Question

我刚刚收到了java.lang.IndexOutOfBoundsException：但无法理解它是由什么造成的。基本上，我正在将sqlite表的记录集成到listview中。这是我的SQL查询，用于从表中获取记录。

//Your array
var array = {"noun":{"syn":["leap","saltation","startle","start","parachuting","jumping","actuation","descent","inborn reflex","increase","innate reflex","instinctive reflex","physiological reaction","propulsion","reflex","transition","unconditioned reflex"]},"verb":{"syn":["leap","bound","spring","startle","start","leap out","jump out","stand out","stick out","rise","climb up","jump off","derail","chute","parachute","jumpstart","jump-start","pass over","skip","skip over","alternate","alter","appear","assail","assault","attack","change","climb","dive","drop","enter","go","leave out","locomote","look","miss","mount","move","neglect","omit","overleap","overlook","participate","plunge","plunk","pretermit","seem","set on","shift","start up","switch","travel","vary","wax"],"rel":["leap out","jump on"]}};

//The list you want to iterate
var words = array.noun.syn;

//Iterating in the array
    for (i=0; i<words.length; i++) {
        //Words[i] is every value return after leap (including itself)
        console.log(words[i]);
    }

这是我检索数据的方法： -

public ArrayList<Integer> getRecordsCount(int no) {

    ArrayList<Integer> count = new ArrayList<>();

    Cursor c = database.rawQuery(
            "select count(*) as TotalCount, tDate, " +
                    "strftime('%d', tDate) as DayPart, " +
                    "strftime('%m', tDate) as MonthPart, " +
                    "strftime('%Y', tDate) as YearPart " +
                    "from library " +
                    "where type = '" + no + "' " +
                    "group by MonthPart, YearPart", null);

    while (c.moveToNext()) {
        count.add(c.getInt(0));
    }

    return count;
}

但是，当我运行此代码时，它会给我这个错误吗？

public void setDataInList(int no) {

    if (no == 0) {

        ArrayList<Integer> count = helper.getRecordsCount(1);

        mainGetLibraryModels.clear();
        MainLibraryModelWS modelWS = helper.getAllRecordsMonthWise2(no);
        for (int i = 0; i < modelWS.getRecords().size(); i++) {

            WSLibraryModel model = new WSLibraryModel();
            model.setAmount(modelWS.getRecords().get(i).getAmount());
            model.setTotalCount("" + count.get(i));
            model.setYearPart(modelWS.getRecords().get(i).getYearPart());
            model.setMonthPart(modelWS.getRecords().get(i).getMonthPart());

            mainGetLibraryModels.add(model);

        }
        adapter.notifyDataSetChanged();

    } else if (no == 1) {

        ArrayList<Integer> count = helper.getRecordsCount(2);

        mainGetLibraryModels.clear();
        MainLibraryModelWS modelWS = helper.getAllRecordsMonthWise2(no);
        for (int i = 0; i < modelWS.getRecords().size(); i++) {

            WSLibraryModel model = new WSLibraryModel();
            model.setAmount(modelWS.getRecords().get(i).getAmount());
            model.setTotalCount("" + count.get(i));
            model.setYearPart(modelWS.getRecords().get(i).getYearPart());
            model.setMonthPart(modelWS.getRecords().get(i).getMonthPart());

            mainGetLibraryModels.add(model);
        }
        adapter.notifyDataSetChanged();

    } else {

        mainGetLibraryModels.clear();
        MainLibraryModelWS modelWS = helper.getAllRecordsMonthWise2(no);
        for (int i = 0; i < modelWS.getRecords().size(); i++) {

            WSLibraryModel model = new WSLibraryModel();
            model.setAmount(modelWS.getRecords().get(i).getAmount());
            model.setTotalCount(" - ");
            model.setYearPart(modelWS.getRecords().get(i).getYearPart());
            model.setMonthPart(modelWS.getRecords().get(i).getMonthPart());

            mainGetLibraryModels.add(model);

        }
        adapter.notifyDataSetChanged();

    }
 }

Answer 1

而不是：

ArrayList<Integer> count = helper.getRecordsCount(1);

试试这个：

ArrayList<Integer> count = helper.getRecordsCount(0);

Answer 2

首先，您需要避免多次调用getRecords（）。它会降低性能并可能无法返回相同的结果 - 可能是您出错的原因。相反，引入一个本地参数作为此函数的缓存输出并使用它。

Answer 3

首先使用switch而不是if-else分支，因为我从查询中看到你的结果会将结果的修正数作为数组给出（切换更有效并提高可读性）。< / p>

public void setDataInList(int no) {  //just a suggestion not a answer

  switch (no){
     case 0 :   
          //Your Code as you specified in your code context.
           break;
     case 1 :
          //Your Code as you specified in your code context.

          break;
     case 2 :
          //Your Code as you specified in your code context.

         break;
    default :
         break;
   }

现在，如果您看到Exception StackTrace并调试应用程序，一旦您轻松获得解决方案，就会出现问题。

这就是你的堆栈跟踪所说的 -

java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1

希望您知道这个受欢迎的异常IndexOutOfBoundsException仅在您尝试访问数组中不存在的任何数组索引时出现。

现在，您的错误消息清楚地表明您的Array尺寸为one。这意味着您的数组只能访问索引zero（0）。

所以，请调试你的代码，并尝试找出哪一行代码实际上产生了异常

如何解决IndexOutOfBoundsException：索引1无效，大小是1？

3 个答案: