包含复选框和文本的列表视图在滚动时重置 [英] Listview containing checkbox and text is getting reset on scrolling
问题描述
我已经绘制了一个带有 ListView 和标题的自定义导航抽屉，但是当我滚动列表时，列表中的复选框没有被选中.
I have drawn a customized navigation drawer with ListView and header but when i scroll the List the checkbox in the List are getting unchecked.
其次，当我单击标题部分中的重置按钮时，我希望 Listview 中的所有复选框都被取消选中.我一直在尝试使其正常工作，但无法找到任何解决方案..
Secondly when i click on the reset button in the header part I want that all the checkbox in the Listview should get get unchecked. I have been trying this to get it working but unable to find any solution..
片段是
public class NavigationDrawer extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.filter_navigation_drawer, container,false);
drawerListView= ( ListView ) view.findViewById( R.id.listDrawer );
drawerListView.setOnItemClickListener(new FilterDrawerItemClickListener());
dataList.add(new FilterDrawerItem("sample1",true));
dataList.add(new FilterDrawerItem("sample2",true));
dataList.add(new FilterDrawerItem("sample3",true));
dataList.add(new FilterDrawerItem("sample4",true));
dataList.add(new FilterDrawerItem("sample5",true));
dataList.add(new FilterDrawerItem("sample2",true));
dataList.add(new FilterDrawerItem("sample2",true));
dataList.add(new FilterDrawerItem("sample2",true));
dataList.add(new FilterDrawerItem("sample2",true));
adapter = new FilterCustomDrawerAdapter(getActivity(), R.layout.drawer_filter,dataList,drawerStatus);
drawerListView.setAdapter(adapter);
adapter.getFilterList();
resetBtn = (TextView)view.findViewById(R.id.filterby_reset);
if(resetBtn != null){
resetBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
application.setFilterStatus("reset");
for(int i=0; i<dataList.size(); i++){
dataList.get(i).setCheckBoxId(false);
}
adapter.notifyDataSetChanged();
// this.onCreateView();
}
});
}
return view;
}
}
FilterCustomDrawerAdapter.java
public class FilterCustomDrawerAdapter extends ArrayAdapter<FilterDrawerItem> {
Context context;
List<FilterDrawerItem> drawerItemList;
int layoutResID;
int item = 0;
String status;
List<Integer> filterList = new ArrayList<Integer>();
DrawerStatus drawerStatus;
StataApplication application = StataApplication.getInstance();
HashMap<Integer, Boolean> checked; // newly added code
public FilterCustomDrawerAdapter(Context context, int layoutResourceID,
List<FilterDrawerItem> listItems,DrawerStatus drawerStatus) {
super(context, layoutResourceID, listItems);
this.context = context;
this.drawerItemList = listItems;
this.layoutResID = layoutResourceID;
this.drawerStatus = drawerStatus;
checked = new HashMap<Integer, Boolean>(getCount());
}
public FilterCustomDrawerAdapter(Context context, int layoutResourceID,
List<FilterDrawerItem> listItems) {
super(context, layoutResourceID, listItems);
this.context = context;
this.drawerItemList = listItems;
this.layoutResID = layoutResourceID;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final FilterDrawerItemHolder drawerHolder;
View view = convertView;
if (view == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
drawerHolder = new FilterDrawerItemHolder();
view = inflater.inflate(layoutResID, parent, false);
drawerHolder.ItemName = (TextView) view.findViewById(R.id.drawer_filterName);
drawerHolder.checkBox = (CheckBox) view.findViewById(R.id.drawer_cbox);
view.setTag(drawerHolder);
} else {
drawerHolder = (FilterDrawerItemHolder) view.getTag();
}
FilterDrawerItem dItem = (FilterDrawerItem) this.drawerItemList.get(position);
drawerHolder.ItemName.setText(dItem.getItemName());
TextView resetView = (TextView)view.findViewById(R.id.filterby_reset);
CheckBox checkBox = (CheckBox) view.findViewById(R.id.drawer_cbox);
// Newly added code
Boolean isChecked = checked.get(position);
checkBox.setChecked(isChecked == null ? false : isChecked);
// if(application.getFilterStatus() != null) {
if(checkBox.isChecked()){
drawerHolder.checkBox.setChecked(false);
}
// }
checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
if (isChecked) {
filterList.add(new Integer(position));
checked.put(position, true);
} else {
filterList.remove(new Integer(position));
checked.put(position, false);
}
}
});
drawerHolder.checkBox.setTag(position);
Log.d("FILTER_LIST_SIZE",String.valueOf(filterList.size()));
return view;
}
private static class FilterDrawerItemHolder {
TextView ItemName;
CheckBox checkBox;
}
public List<Integer> getFilterList(){
return filterList;
}
}
在下图中，当我滚动列表时，如果我选中了复选框 sample1 和 sample 2，它在滚动时将变为未选中状态.并且在单击标题中的重置按钮时，我希望取消选中所有复选框.无法让这个工作......
In the image below when I scroll the list and if i make the checkbox sample1 and sample 2 checked it becomes unchecked on scrolling. and also on clicking reset button in the header i want all my checkbox to be unchecked.. Not able to get this working ...
更新 1
resetBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
List<FilterDrawerItem> adapterDataList = adapter.getDrawerItemList();
for(int i=0; i<adapterDataList.size(); i++){ // At this place i am getting the size as 9
adapterDataList.get(i).setCheckBoxId(false);
}
adapter.setDrawerItemList(adapterDataList);
adapter.notifyDataSetChanged();
}
});
推荐答案
这是因为在 ListView 中循环使用了视图.您应该创建一些 HashMap:
It because of recycling use of views in ListView. You should create some HashMap:
HashMap<Integer, Boolean> checked;
然后在您的构造函数中执行以下操作:
Then in your constructor do this:
checked = new HashMap<Integer, Boolean>(getCount());
在复选框上设置 OnCheckedChangeListener 后，并在事件方法中执行以下操作:
After set OnCheckedChangeListener on your checkboxes, and in event method do this:
checked.put(position, yourCheckBoxCheckedState);
在 getView() 方法中这样做:
And in getView() method do this:
Boolean isChecked = checked.get(position);
checkBox.setChecked(isChecked == null ? false : isChecked)
试试这个，我觉得应该会有帮助
Try this, I think it should help
更新
resetBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
adapter.deselectAll();
}
});
然后在适配器创建方法中:
Then in adapter create method:
public void deselectAll() {
checked = new HashMap<Integer, Boolean>(getCount());
notifyDataSetChanged();
}
这篇关于包含复选框和文本的列表视图在滚动时重置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
