android : checkboxes in a ListView ( strange behaviour of selected element)

Question

I found here and here similar issues, but the problem is slightly different.

In a ListView, I try to put an adapter (extends from base Adapter) which contents checkb

Answer 1

I too had the same problem. I solved it using the following method.
I created a bean class to set the checked property of checkbox and used ArrayAdapter. The ArrayAdpater extends the bean class.

Bean Class

public class MCSSCheckState
{
    private boolean isChecked;
    public boolean getIsChecked()
    {
        return isChecked;
    }
    public void setIsChecked(boolean isChecked)
    {
        this.isChecked = isChecked;
    }
}

Java Class

ArrayList<MCSSCheckState> mTitleList = new ArrayList<MCSSCheckState>();
MCSSCheckState check_state=new MCSSCheckState();
check_state.setIsChecked(false);
mTitleList.add(i, check_state);
ListAdapters adapter = new ListAdapters(this,R.id.camTitleTextView, mTitleList);
ListView mListView = (ListView) findViewById(R.id.cameraListView);
mListView.setAdapter(adapter);

Adapter Class

private class ListAdapters extends ArrayAdapter<MCSSCheckState>
{
    private ArrayList<MCSSCheckState> items;
    private int position;       
    public ListAdapters(Context context, int textViewResourceId,
                        ArrayList<MCSSCheckState> mTitleList) 
                        {
                            super(context, textViewResourceId, mTitleList);
                            this.items = mTitleList;
                        }
                        @Override
                        public View getView(int position, View convertView, ViewGroup parent)
                        {
                            View v = convertView;
                            this.position = position;
                            if (v == null)
                            {
                                LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                                v = inflater.inflate(R.layout.camerslistinflater, null);
                            }
                            MCSSCheckState o = (MCSSCheckState) items.get(position);
                            if (o != null)
                            {
                                checkBox = (CheckBox) v.findViewById(R.id.checkBox1);
                                checkBox.setTag(position);
                                checkBox.setChecked(o.getIsChecked());
                                checkBox.setOnClickListener(new OnClickListener()
                                {
                                     @Override
                                     public void onClick(View v)
                                     {
                                         MCSSCheckState obj = (MCSSCheckState) items.get(Integer.parseInt(v.getTag().toString()));
                                         obj.setIsChecked(((CheckBox)v).isChecked());
                                         items.set(Integer.parseInt(v.getTag().toString()), obj);                       
                                     }
                                 });
                             }
                             return v;
                         });
}

Hope this helps you.

Answer 2

In your getView you have to something like this (this code is give you an idea how it will work in your case):

ListView lv = ((ListActivity)context).getListView();
// Containing all check states
SparseBooleanArray sba = lv.getCheckedItemPositions();

CheckBox cb = (CheckBox) convertView.findViewById(R.id.yourcheckbox);

cb.setChecked(false);

if(sba != null)
  if(sba.get(position))
     cb.setChecked(true);

That said this what you need on the Activity side.

You have make your ListView to multi-selection mode by android:choiceMode in xml or using setChoiceMode. You check box should be non-clickable and non-focusable.

You have to remove your onClick listener on buttons. Whatever you doing in onClick of button, you have to add that logic to the onListItemClick of ListActivtiy.