i am trying to set a header to staggardGridLayoutManeger

Question

i am trying to set a header to staggardGridLayoutManeger i have the code from this url https://github.com/willblaschko/header-footer-recycler-view. this code contains header and footer for all the types of layout. can anyone help to set the adapter only for staggardGridLayout this is the code form the sample at

enter code here
public class RecyclerViewHeaderFooterAdapter extends RecyclerView.Adapter {

public static final int TYPE_MANAGER_OTHER = 0;
public static final int TYPE_MANAGER_LINEAR = 1;
public static final int TYPE_MANAGER_GRID = 2;
public static final int TYPE_MANAGER_STAGGERED_GRID = 3;


public static final int TYPE_HEADER = 7898;
public static final int TYPE_FOOTER = 7899;

private List<View> mHeaders = new ArrayList<>();
private List<View> mFooters = new ArrayList<>();

private int mManagerType;
private RecyclerView.LayoutManager mManager;
private IRecyclerViewIntermediary mIntermediary;


public RecyclerViewHeaderFooterAdapter(RecyclerView.LayoutManager manager, IRecyclerViewIntermediary intermediary){
    setManager(manager);
    this.mIntermediary = intermediary;
}

public void setLayoutManager(RecyclerView.LayoutManager manager){
    setManager(manager);
}

private void setManager(RecyclerView.LayoutManager manager){
    mManager = manager;
    if(mManager instanceof GridLayoutManager){
        mManagerType = TYPE_MANAGER_GRID;
        ((GridLayoutManager) mManager).setSpanSizeLookup(mSpanSizeLookup);
    }else if(mManager instanceof LinearLayoutManager){
        mManagerType = TYPE_MANAGER_LINEAR;
    }else if(mManager instanceof StaggeredGridLayoutManager){
        mManagerType = TYPE_MANAGER_STAGGERED_GRID;
        ((StaggeredGridLayoutManager) mManager).setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_MOVE_ITEMS_BETWEEN_SPANS);
    }else{
        mManagerType = TYPE_MANAGER_OTHER;
    }
}

public int getManagerType(){
    return mManagerType;
}

public int getGridSpan(int position){
    if(isHeader(position) || isFooter(position)){
        return getSpan();
    }
    position -= mHeaders.size();
    if(mIntermediary.getItem(position) instanceof IGridItem){
        return ((IGridItem) mIntermediary.getItem(position)).getGridSpan();
    }
    return 1;
}

private int getSpan(){
    if(mManager instanceof GridLayoutManager){
        return ((GridLayoutManager) mManager).getSpanCount();
    }else if(mManager instanceof StaggeredGridLayoutManager){
        return ((StaggeredGridLayoutManager) mManager).getSpanCount();
    }
    return 1;
}

private GridLayoutManager.SpanSizeLookup mSpanSizeLookup = new GridLayoutManager.SpanSizeLookup(){
    @Override
    public int getSpanSize(int position) {
        return getGridSpan(position);
    }
};


@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int type) {
    //if our position is one of our items (this comes from getItemViewType(int position) below)
    if(type !=  TYPE_HEADER && type != TYPE_FOOTER) {
        return mIntermediary.getViewHolder(viewGroup, type);
        //else we have a header/footer
    }else{
        //create a new framelayout, or inflate from a resource
        FrameLayout frameLayout = new FrameLayout(viewGroup.getContext());
        //make sure it fills the space
        frameLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        return new HeaderFooterViewHolder(frameLayout);
    }
}

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder vh, int position) {
    //check what type of view our position is
    if(isHeader(position)){
        View v = mHeaders.get(position);
        //add our view to a header view and display it
        prepareHeaderFooter((HeaderFooterViewHolder) vh, v);
    }else if(isFooter(position)){
        View v = mFooters.get(position-mIntermediary.getItemCount()-mHeaders.size());
        //add our view to a footer view and display it
        prepareHeaderFooter((HeaderFooterViewHolder) vh, v);
    }else {
        //it's one of our items, display as required
        mIntermediary.populateViewHolder(vh, position-mHeaders.size());
    }
}

private void prepareHeaderFooter(HeaderFooterViewHolder vh, View view){

    //if it's a staggered grid, span the whole layout
    if(mManagerType == TYPE_MANAGER_STAGGERED_GRID){
        StaggeredGridLayoutManager.LayoutParams layoutParams = new StaggeredGridLayoutManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        layoutParams.setFullSpan(true);
        vh.itemView.setLayoutParams(layoutParams);
    }

    //if the view already belongs to another layout, remove it
    if(view.getParent() != null){
        ((ViewGroup)view.getParent()).removeView(view);
    }

    //empty out our FrameLayout and replace with our header/footer
    vh.base.removeAllViews();
    vh.base.addView(view);

}

private boolean isHeader(int position){
    return(position < mHeaders.size());
}
private boolean isFooter(int position){
    return(position >= mHeaders.size() + mIntermediary.getItemCount());
}



@Override
public int getItemCount() {
    return mHeaders.size() + mIntermediary.getItemCount() + mFooters.size();
}

@Override
public int getItemViewType(int position) {
    //check what type our position is, based on the assumption that the order is headers > items > footers
    if(isHeader(position)){
        return TYPE_HEADER;
    }else if(isFooter(position)){
        return TYPE_FOOTER;
    }
    int type = mIntermediary.getItemViewType(position);
    if(type == TYPE_HEADER || type == TYPE_FOOTER){
        throw new IllegalArgumentException("Item type cannot equal "+TYPE_HEADER+" or "+TYPE_FOOTER);
    }
    return type;
}

//add a header to the adapter
public void addHeader(View header){
    if(!mHeaders.contains(header)){
        mHeaders.add(header);
        //animate
        notifyItemInserted(mHeaders.size()-1);
    }
}

//remove a header from the adapter
public void removeHeader(View header){
    if(mHeaders.contains(header)){
        //animate
        notifyItemRemoved(mHeaders.indexOf(header));
        mHeaders.remove(header);
    }
}

//add a footer to the adapter
public void addFooter(View footer){
    if(!mFooters.contains(footer)){
        mFooters.add(footer);
        //animate
        notifyItemInserted(mHeaders.size()+mIntermediary.getItemCount()+mFooters.size()-1);
    }
}

//remove a footer from the adapter
public void removeFooter(View footer){
    if(mFooters.contains(footer)) {
        //animate
        notifyItemRemoved(mHeaders.size()+mIntermediary.getItemCount()+mFooters.indexOf(footer));
        mFooters.remove(footer);
    }
}

//our header/footer RecyclerView.ViewHolder is just a FrameLayout
public static class HeaderFooterViewHolder extends RecyclerView.ViewHolder{
    FrameLayout base;
    public HeaderFooterViewHolder(View itemView) {
        super(itemView);
        base = (FrameLayout) itemView;
    }
}

}

Answer 1

I solved this problem adding a new type to my adapter for the header. Look at this example: https://stackoverflow.com/a/26573338/1949163.

After that, to make the header span all columns I created a new LayoutParams and set full span to true in the adapter implementation:

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof CommonItemViewHolder) {
        ...
    } else if (holder instanceof HeaderViewHolder) {
        ...
        StaggeredGridLayoutManager.LayoutParams layoutParams = new StaggeredGridLayoutManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        layoutParams.setFullSpan(true);
        holder.itemView.setLayoutParams(layoutParams);
    }
}