the problem i have is when i click a chekbox and make the listview scroll-up the selected checkbox change or sometimes if a select the first checkbox so the last checkbox is selected too. I know my English is not good enough yet, sorry about it. Any help appreciated.
import java.util.ArrayList;
import java.util.Hashtable;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
public class MyListAdapter extends BaseAdapter{
public static class ViewHolder {
public CheckBox chkb = null;
}
private LayoutInflater mInflater;
private ArrayList<MyListAdapterItem> myListAdapterItems = null;
private Hashtable<Object, Object> items = null;
private boolean selectAll = false;
private boolean readOnly = false;
public MyListAdapter(Context context, ArrayList<MyListAdapterItem> myListAdapterItems, boolean selectAll, boolean readOnly) {
mInflater = LayoutInflater.from(context);
this.myListAdapterItems = myListAdapterItems;
this.selectAll = selectAll;
this.readOnly = readOnly;
items = new Hashtable<Object, Object>();
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.chkb_fila, null);
viewHolder = new ViewHolder();
viewHolder.chkb = (CheckBox) convertView.findViewById(R.id.chkbCultivo);
convertView.setTag(viewHolder);
}else {
viewHolder = (ViewHolder) convertView.getTag();
}
items.put(myListAdapterItems.get(position), viewHolder.chkb);
viewHolder.chkb.setText(myListAdapterItems.get(position).getDescription());
if(selectAll){
viewHolder.chkb.setChecked(true);
}
if(readOnly){
viewHolder.chkb.setEnabled(false);
}
return convertView;
}
public int getCount() {
return myListAdapterItems.size();
}
public Object getItem(int position) {
return myListAdapterItems.get(position);
}
public long getItemId(int position) {
return position;
}
/**
* @return the myListItems
*/
public ArrayList<MyListAdapterItem> getMySelectedListItems() {
ArrayList<MyListAdapterItem> listSelectedItems = new ArrayList<MyListAdapterItem>();
CheckBox tmpCheckBox = null;
for(int i=0; i<items.size(); i++){
tmpCheckBox = (CheckBox) items.get(myListAdapterItems.get(i));
if(tmpCheckBox.isChecked()){
listSelectedItems.add(myListAdapterItems.get(i));
}
}
return listSelectedItems;
}
}
Problem is that
getViewmethod reuses the views, thus you must make sure to update the checkboxs’ states inside that method; that also implies that you must save that state somewhere.