@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.

    int layoutId = R.layout.list_item;
    int spanCount = 2;
    switch (item.getItemId()) {
        case R.id.linearVertical:  // Vertical scrollable using LinearLayoutManager.
            recyclerView.setLayoutManager(new LinearLayoutManager(this));
            break;
        case R.id.linearHorizontal:  // Horizontal scrollable using LinearLayoutManager.
            layoutId = R.layout.list_item_horizontal;
            recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
            break;
        case R.id.gridviewVertical:  // Vertical scrollable using GridLayoutManager.
            recyclerView.setLayoutManager(new GridLayoutManager(this, spanCount));
            break;
        case R.id.gridviewHorizontal:  // Horizontal scrollable using GridLayoutManager.
            layoutId = R.layout.list_item_horizontal;
            recyclerView.setLayoutManager(new GridLayoutManager(this, spanCount, LinearLayoutManager.HORIZONTAL, false));
            break;
        case R.id.staggeredGridviewVertical:  // Vertical scrollable using StaggeredGridLayoutManager.
            recyclerView.setLayoutManager(new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.VERTICAL));
            break;
        case R.id.staggeredGridviewHorizontal:  // Horizontal scrollable using StaggeredGridLayoutManager.
            layoutId = R.layout.list_item_horizontal;
            recyclerView.setLayoutManager(new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.HORIZONTAL));
            break;
    }
    adapter = new AnimalAdapter(animalList, layoutId);
    recyclerView.setAdapter(adapter);

    return super.onOptionsItemSelected(item);
}