How to set different columns for rows in android gridview

I have something similar and i solved with the new RecyclerView.

I created a Fragment with an a RecyclerView.
RecyclerView on xml:

<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/filter_subtypes" android:layout_width="match_parent" android:layout_height="match_parent" />

On your Fragment/Activity (OnViewCreated in my fragment case).
I find the RecyclerView and set an Adapter- a normal Adapter class inherit from RecyclerView.Adapter< YOUR VIEW HOLDER class >–
And then i create a GridLayoutManager

final GridLayoutManager mng_layout = new GridLayoutManager(this.getActivity(), TOTAL_CELLS_PER_ROW/*In your case 4*/);

Then i override this method to set a dynamic numbers of columns (cells)

mng_layout.setSpanSizeLookup( new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                switch( adapterSubtype.getItemViewType(position) ) {
                    case FilterSubtypesAdapter.TYPE_LOW:
                        return TOTAL_CELLS_PER_ROW;
                    case FilterSubtypesAdapter.TYPE_HIGH:
                        return 2;
                    default:
                        return -1;
                }
            }
        });
myRecyclerView.setLayoutManager(mng_layout);

With this you will get dynamic numbers of cell on your rows.

EXTRA:
Then if you are using the same view/type view on your adapter, you will get the same w & h view. You will need to create 2 xml views for TYPE_HIGH and other view for TYPE_LOW.

So, in your adapter, you need to have 2 kind of data (1 for high images and 1 for low images).
You must override this methods

@Override
public SubtypeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = null;
    if (viewType==TYPE_HIGH) {
        view = inflater.inflate(R.layout.item_image_high, parent, false);
    } else {
        view = inflater.inflate(R.layout.item_image_low, parent, false);
    }
    return new SubtypeViewHolder(view, viewType);
}

 @Override
 public int getItemViewType(int position) {
     return (list.get(position).getType()==Subtype_type.HIGH) ? TYPE_HIGH : TYPE_LOW;
 }

I hope i was clear, any problem tell me.