Depends on the behavior that you want. Some questions can more than one item be expanded at a time? Do you want the views to be paged (snap into place) or smooth scroll them?
One Suggestion I have is to make a custom view for the individual cells. Then add them programmatically to a HorizontalScrollView Object.
HorizontalScrollView hsv = new HorizontalScrollView(activity);
LinearLayout hll = new LinearLayout(activity);
hll.setOrientation(LinearLayout.HORIZONTAL);
for(int i=0;i<items.length();i++){
hsv.addView(new CustomExpandView(item));
}
The CustomExpandView would be used for your cells and could be something like this...
public class CustomExpandView extends RelativeLayout implements OnClickListener {
MyActivity mActivity = null;
ImageView ivImage, ivOverImage;
RelativeLayout rlView;
public CustomExpandView(Context context) {
super(context);
initialize();
}
public CustomExpandView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
public void initialize() {
mActivity = (MyActivity) this.getContext();
LayoutInflater inflater = (LayoutInflater) mActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.custom_cell_expand, this, true);
//you can initialize subviews here
rlView = (RelativeLayout) getChildAt(0);
ivImage = (ImageView) rlView.getChildAt(0);
ivOverImage = (ImageView) rlView.getChildAt(1);
rlView.setOnFocusChangeListener(new OnFocusChangeListener(){
@Override
public void onFocusChange(View v, boolean hasFocus) {
LinearLayout expand = v.findViewById(R.id.view_i_want_to_expand);
if(hasFocus)
expand.setVisibility(View.VISIBLE);
else
expand.setVisibility(View.GONE);
}
});
}