Question

我有一个ListActivity，在我的列表中，我有高度复杂的listitems，包含多个ImagesViews TextViews和Buttons。当我单击一个按钮时，我想编辑一些文本视图并更改一些背景颜色。我的实现工作，但只有当我点击的按钮在第一行可见时。我正在使用getChildAt()抓取其中一条可见行，但我需要知道要抓哪一行。

public void onClick(View v){
    System.out.println("Something got clicked");
    if(v.getId() == R.id.lovebutton){
        MainListItem i = mainAdapter.getItem(listView.getFirstVisiblePosition());
            i.loved=true;
            i.loves++;
            View view;
                view = listView.getChildAt(0);
                //view = listView.getChildAt(1);
            ((TextView) view.findViewById(R.id.lovecount)).setText(String.valueOf(i.loves));
            view.findViewById(R.id.lovebutton).setBackgroundColor(Color.parseColor(i.brandLoveColor));
            ((ImageView)view.findViewById(R.id.lovebutton)).setImageResource(R.drawable.lovewhite);
        }}

Answer 1

有很多方法可以做到这一点。保存pojo中的状态，在onClick中更新它们并调用#notifyDataSetChanged()。或者，您可以将位置作为标记添加到适配器的getView中的按钮。在OnClick中，您可以获取标记。这样您就可以知道按钮属于哪个位置。

在Joe的帮助下 - Android: Access child views from a ListView

public void onClick(View v){
    System.out.println("Something got clicked");
    if(v.getId() == R.id.lovebutton){
        int wantedPosition = Integer.parseInt(view.getTag());
        int firstPosition = listView.getFirstVisiblePosition() - listView.getHeaderViewsCount(); // This is the same as child #0
        int wantedChild = wantedPosition - firstPosition;
        // Say, first visible position is 8, you want position 10, wantedChild will now be 2
        // So that means your view is child #2 in the ViewGroup:
        if (wantedChild < 0 || wantedChild >= listView.getChildCount()) {
          Log.w(TAG, "Unable to get view for desired position, because it's not being displayed on screen.");
          return;
        }
        // Could also check if wantedPosition is between listView.getFirstVisiblePosition() and listView.getLastVisiblePosition() instead.
        View wantedView = listView.getChildAt(wantedChild);
        MainListItem i = mainAdapter.getItem(wantedPosition);
        i.loved=true;
        i.loves++;
        ((TextView) view.findViewById(R.id.lovecount)).setText(String.valueOf(i.loves));
        view.findViewById(R.id.lovebutton).setBackgroundColor(Color.parseColor(i.brandLoveColor));
        ((ImageView)view.findViewById(R.id.lovebutton)).setImageResource(R.drawable.lovewhite);
    }
}

Answer 2

在listView中获取单击的行，您必须使用“OnItemClickListener”。

 lv.setOnItemClickListener(new OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> arg0, View arg1,
                            int pos, long arg3) {
                        HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(pos);    
                          System.out.println(pos);//This will return your position

                    }
                });

如何知道按下按钮的android列表视图中的哪一行？

2 个答案: