现象：listview 中，如果有10项，其中手机屏幕显示1-6项，其余的7-10项在屏幕中不可见，得向下滚动后才能看到，这个时候，如果选中1、2项，再滚动到7-10项，之后再滚动回来1-6项，就发现1、2项并未被选中。

解决方法: 编写自定义的Adapter

 public class TestAdapter extends ArrayAdapter<String> {
     private int resource;
     private LayoutInflater inflater;
     private boolean[] checks; //用于保存checkBox的选择状态

     public TestAdapter(Context context, int resource, List<String> list) {
         super(context, resource, list);
         checks = new boolean[list.size()];
         this.resource = resource;
         inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         ViewHolder holder = null;
         if(convertView == null){
             convertView = inflater.inflate(resource, null);
             holder = new ViewHolder();
             holder.title = (TextView) convertView.findViewById(R.id.title);
             holder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox);
             convertView.setTag(holder);
         }else {
             holder = (ViewHolder) convertView.getTag();
         }
         holder.title.setText(getItem(position));
         final int pos  = position; //pos必须声明为final
         holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
             @Override
             public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                 checks[pos] = isChecked;
             }});
         holder.checkBox.setChecked(checks[pos]);
         return convertView;
     }
     static class ViewHolder {
         TextView title;
         CheckBox checkBox;
     }
 }