Question

说明

我目前正在使用ViewHolder设计模式实现自定义ListViewAdapter。适配器使用的布局带有一个按钮，可以切换RelativeLayout的可见性。

问题：

当我单击按钮并显示RelativeLayout时，一切似乎都正常工作，直到我向下滚动。 当我向下滚动时，我看到其他列表项已经受到上一个按钮点击的影响，因此RelativeLayout在其他（错误）项目上可见。受按钮点击影响的项目似乎是当我向下滚动时回收的那个。请注意，其他一切正常，文本等都设置在正确的位置。

代码：

CustomListAdapter

public class ItemsListAdapter extends ArrayAdapter<Item> {
private Context mContext;
private List<Item> mItems;

public ItemsListAdapter(Context context, int resource, List<Item> objects) {
    super(context, resource);
    mContext = context;
    mItems = objects;
}

static class ViewHolder {
    View mView;
    boolean mExpanded;

    public ViewHolder(View view, boolean expanded)
    {
        mView = view;
        mExpanded = expanded;
    }
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    final Item item = getItem(position);

    final ViewHolder holder;
    if (v == null) {

        LayoutInflater mInflater = (LayoutInflater)
                mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        v = mInflater.inflate(R.layout.custom_list_item, null);

        holder = new ViewHolder(v, false);
        v.setTag(holder);
    } else {
        holder = (ViewHolder) v.getTag();
    }

    if(item != null)
    {
        TextView tvName = (TextView) holder.mView.findViewById(R.id.tv_name);
        tvName.setText(item.getName());

        RelativeLayout rlExpand = (RelativeLayout) holder.mView.findViewById(R.id.rl_expand);
        if(holder.mExpanded) {
            rlExpand.setVisibility(View.VISIBLE);
        }
        else {
            rlExpand.setVisibility(View.GONE);
        }

        TextView tvDescription = (TextView) holder.mView.findViewById(R.id.tv_description);
        if(tvDescription != null)
            tvDescription.setText(item.getDescription());

        final ImageButton ibExpand = (ImageButton) holder.mView.findViewById(R.id.ib_expand);
        ibExpand.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RelativeLayout rlExpand = (RelativeLayout) holder.mView.findViewById(R.id.rl_expand);
                if (rlExpand.getVisibility() == View.GONE) {
                    v.setVisibility(View.INVISIBLE);
                    rlExpand.setVisibility(View.VISIBLE);
                    holder.mExpanded = true;
                }
            }
        });

        ImageButton ibCollapse = (ImageButton) holder.mView.findViewById(R.id.ib_collapse);
        ibCollapse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RelativeLayout rlExpand = (RelativeLayout) holder.mView.findViewById(R.id.rl_expand);
                ibExpand.setVisibility(View.VISIBLE);
                rlExpand.setVisibility(View.GONE);
                holder.mExpanded = false;
            }
        });


    }

    return v;
}

@Override
public int getCount() {
    return mItems.size();
}

@Override
public Truism getItem(int position) {
    return mItems.get(position);
}

非常感谢任何帮助！提前谢谢！

Answer 1

尝试改变：

// js
.directive('mydir', function() {
   return {
       template: '{{x}}',
       scope: {},
       link: function(scope){
           scope.x = 5;
       }
   };
});

// html
<body ng-init="x=10">
    <mydir></mydir> 
</body>

将@Override public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; final Item item = getItem(position); final ViewHolder holder; if (v == null) { LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); v = mInflater.inflate(R.layout.custom_list_item, null); holder = new ViewHolder(v, false); v.setTag(holder); } else { holder = (ViewHolder) v.getTag(); } if(item != null) { TextView tvName = (TextView) holder.mView.findViewById(R.id.tv_name); tvName.setText(item.getName()); RelativeLayout rlExpand = (RelativeLayout) holder.mView.findViewById(R.id.rl_expand); if(item.isExpanded) { rlExpand.setVisibility(View.VISIBLE); } else { rlExpand.setVisibility(View.GONE); } TextView tvDescription = (TextView) holder.mView.findViewById(R.id.tv_description); if(tvDescription != null) tvDescription.setText(item.getDescription()); [...] } return v; }更改为holder.mExpanded

ListView - 使用ViewHolder Design进行错误的回收行为

1 个答案: