Dynamically change the number of columns of a GridLayoutManager

Question

I am actually using a GridLayoutManager with two columns in my app and I would like to have one column depending on the view type used.

Here is the code I have in the me

Answer 1

i was use an checkBox for changing my Layout manager columns. you should use this to change GridLayoutManager columns . here is code :

 checkBox = findViewById(R.id.change_manager);

    checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (checkBox.isChecked()) {
                layoutManager.setSpanCount(2);
                isLayoutChange = true;
            } else {
                isLayoutChange = false;
                layoutManager.setSpanCount(3);
            }
        }
    });

and boolean for checking layoutManager Changes in onResume() , onRestart() and onPause() method. use it like this :

  if (isLayoutChange) {
        layoutManager.setSpanCount(2);
    } else {
        layoutManager.setSpanCount(3);
    }

Answer 2

mGridLayoutManager = new GridLayoutManager(mContext, 2);
mGridLayoutManager.setSpanSizeLookup(onSpanSizeLookup);    

/**
 * Helper class to set span size for grid items based on orientation and device type
 */
GridLayoutManager.SpanSizeLookup onSpanSizeLookup = new GridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        return mHomeListAdapter.getItemViewType(position) == TYPE_PREMIUM ? 2 : 1;
    }
};

Answer 3

If I understand your question, you would like to let premium-type Views span 2 columns instead of 1? That's possible by setting a custom SpanSizeLookup with setSpanSizeLookup(SpanSizeLookup).