我知道这个问题一再被问到,但我还没有找到一个真正帮助我的建议.每当列表向下滚动时,该复选框都将被取消选中.是的,我正在使用一个布尔数组来存储值,但这仍然无法解决问题.这是我的代码请为此建议一个解决方案.谢谢.
public View getView(final int position,View convertView,ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
final boolean[] itemChecked=new boolean[30];
LayoutInflater inflater = context.getLayoutInflater();
if(convertView==null)
{
convertView = inflater.inflate(R.layout.custom_list,null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView.findViewById(R.id.title_text);
holder.txtViewDescription = (TextView) convertView.findViewById(R.id.description_text);
holder.cb=(CheckBox) convertView.findViewById(R.id.cb);
convertView.setTag(holder);
}
else
{
holder=(ViewHolder)convertView.getTag();
}
holder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
// TODO Auto-generated method stub
itemChecked[position] = isChecked;
if(itemChecked[position])
{
holder.cb.setChecked(true);
}
else
{
holder.cb.setChecked(false);
}
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
holder.cb.setChecked(itemChecked[position]);
holder.txtViewDescription.setFocusable(false);
holder.txtViewTitle.setFocusable(false);
return convertView;
}
}
解决方法
每当需要绘制以前不可见的列表项时调用getView().由于每次调用此方法时都会重新创建itemChecked [],因此您将不会选中新复选框,并为每个生成的视图选择不同的数组. (Java中的final不会像C那样使该领域独一无二)
最简单的解决方法是让itemChecked成为一个类成员,并根据该选项设置/恢复复选框状态.
最简单的解决方法是让itemChecked成为一个类成员,并根据该选项设置/恢复复选框状态.
public class MyListAdapter extends ArrayAdapter<Object> {
private final boolean[] mCheckedState;
private final Context mContext;
public MyListAdapter(Context context,int resource,int textViewResourceId,List<Object> objects) {
super(context,resource,textViewResourceId,objects);
mCheckedState = new boolean[objects.size()];
mContext = context;
}
@Override
public View getView(int position,ViewGroup parent) {
// simplified to just a CheckBox
// ViewHolder and OnCheckedChangeListener stuff left out
CheckBox result = (CheckBox)convertView;
if (result == null) {
result = new CheckBox(mContext);
}
result.setChecked(mCheckedState[position]);
return result;
}
}
