Question

我想我有点知道答案（不能这样做），但是如果有人遇到过这样的话，我仍然喜欢听SO社区：< / p>

我有一个我希望在列表/回收站视图中显示的项目的ArrayList。所以我有一个适配器读取这个后备阵列。现在我想根据数组中项目的某些属性隐藏一些项目。如何设置适配器以跳过此阵列中的某些项目？

我尝试从持有者引用父视图，并设置其可见性。这使视图不可见，但列表仍显示空行。

Answer 1

这样做，你需要覆盖适配器中的getItemViewType

你的Pojo

Hello.java
{
  boolean needHide =false;
}

适配器：

int ITEM_TYPE_USER_HIDE =0;
int ITEM_TYPE_USER_UNHIDE=1;

 @Override
    public int getItemViewType(int position) {
        return mList.get(position).needHide? ITEM_TYPE_USER_HIDE : ITEM_TYPE_UNHIDE;
    }
 @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == ITEM_TYPE_UNHIDE) {
            View view = LayoutInflater.from(mContext).inflate(R.layout.layout_not_hide, parent, false);
            return new NotHideHolder(view);
        } else {
            View view = LayoutInflater.from(mContext).inflate(R.layout.layout_hide_type, parent, false);
            return new HideViewHolder(view);
        }
    }

Answer 2

不幸的是，正如@Ben Trengrove建议的那样，设置View.GONE的可见性不适用于ListView，因为它仍然在列表中保留空行作为空行。

但是我正在研究一个项目并面临类似的问题，幸运的是我终于找到了解决方案。我使用ListView和ArrayAdapter。我的策略是每当我们想要隐藏视图时，我们将返回一个视图，而不会将其从ArrayAdapter的getView（）方法中膨胀。这是我的ArrayAdapter的完整工作代码：

public class CustomArrayAdapter extends ArrayAdapter<String> {

private Context context;
private Typeface typeface;
private ArrayList<String> list;
private LayoutInflater layoutInflater;


public CustomArrayAdapter(@NonNull Context context, ArrayList<String> list) {
    super(context, R.layout.simple_list_view_1, list);
    this.context = context;
    this.list = list;
    typeface  = Typeface.createFromAsset(context.getAssets(), "krdv010.ttf");
    layoutInflater = (LayoutInflater)
            context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@NonNull
@Override
/*Every time ListView needs to show a new row on screen, it will call
 this getView() method.*/
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {

    ViewHolder viewHolder = null;

    //Hide some views here...
    //Use position or whatever for the condition.
    //Provide a new View and return it without inflating it.
    //but still set a ViewHolder tag to it.
    if (position ==0 || position == 6 || position ==26){
        viewHolder = new ViewHolder();
        viewHolder.isEmpty = true;
        convertView = new View(context);
        convertView.setTag(viewHolder);
        return convertView;
    }

    //ListView is not asking you to recycle a view - normal workout
    if(convertView == null){
        convertView = layoutInflater.inflate(R.layout.simple_list_view_1, null);

        viewHolder = new ViewHolder();
        viewHolder.textView = (TextView)convertView.findViewById(R.id.text1);
        viewHolder.isEmpty = false;
        convertView.setTag(viewHolder);
    }

    //Here ListView is asking you to recycle the row layout.
    //But there may be the one which was not inflated.
    //So we will check for it and do what is required.
    else{
        viewHolder = (ViewHolder)convertView.getTag();
        if(viewHolder.isEmpty){
            //This is the one which wasn't inflated.
            convertView = layoutInflater.inflate(R.layout.simple_list_view_1, null);
            viewHolder.textView = (TextView)convertView.findViewById(R.id.text1);
            viewHolder.isEmpty = false;
            convertView.setTag(viewHolder);
        }
    }




    //Your normal business here
    String string = list.get(position);

    viewHolder.textView.setText(string);
    viewHolder.textView.setTypeface(typeface);
    viewHolder.textView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(context, "Position: " + position, Toast.LENGTH_SHORT).show();
        }
    });

    return convertView;
}

//The View Holder Class
private static class ViewHolder{
    TextView textView;
    Boolean isEmpty;
}
}

这是屏幕截图，注意没有空行@ 0和@ 6位置它们被隐藏成功：

Android列表 - 隐藏支持数组中的项目

2 个答案: