What do you mean this little light thing in Android Studio?

this blue-green color


and how to transfer data in ListAdapter?

in aktiviti do first

AssetListAdapter<asset> adapter = new AssetListAdapter<asset>(this, (ArrayList<asset>) queryResults);
listView.setAdapter(adapter);</asset></asset></asset>

inside adapter:

private ArrayList<asset> list;

public AssetListAdapter(Context Context, ArrayList<asset> data){
 list = data;
 LInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

...

@Override
 public Asset getItem(int i) {
 return list.get(i);
}

@Override
 public View getView(int i, View convertView, ViewGroup parent) {

...

 Asset item = getItem(i);
 //and this item can not do anything, although the item.getClass() shows Asset 
}</asset></asset>

and after that I heard the opinion that the ListView is outdated and you need to go to RecycleView.
but Google says that
1) there may be problems with older versions, you need to set additional libraries. we can start it on 4.1?
2) there is some shamanism with handling clicks on items. is it?