Question

在getView方法中，当视图类型为vTypeItem时，它应返回我的数组列表中的所有项，但它返回除第一个之外的所有项，因此显示ListView除第一个之外的所有项目

public class DrawerAdapter extends ArrayAdapter<DrawerCustomList> {

    private static final int vTypeHeader = 0;
    private static final int vTypeItem = 1;
    ArrayList<DrawerCustomList> mList = new ArrayList<>();

    public DrawerAdapter(Context context, ArrayList<DrawerCustomList> list) {
        super(context,0,list);
        mList = list;
    }

    @Override
    public int getItemViewType(int position) {
        return (position==0)?vTypeHeader:vTypeItem;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

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

    @NonNull
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int type = getItemViewType(position);
        View v = convertView;
        MyViewHolder mViewHolder = null;
        if (v==null){
            if(type==vTypeItem){
                v = LayoutInflater.from(getContext()).inflate(R.layout.drawer_single_item,parent,false);
                mViewHolder= new MyViewHolder(v,type);
                DrawerCustomList val = mList.get(position);
                mViewHolder.itemImage.setImageResource(val.getmListImage());
                mViewHolder.itemName.setText(val.getmListName());
            }else {
                v = LayoutInflater.from(getContext()).inflate(R.layout.drawer_header_layout,parent,false);
                mViewHolder= new MyViewHolder(v,type);
            }
        }
        v.setTag(mViewHolder);
        return v;
    }

    public static class MyViewHolder{

        TextView itemName,headerName,headerEmail;
        CircleImageView headerPicture;
        ImageView itemImage;

        public MyViewHolder(View v,int type){
            if(type==vTypeHeader){
                headerName = (TextView)v.findViewById(R.id.drawerHeaderName);
                headerEmail = (TextView)v.findViewById(R.id.drawerHeaderEmail);
                headerPicture = (CircleImageView)v.findViewById(R.id.drawerCircleImageView);
            }else {
                itemName = (TextView) v.findViewById(R.id.drawerItemName);
                itemImage = (ImageView)v.findViewById(R.id.drawerItemImage);
            }
        }
    }
}

Answer 1

好像您没有考虑header方法中的getCount()视图。

首先将后者改为：

@Override
public int getCount() {
    return mList.size() + 1; // accounting for the header
}

现在请记住，在getView()方法的当前版本中，如果position == 0您将显示header，这是正确的。但是如果position == 1，你会做

....
if(type==vTypeItem){
        v = LayoutInflater.from(getContext()).inflate(R.layout.drawer_single_item,parent,false);
        mViewHolder= new MyViewHolder(v,type);
        DrawerCustomList val = mList.get(position);

注意mList.get(position)如何实际获取列表中的第二项（索引为1），而不是第一项，这就是您所需要的。因此，将此行更改为...mList.get(position - 1)，您的问题应该得到解决。

Answer 2

我如下更改了您的代码，似乎工作正常。在这里，我在drawer_header_layout中添加了drawer_single_item布局的抽屉项名称，drawerItemImage控件。在getView方法中进行以下更改。

@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    int type = getItemViewType(position);
    View v = convertView;
    MyViewHolder mViewHolder = null;        
        if(type==vTypeItem){
            v = LayoutInflater.from(getContext()).inflate(R.layout.drawer_single_item,parent,false);
            mViewHolder= new MyViewHolder(v,type);
            DrawerCustomList val = mList.get(position);
            mViewHolder.itemImage.setImageResource(val.getmListImage());
            mViewHolder.itemName.setText(val.getmListName());
        }else {
            v = LayoutInflater.from(getContext()).inflate(R.layout.drawer_header_layout,parent,false);
            mViewHolder= new MyViewHolder(v,type);
            DrawerCustomList val = mList.get(position);
            mViewHolder.itemImage.setImageResource(val.getmListImage());
            mViewHolder.itemName.setText(val.getmListName());
        }        
    v.setTag(mViewHolder);
    return v;
}

将MyViewHolder更改为此：

public static class MyViewHolder{

    TextView itemName,headerName,headerEmail;
    CircleImageView headerPicture;
    ImageView itemImage;

    public MyViewHolder(View v,int type){
        if(type==vTypeHeader){
            headerName = (TextView)v.findViewById(R.id.drawerHeaderName);
            headerEmail = (TextView)v.findViewById(R.id.drawerHeaderEmail);
            headerPicture = (CircleImageView)v.findViewById(R.id.drawerCircleImageView);
            itemName = (TextView) v.findViewById(R.id.drawerItemName);
            itemImage = (ImageView)v.findViewById(R.id.drawerItemImage);
        }else {
            itemName = (TextView) v.findViewById(R.id.drawerItemName);
            itemImage = (ImageView)v.findViewById(R.id.drawerItemImage);
        }
    }
}

希望这会有所帮助。

ArrayAdapter getView不返回第一个项目

2 个答案: