mainactivity.java

 btnThree.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                modelArrayList.clear();
                modelArrayList.add(new Model(R.drawable.what_hot));
                modelArrayList.add(new Model(R.drawable.what_hot));
                modelArrayList.add(new Model(R.drawable.what_hot));
                setSpanValue();

            }
        });