Calendar.PM);

System.out.println(someDateFormat.format(morn.getTime()));
// current hour

morn = Calendar.getInstance();
morn.set(Calendar.HOUR, 4);
morn.set(Calendar.MINUTE, 0);
morn.set(Calendar.SECOND, 0);
morn.set(Calendar.AM_PM, Calendar.PM);

System.out.println(someDateFormat.format(morn.getTime()));
// correct hour