java - Android Listview Inside viewpager 始终显示所有页面中最后一个 viewpager 页面数组列表数据

Question

它是一个 View 页面，其中包含具有特定问题答案的 ListView 。

Listview(Arraylist)一页一页地都有所有数据，我已经通过PrintLn在logcat上检查了它。所以问题只是在于，在所有 viewpager 页面中，listview 在 vi​​ewpager 的所有页面中显示最后一页答案(数据)。

我也尝试过holder.adapter.notifydatasetchanged();但它不起作用。

这是我的代码如下，

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        // TODO Auto-generated method stub
        View convertView = null;

        convertView=inflater.inflate(resource, null);
        holder=new ViewHolder();

    holder.lvCaseAnswers = (ListView)convertView.findViewById(R.id.lvCaseAnswers);
    holder.lvCaseAnswers.setTag(position);
    holder.txtCaseChallengePostedBy=(TextView)convertView.findViewById(R.id.txtCaseChallengePostedBy);
    holder.txtCaseChallengeQuestion = (TextView)convertView.findViewById(R.id.txtCaseChallengeQuestion);
    holder.txtCaseChallengeCategory = (TextView)convertView.findViewById(R.id.txtCaseChallengeCategory);
    holder.btnCaseChallengeSubmit=(Button)convertView.findViewById(R.id.btnCaseChallengeSubmit);
    //btnCaseChallengeTry=(Button)convertView.findViewById(R.id.btnCaseChallengeTry);

//get data from list
    System.out.println("que_id: "+listItems.get(position).getQue_id());
    dbconn.open();
    c=dbconn.getQuestionById(listItems.get(position).getQue_id());
    if(c.moveToFirst())
    {
        //set data from database
        Toast.makeText(context, "data:"+c.getString(0), 0).show();
        holder.txtCaseChallengePostedBy.setText(" Posted By "+c.getString(2));
        holder.txtCaseChallengeQuestion.setText(c.getString(4));
        String category = c.getString(3);
        category = category.substring(0,1).toUpperCase() + category.substring(1).toLowerCase();
        holder.txtCaseChallengeCategory.setText(category);

        holder.listanswers.add(c.getString(5));
        holder.listanswers.add(c.getString(6));
        holder.listanswers.add(c.getString(7));
        holder.listanswers.add(c.getString(8));
        holder.listanswers.add(c.getString(9));
        System.out.println("list item name:"+holder.listanswers.get(0));
        holder.adapter = new ArrayAdapter<String>(context, R.layout.raw_answers, holder.listanswers){

            @Override
            public View getView(int position,
                    View view, ViewGroup parent) {
                // TODO Auto-generated method stub
                Integer txtPosition = (Integer) parent.getTag();
                LayoutInflater inflater=LayoutInflater.from(context);
                view = inflater.inflate(R.layout.raw_answers, null);
                TextView txt=(TextView)view.findViewById(R.id.txtRawAnswers);

                CheckedTextView text = (CheckedTextView) view.findViewById(R.id.txtRawAnswers);
                text.setText(holder.listanswers.get(position));
                if(holder.listOptions.get(position).equals(holder.correct_ans))
                {
                    text.setTextColor(Color.GREEN);
                    text.setCompoundDrawablesWithIntrinsicBounds(R.drawable.custom_radio_btn, 0, R.drawable.ic_true, 0);
                }
                else
                {
                    text.setTextColor(Color.RED);
                    text.setCompoundDrawablesWithIntrinsicBounds(R.drawable.custom_radio_btn, 0, R.drawable.ic_false, 0);
                }
                return view;
            }
        };
        holder.adapter.notifyDataSetChanged();
        holder.lvCaseAnswers.setAdapter(holder.adapter);
        holder.lvCaseAnswers.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        Constants.setListViewHeightBasedOnChildren(holder.lvCaseAnswers);

        holder.correct_ans=c.getString(10);
        holder.answer=c.getString(11);
        holder.txtCaseChallengeUserAnswer.setText(holder.answer);

        for(int i=0;i<holder.listOptions.size();i++)
        {
            if(holder.listOptions.get(i).equals(holder.answer))
            {
                holder.lvCaseAnswers.setItemChecked(i, true);
            }
            else
            {
                holder.lvCaseAnswers.setItemChecked(i, false);
            }
        }

        holder.lvCaseAnswers.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub
                holder.answer=holder.listOptions.get(position);
            }
        });
        holder.adapter.notifyDataSetChanged();
        holder.lvCaseAnswers.setEnabled(false);
        holder.btnCaseChallengeSubmit.setVisibility(View.GONE);


    }
    dbconn.close();
    // Add viewpager_item.xml to ViewPager
    ((ViewPager) container).addView(convertView);

    return convertView;
    }

Answer 1

您没有在viewpager中使用Fragment。将 viewpager 与 fragment 一起使用。它会起作用的。