Question

我有这样的代码，我在Thread上运行它。所以，它会每秒检查一次：

SQLiteDatabase db = helper.getReadableDatabase();
    cursor = db.rawQuery("select * from list where day = '"+day+"'", null);
    cursor.moveToFirst();

    for (int i=0; i<cursor.getCount(); i++){

Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());

cal.set(Calendar.HOUR_OF_DAY, cursor.getString[2]);//13
cal.set(Calendar.MINUTE, cursor.getString[3]);//10
cal.set(Calendar.SECOND, 0);

long noon_start = cal.getTimeInMillis();

cal.set(Calendar.HOUR_OF_DAY, cursor.getString[4]);//13
cal.set(Calendar.MINUTE, cursor.getString[5]);//15
cal.set(Calendar.SECOND, 0);


long noon_end = cal.getTimeInMillis();
long now = System.currentTimeMillis();//current time

    if(now > noon_start && now<noon_end){    


        if (jl.active==false){//ignore it

            Toast.makeText(theService.this, "If "+(noon_end-now), Toast.LENGTH_LONG).show();

        }                               

    }else{ 


        if (jl.active==true){ //ignore it

            Toast.makeText(theService.this, "Else "+(noon_end-now), Toast.LENGTH_LONG).show();
        }               
    }

cursor.moveToNext();

    }

我想现在时间13:10到13:15，Toast会设置文本If，否则还会设置setText。但它不起作用。如果时间＆lt; 13:10或＆gt; 13.15，则可行。但是当13:10 - 13:15时，它会遇到if，之后再跑到别的地方，如果再次。请帮忙。。我真的很困惑。有什么建议??

我认为cursor.moveToNext

中的错误

Answer 1

你走了：

    Calendar cal = Calendar.getInstance();     // this will get a calendar set to the current time
    Date now = new Date(cal.getTimeInMillis()); // we make a date object with the current time

    cal.set(Calendar.HOUR_OF_DAY, 13);        // now we set the calendar to a specific time
    cal.set(Calendar.MINUTE, 10);
    cal.set(Calendar.SECOND, 0);

    Date start = new Date(cal.getTimeInMillis());  // create a new date       
    cal.set(Calendar.MINUTE, 15);                  // set calendar minutes. hour and seconds stay the same anyway
    Date end = new Date(cal.getTimeInMillis());    

    if (now.after(start) && now.before(end)) {
                              Toast.makeText(theService.this, "If "+(noon_end-now), Toast.LENGTH_SHORT).show();

    } else {
                    Toast.makeText(theService.this, "Else "+(noon_end-now), Toast.LENGTH_SHORT).show();

    }

android：日历if else不起作用

1 个答案: