滚动时ListView项目随机播放

Question

我的适配器中有以下代码.每个项目包含两个图像,每个图像下面有一个复选框.我想显示这些项目的列表,但是当我向上和向下滚动时,似乎第一个和最后一个项目是相同的.然后一段时间后其他项目也会出现问题.我已经查看了有关此问题的其他问题,我无法找到为什么我的ListView项目在我向下滚动后向上移动.

@Override
public View getView(final int position, View convertView, ViewGroup parent){
    View view = convertView;
    if(view == null){
        viewHolder = new ViewHolder();
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.wheel_list_item, null);

        viewHolder.decisionNum = (TextView)view.findViewById(R.id.decisionNumText);
        viewHolder.leftWheel = (ImageView)view.findViewById(R.id.leftWheel);
        viewHolder.rightWheel = (ImageView)view.findViewById(R.id.rightWheel);
        viewHolder.leftCheckBox = (CheckBox)view.findViewById(R.id.leftCheckBox);
        viewHolder.rightCheckBox = (CheckBox)view.findViewById(R.id.rightCheckBox);
        viewHolder.wheelTuple = list.get(position);
        view.setTag(viewHolder);
    }
    else{
        viewHolder = (ViewHolder)view.getTag();
    }

    viewHolder.decisionNum.setText(Integer.toString(position + 1));

    viewHolder.leftCheckBox.setClickable(false);
    viewHolder.rightCheckBox.setClickable(false);

    viewHolder.leftWheel.setImageBitmap(new WheelView(context, viewHolder.wheelTuple.left).getBitmapReduced());
    viewHolder.rightWheel.setImageBitmap(new WheelView(context, viewHolder.wheelTuple.right).getBitmapReduced());

    int id = context.getResources().getIdentifier("GREY", "color", context.getPackageName());
    int colorId=context.getResources().getColor(id);

    if(!viewHolder.wheelTuple.left.isChosen()){
        viewHolder.leftWheel.setColorFilter(colorId, PorterDuff.Mode.MULTIPLY);
        viewHolder.rightCheckBox.setChecked(true);
    }
    else{
        viewHolder.rightWheel.setColorFilter(colorId, PorterDuff.Mode.MULTIPLY);
        viewHolder.leftCheckBox.setChecked(true);
    }

    return view;
}

static class ViewHolder{
    TextView decisionNum;
    ImageView leftWheel;
    ImageView rightWheel;
    CheckBox leftCheckBox;
    CheckBox rightCheckBox;
    WheelListActivity.WheelTuple wheelTuple;
}

Answer 1

你必须使用以下两个函数,

@Override
    public int getViewTypeCount() {
        if(searchList.size()==0){
            return 1;
        }
        return searchList.size();
    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

如果你的dataArrayList的大小为0,那么记得从getViewTypeCount()返回1,否则你将得到ArrayIndexOutOfBoundsException.请参阅上面的代码示例.