Question

我使用List.get(position)来获取ListView的位置。但是这会从当前滚动边界的顶部返回位置。我的ListView有50个项目，但你一次只能看到10个。因此，当您完全向下滚动并调用List.get（位置）时，您将获得10个列表项而不是50.如果单击ListView正好中间的项目，则得到5而不是25等。

如何从ListView的实际顶部获取ListView的排名。至少是最简单的方法。

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = null;

if (convertView == null) {
  LayoutInflater inflator = context.getLayoutInflater();      
  view = inflator.inflate(R.layout.addtowatchlist, null);
  final ViewHolder viewHolder = new ViewHolder();
  viewHolder.text = (TextView) view.findViewById(R.id.label);      
  viewHolder.addbutton = (Button) view.findViewById(R.id.button);
  viewHolder.addbutton
      .setOnClickListener(new Button.OnClickListener() {
        @Override
        public void onClick(View buttonview) {
            //I need the correct ACTUAL position here, not the VISABLE position                 
            Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(list.get(position).getUrl()));
            context.startActivity(browserIntent);              
            list.get(position).getUrl();                
            Model element = (Model) viewHolder.addbutton
                      .getTag();
                  element.setSelected(true);
        }
      });
  view.setTag(viewHolder);
  viewHolder.addbutton.setTag(list.get(position));
} else {
  view = convertView;
  ((ViewHolder) view.getTag()).addbutton.setTag(list.get(position));
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.text.setText(list.get(position).getName());      
return view;

}

编辑：我认为它与使用错误的viewHolder调用onClickListener有关，但我无法弄明白...

Answer 1

变量position已经是ListView中条目的位置我不知道你的名单里面有什么。
以下是BaseAdapter如何工作以及如何构建getView的教程：http://thinkandroid.wordpress.com/2010/01/13/custom-baseadapters/

Answer 2

经过多次痛苦的尝试，我自己修好了。缺乏理解ListView优化如何运作以及convertView参数的作用......

我将onClickListener移到if (convertView == null)块之外，并在getView返回其视图之前将其放置。这样，所采取的位置不是可回收的可见位置，而是从顶部一直到ACTUAL位置。

@Override
  public View getView(final int position, View convertView, ViewGroup parent) {
    View view = null;
    final AiringModel am = list.get(position);      
    am.setRealPosition(position, list.get(position).getUrl());    
    LayoutInflater inflator = context.getLayoutInflater();      
    view = inflator.inflate(R.layout.addtowatchlist, null);
    final ViewHolder viewHolder = new ViewHolder();
    viewHolder.text = (TextView) view.findViewById(R.id.label);
    if (convertView == null) {
        view.setTag(viewHolder);     
    } else {
      view = convertView;
      ((ViewHolder)view.getTag()).addbutton.setTag(list.get(position));      
    }
    ViewHolder holder = (ViewHolder) view.getTag();
    holder.text.setText(list.get(position).getName());       
    viewHolder.addbutton = (Button) view.findViewById(R.id.check);    
    viewHolder.addbutton.setTag((Integer)position);    
    viewHolder.addbutton
    .setOnClickListener(new Button.OnClickListener() {
        @Override
        public void onClick(View buttonview) {
            // TODO Auto-generated method stub                  
            int realPosition = am.getRealPosition();
            String realName = am.getRealName();
            Log.d("Pair created!", "Clicked button with position: "+ realPosition + " For item name: " + realName);
            Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(list.get(realPosition).getUrl()));
            context.startActivity(browserIntent);           
        }
    });
    return view;
  }

Android：从实际顶部获取ListView的位置

2 个答案: