title: list view position is getting changed when scrolling on android
body: <p>I have list view [text view and check box controlls] with more data. I will choose the item from list view and display the selected items in the next activity.
  My problem is, for the example if I choose 20th and 25th item in the list view it will display some other items in the next activity. <strong>That is list view position is getting changed when scrolling.</strong>  </p>
  
  <p><strong>i am choosing an item by clicking the check box on the item. in the checkbox.setOnChanged listener i wrote code for which position is selected or not. if i choose 25th item and scroll the list view, the getview method is called and the checkbox.setonChanged method is change the selected position.</strong>  I print the logcat at last.</p>
  
  <p>My coding format:</p>
  
  <pre><code>public class ListContact extends ListActivity {
    public void onCreate(Bundle icicle){
      .....
      ArrayAdapter&lt;Model&gt; adapter = new MyCustomArrayAdapter(this,getModel());
      setListAdapter(adapter);
    }
   ....
  private List&lt;Model&gt; getModel() {
      List&lt;Model&gt; list = new ArrayList&lt;Model&gt;();
  
  Iterator&lt;String&gt; itr = constant.selectname.iterator();
      while (itr.hasNext()) {
          list.add(get(itr.next().toString()));
      }
      return list;
  }
  
  private Model get(String s) {
      return new Model(s);
  }  
  
  }
  </code></pre>
  
  <p>MyCustomArrayAdapter.java:</p>
  
  <pre><code>public class MyCustomArrayAdapter extends ArrayAdapter&lt;Model&gt; {
  
      private final List&lt;Model&gt; list;
      private final Activity context;
      constant con ;
      public MyCustomArrayAdapter(Activity context, List&lt;Model&gt; list) {
          super(context, R.layout.list_layout, list);
          this.context = context;
          this.list = list;
      }
  
      static class ViewHolder {
          protected TextView text;
          protected CheckBox checkbox;
      }
  
      @Override
      public View getView(final int position, View convertView, ViewGroup parent) {
  
  //      Log.e("getview", "getview");
          View view = null;
          if (convertView == null) {
              LayoutInflater inflator = context.getLayoutInflater();
              view = inflator.inflate(R.layout.list_layout, null);
              final ViewHolder viewHolder = new ViewHolder();
              viewHolder.text = (TextView) view.findViewById(R.id.label);
              viewHolder.checkbox = (CheckBox) view.findViewById(R.id.check);
              viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                          public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
  //                          con = new constant();
                              Model element = (Model) viewHolder.checkbox.getTag();
                              element.setSelected(buttonView.isChecked());
  //                          Log.e("MyCustomArrayAdapter.java", "selectpos array list length"+constant.selectpos.size());
                              if(isChecked==true){
                                  Log.e("check box value and position  ", element.getName());
                                  Log.e("position", ""+position);
                                  con.selectpos.set(position, 1);
  
                              }
                              else{
                                  Log.e("position unselect", ""+position +"---------"+ element.getName());
                                  con.selectpos.set(position, 0);
                              }
                          }
                      });
              view.setTag(viewHolder);
              viewHolder.checkbox.setTag(list.get(position));
          } else {
              view = convertView;
              ((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
          }
          ViewHolder holder = (ViewHolder) view.getTag();
          holder.text.setText(list.get(position).getName());
          holder.checkbox.setChecked(list.get(position).isSelected());
          return view;
      }
  }
  </code></pre>
  
  <p>logcat result:</p>
  
  <pre><code>02-08 10:44:28.142: E/check box value and position(293): AAAA  Qqq 
  02-08 10:44:28.142: E/check box value and position(293): Mobile-123
  02-08 10:44:28.152: E/position(293): 0
  
  **after scrolling the list view some other item print 0th position unselected and wrong data:**
  02-08 10:44:31.962: E/position unselect(293): 0---------F212
  02-08 10:44:31.962: E/position unselect(293): Home-232
  </code></pre>