[英]How come the position of items in my checklistview change after I check on some items
I'm coding a really basic check list app. 我正在编写一个非常基本的清单应用程序。 The user can add tasks and then check them off. 用户可以添加任务,然后将其选中。 But for some reason, when the user check an item - the position in the list changes. 但是由于某种原因,当用户检查项目时,列表中的位置会更改。 Here are a couple of screenshots to show what I mean. 这是几个截图,以显示我的意思。 The code of my ListAdapter follows: 我的ListAdapter的代码如下:
(The Number at the end of the list item is it's position. eg Do Laundry [False]0 is item at position 0.) (列表项末尾的数字是其位置。例如,“洗衣服[False] 0是位置0处的项目。”)
CODE 码
class TaskListAdapter extends ArrayAdapter<Task> implements OnCheckedChangeListener
{
Activity context;
View recycledView;
ViewAccessor viewAccessor;
CheckBox checkbox;
int position;
public TaskListAdapter(Activity context, int resource, int textViewResourceId, List<Task> objects) {
super(context, resource, textViewResourceId, objects);
this.context = context;
}
public View getView(int position, View convertView, ViewGroup parent) {
this.recycledView = convertView;
if(recycledView == null)
{
LayoutInflater inflater = context.getLayoutInflater();
recycledView = inflater.inflate(R.layout.checkview, null);
this.viewAccessor = new ViewAccessor(recycledView);
this.recycledView.setTag(this.viewAccessor);
this.checkbox = (CheckBox) recycledView.findViewById(R.id.cbTaskCompleted);
this.checkbox.setOnCheckedChangeListener(this);
this.checkbox.setTag((Integer) position);
}else
{
viewAccessor = (ViewAccessor) this.recycledView.getTag();
this.checkbox = viewAccessor.getCheckBox();
}
this.checkbox.setText( taskList.get(position).toString()+String.valueOf(position) );
this.checkbox.setChecked( taskList.get(position).isCompleted );
return recycledView;
}
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
Task taskUnderConsideration = taskList.get( (Integer) buttonView.getTag() ) ;
taskUnderConsideration.setCompleted(isChecked);
buttonView.setText(taskUnderConsideration.toString()+buttonView.getTag().toString());
}
}
class ViewAccessor
{
View v;
CheckBox cb = null;
ViewAccessor(View v)
{
this.v = v;
}
CheckBox getCheckBox()
{
if(cb==null)
cb = (CheckBox) v.findViewById(R.id.cbTaskCompleted);
return cb;
}
}
If you want to show simple row (with single TextView
and CheckBox
), I'll recommend you to use ListView
's method: 如果要显示简单的行(带有单个TextView
和CheckBox
),我建议您使用ListView
的方法:
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
It'll automatically show the (built-in) CheckBox
with the TextView
. 它将自动使用TextView
显示(内置) CheckBox
。
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