如何在图库拖动时更改列表视图数据集？

Question

我有一个画廊，其中包含代表类别的自定义视图，根据所选画廊的类别，列表视图应显示一个或另一个数据集，它正在工作，但显示的数据集与所选类别不对应，

这是图库的适配器：

public class GalleryViewAdapter extends BaseAdapter {

private Context mContext;
private ArrayList<TreeNode> mNodes;
private HomeFragment mFrag;
private ListView mList;

public GalleryViewAdapter(Context c, ArrayList<TreeNode> mNodes, HomeFragment mFrag, ListView galleryList) {
    mContext = c;
    this.mNodes = mNodes;
    this.mFrag = mFrag;
    mList = galleryList;
}

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

@Override
public Object getItem(int position) {
    return mNodes.get(position);
}

@Override
public long getItemId(int position) {
    TreeNode childNode = (TreeNode) mNodes.get(position);
    if (childNode.getReference() instanceof Categoria) {
        return Long.valueOf(((Categoria) mNodes.get(position).getReference()).idCat);
    } else {
        return Long.valueOf(((Contenido) mNodes.get(position).getReference()).idCon);
    }
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {

    final TreeNode childNode = (TreeNode) mNodes.get(position);

    WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
    int screenWidth = wm.getDefaultDisplay().getWidth();

    if (childNode.getReference() instanceof Categoria) {
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.fragment_gallery_item, parent, false);
        }
        ImageView imageView = (ImageView) convertView.findViewById(R.id.fragment_gallery_item_imageview);
        TextView mTextView = (TextView) convertView.findViewById(R.id.fragment_gallery_item_textView);

        Categoria mCat = (Categoria) childNode.getReference();
        imageView.setImageBitmap(Tools.scaleImageInPixels(Tools.createBitmapFromBase64(mCat.icon64.getBytes()),
                screenWidth));
        mTextView.setText(mCat.nombreCat);

        int newHeight = mFrag.getActivity().getWindowManager().getDefaultDisplay().getHeight() / 4;
        int orgWidth = imageView.getDrawable().getIntrinsicWidth();
        int orgHeight = imageView.getDrawable().getIntrinsicHeight();

        int newWidth = ((int) Math.floor((orgWidth * newHeight) / orgHeight) / 2);

        imageView.setMaxHeight(newHeight);
        imageView.setMaxWidth(newWidth);

        GalleryListAdapter mListAdapter = new GalleryListAdapter(mFrag.getActivity(), childNode, mFrag);
        mList.setAdapter(mListAdapter);
    } else {

    }

    return convertView;
}
}

这是我的 galleryListViewAdapter

public class GalleryListAdapter extends BaseAdapter {

private Context mContext;
private TreeNode mNode;
private HomeFragment mFrag;


public GalleryListAdapter(Context mContext, TreeNode mNode, HomeFragment mFrag) {
    this.mContext = mContext;
    this.mNode = mNode;
    this.mFrag = mFrag;
}

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

@Override
public Object getItem(int position) {
    return mNode.getChildren().get(position);
}

@Override
public long getItemId(int position) {

    if (mNode.getReference() instanceof Categoria) {
        return Long.valueOf(((Categoria) mNode.getReference()).idCat);
    } else {
        return Long.valueOf(((Contenido) mNode.getReference()).idCon);
    }
}

@Override
public boolean hasStableIds() {
    return true;
}

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

    if (mNode.getReference() instanceof Categoria) {
        mNode = (TreeNode) mNode.getChildren().get(position);
    }
        if (rowView == null) {
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            rowView = inflater.inflate(R.layout.fragment_list_carrousel_item, parent, false);
        }

        TextView autorView = (TextView) rowView.findViewById(R.id.firstLine);
        TextView textView = (TextView) rowView.findViewById(R.id.secondLine);
        ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);

        Contenido mCon = (Contenido) mNode.getReference();
        autorView.setText(mCon.tituloCon);
        textView.setText("");

        imageView.setImageBitmap(Tools.scaleImage(Tools.getParentIconRecursive(mNode),
                (int) MainActivity.getInstance().getAttributeDimension(R.attr.listPreferredItemHeight)));

        int newHeight = mFrag.getActivity().getWindowManager().getDefaultDisplay().getHeight() / 2;
        int orgWidth = imageView.getDrawable().getIntrinsicWidth();
        int orgHeight = imageView.getDrawable().getIntrinsicHeight();

        int newWidth = ((int) Math.floor((orgWidth * newHeight) / orgHeight) / 2);

        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                newWidth, newHeight);
        imageView.setLayoutParams(params);


    rowView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mFrag.goToNode(mNode);
        }
    });
    return rowView;
}
}

非常感谢！

Answer 1

您必须像这样在 Gallery 上设置 OnItemSelectedListener：

private Gallery.OnItemSelectedListener _scrollListener = new Gallery.OnItemSelectedListener()
    {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
                    //execute the method that refresh the listview
                    fillListView(position);

            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {

            }
    };

如何在图库拖动时更改列表视图数据集？

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