Android: Chaotic Selection In Listview

In my application I have a ListView and ArrayAdapter. When I select some one element in ListView I can see also few more selected elements. Furthermore, when I scroll elements in

Solution 1:

Wow, its the first hurdle you face in your first ListView. Don't worry. First of all understand how ListView works, its important. Otherwise you can't master ListView. In simplest word: ListView creates few row Views and utilizes them for every row. So if you have have 50 elements in your ListView then may be only 10 times getView() was called with convertView being null. So in short if you don't update the state of a view inside getView() method for every position, it will really be a chaos. Also please use View Holder Pattern in your ListView. It will drastically increase scrolling and will utilize less resources. More on View Holder Pattern http://www.jmanzano.es/blog/?p=166

UPDATE:

I said

So in short if you don't update the state of a view inside getView() method for every position, it will really be a chaos.

privateSparseBooleanArraycheckedPositions=newSparseBooleanArray();// class variable


listView.setOnItemClickListener(newOnItemClickListener() {

        @OverridepublicvoidonItemClick(AdapterView<?> parent, View view,
                int position, long id) {
             if(checkedPositions.get(position)){
                 checkedPositions.put(position, false);
             }else{
                 checkedPositions.put(position, true);
             }
        }

    });

now in your getView()

((CheckedTextView)convertView.findViewById(R.id.checkedTextView)).setChecked(checkedPositions.get(position));

adjust this code according to your need. OR you can have a boolean variable in your BinLocation to maintain checked positions. But remember and understand the point of maintaining state inside getView().