Question

以下是我在Bean类中插入数据并在ArrayList中插入Bean类的方法，但是当我尝试从Bean getter方法获取值时，我得到NULL值。

     public ArrayList<QuestionBean> GetClickedIdImagesQuranHadeesBean(String topic_id)
{ ArrayList<QuestionBean> questionImageNameList = new ArrayList<QuestionBean>();

          String [] splits = topic_id.split("-");
          Integer [] realNumbers = new Integer [splits.length];

          String sqlSelect = "SELECT topic_question.id,topic_question.question_image_name,topic.topic_name,topic_question.topic_id  FROM topic_question,topic WHERE topic.id=topic_question.topic_id AND topic_question.topic_id IN ";
          String whereStatement = "(";
          for (int i = 0; i<splits.length; i++)
          {
              realNumbers[i] = Integer.parseInt(splits[i]);
              whereStatement += realNumbers[i]+((i == splits.length -1) ? "" :",");

          }
          whereStatement += ");";

          sqlSelect += whereStatement + "ORDER BY topic_question.topic_id";

          Cursor cursor = database.rawQuery(sqlSelect,null);
          Log.i("Cursor Query Print:",""+sqlSelect);
          if(cursor != null) {
            cursor.moveToFirst();

            while (!cursor.isAfterLast()) {
            Log.d("cursor",""+cursor);
            QuestionBean questionBeanInstance = new QuestionBean();
            questionBeanInstance.setQuestionId(cursor.getInt(0));
            Log.d("questionBeanInstance id",""+cursor.getInt(0));
            questionBeanInstance.setQuestionImageName(cursor.getString(1));
            Log.d("questionBeanInstance QuestionImageName",""+cursor.getString(1));
            questionBeanInstance.setQuestionTopicName(cursor.getString(2));
            Log.d("questionBeanInstance setQuestionTopicName",""+cursor.getString(2));
            questionBeanInstance.setQuestionTopicId(cursor.getInt(3));
            Log.d("questionBeanInstance setQuestionTopicId",""+cursor.getInt(3));
            questionImageNameList.add(questionBeanInstance);

                }
            } else {
                Log.d("", "Cursor is Null");
                Log.d("retrieving all parameters", "count < 0");
            }

            cursor.close();
            return questionImageNameList;
        }

//当我试图从bean类中获取值时，我得到空值。有人请指出我在这里做错了什么。

private void GetQuestionDataForQuranHadeesBean(String clickedTopicIdString)
    {
        ArrayList<QuestionBean> questionImagesNameList = new ArrayList<QuestionBean>();
        questionImagesNameList = AndroidUtil.externalDb.GetClickedIdImagesQuranHadeesBean(clickedTopicIdString);
        Log.i("questionImagesNameList:",""+questionImagesNameList + ":::id:"
                + clickedTopicIdString);
        for (int i = 0;i < questionImagesNameList.size();i++) {
            QuestionBean ques = new QuestionBean();
            final TableRow questionTableRow = (TableRow) inflator.inflate(
                    R.layout.questions_table_row, null);
            ImageView questionImageView = (ImageView) questionTableRow
                    .findViewById(R.id.questionImageView);
            Log.i("ques.getQuestionImageName()",""+ques.getQuestionImageName());
            Log.i("ques.getQuestionTopicId",""+ques.getQuestionTopicId());
            Log.i("ques.getQuestionTopicName",""+ques.getQuestionTopicName());

} 这些行返回null：

Log.i("ques.getQuestionImageName()",""+ques.getQuestionImageName());
            Log.i("ques.getQuestionTopicId",""+ques.getQuestionTopicId());
            Log.i("ques.getQuestionTopicName",""+ques.getQuestionTopicName());

列表中的数据显示为：这一行的日志是：

Log.i("questionImagesNameList:",""+questionImagesNameList + ":::id:"
                + clickedTopicIdString);

logcat的：

02-15 14：02：29.705：I / questionImagesNameList：（360）：[QuestionBean [questionId = 1，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Quran，questionTopicId = 0]，QuestionBean [questionId = 2，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Quran，questionTopicId = 0]，QuestionBean [questionId = 3，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Quran，questionTopicId = 0]，QuestionBean [questionId = 4，questionImageName = quran_o_hadees_question_4， questionTopicName = Quran，questionTopicId = 0]，QuestionBean [questionId = 5，questionImageName = quran_o_hadees_question_5， questionTopicName = Quran，questionTopicId = 0]，QuestionBean [questionId = 6，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 7，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 8，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 9，questionImageName = quran_o_hadees_question_4， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 10，questionImageName = quran_o_hadees_question_5， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 11，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 12，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 13，questionImageName = quran_o_hadess_ques1.png， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 14，questionImageName = quran_o_hadees_question_4， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 15，questionImageName = quran_o_hadees_question_5， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 16，questionImageName = quran_o_hadees_question_6， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 17，questionImageName = quran_o_hadees_question_7， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 18，questionImageName = quran_o_hadees_question_8， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 19，questionImageName = quran_o_hadees_question_9， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 20，questionImageName = quran_o_hadees_question_10， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 21，questionImageName = quran_o_hadees_question_11， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 22，questionImageName = quran_o_hadees_question_12， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 23，questionImageName = quran_o_hadees_question_13， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 24，questionImageName = quran_o_hadees_question_14， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 25，questionImageName = quran_o_hadees_question_15， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 26，questionImageName = quran_o_hadees_question_16， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 27，questionImageName = quran_o_hadees_question_17， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 28，questionImageName = quran_o_hadees_question_18， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 29，questionImageName = quran_o_hadees_question_19， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 30，questionImageName = quran_o_hadees_question_20， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 31，questionImageName = quran_o_hadees_question_21， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 32，questionImageName = quran_o_hadees_question_22， questionTopicName = Hadees，questionTopicId = 1]，QuestionBean [questionId = 33，questionImageName = quran_o_hadees_question_6， questionTopicName = Quran，questionTopicId = 0]，QuestionBean [questionId = 34，questionImageName = quran_o_hadees_question_7， questionTopicName =古兰经，q

Answer 1

试试这个......

  for (int i = 0;i < questionImagesNameList.size();i++) {
            QuestionBean ques = questionImagesNameList.get(i);
           //...........
  }

从Android中的Bean类获取Null值？

1 个答案: