Question

I have Custom List to display image with it’s name like below…

 public class LazyAdapter extends BaseAdapter {

 private Activity activity;
 private String[] data;
 private static LayoutInflater inflater=null;
 public ImageLoader imageLoader; 

 public LazyAdapter(Activity a, String[] d) {
    activity = a;
    data=d;
    inflater =  
   (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    imageLoader=new ImageLoader(activity.getApplicationContext());
 }

 public int getCount() {
    return data.length;
 }

 public Object getItem(int position) {
    return position;
 }

 public long getItemId(int position) {
    return position;
 }

 public static class ViewHolder{
    public TextView text;
    public ImageView image,yesimage;

 }

 public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    ViewHolder holder;
    if(convertView==null){
        vi = inflater.inflate(R.layout.item, null);
        holder=new ViewHolder();
        holder.text=(TextView)vi.findViewById(R.id.text);;
        holder.image=(ImageView)vi.findViewById(R.id.image);
        holder.yesimage=(ImageView)vi.findViewById(R.id.selectedyes);
        vi.setTag(holder);
    }
    else
        holder=(ViewHolder)vi.getTag();



    holder.text.setText("item "+position);
    holder.image.setTag(data[position]);
    holder.yesimage.setTag(data[position]);

    imageLoader.DisplayImage(data[position], activity, holder.image,holder.yesimage);
    return vi;
}
}

for this list I’m trying to set,

      list=(ListView)findViewById(R.id.list);
      adapter=new LazyAdapter(this, mStrings);//mstrings is array
      list.setAdapter(adapter);
      list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

where as I’m able to get all checked list items using,

      list.setOnItemClickListener(new OnItemClickListener(){

        TextView selected=(TextView)findViewById(R.id.selected);
        final ArrayList<String> years = new ArrayList<String>();

         @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {

            SparseBooleanArray checked = list.getCheckedItemPositions();
                    if(checked.get(arg2))
                    {
                         years.add(""+mStrings[arg2]+"\n");
                    }
                    else
                    {
                     years.remove("    "+mStrings[arg2]+"\n");
                    }

             if(years.size()!=0)
                 selected.setText(years.toString());
             else
             selected.setText("You Have Nothing in Cart");
             }});

but nothing indicates in list that the selected item is checked, it just considers clicked item as selected,Here I cannot use,

    list.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice, mStrings));
list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

Because my list Extends BaseAdapter,

I want to put the checkbox for every row in the list, to ensure that the item is checked once I check that list item, how can I do that…?

Answer 1

Take CheckBox inside the ViewHolder and implement setOnCheckedChangeListener for each check box.

for example:

holder.checkbox = ( CheckBox ) vi.findViewById( R.id.checkbox );
holder.checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
    {
        if ( isChecked )
        {
            // perform logic
        }

    }
});