包含复选框和文本的列表视图在滚动时被重置

Question

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，列表中的复选框被取消选中。

其次，当我单击标题部分中的重置按钮时，我希望 Listview 中的所有复选框都应该被取消选中。我一直在尝试使其正常工作，但找不到任何解决方案..

sn-ps 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，如果我选中复选框 sample1 和 sample 2，它在滚动时将变为未选中。 并且在单击标题中的重置按钮时，我希望取消选中我的所有复选框。 无法让这个工作......

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();
                }
            });

Answer 1

这是因为 ListView 中视图的循环使用。你应该创建一些 HashMap：

HashMap<Integer, Boolean> checked;

然后在你的构造函数中这样做：

checked = new HashMap<Integer, Boolean>(getCount());

在您的复选框上设置 OnCheckedChangeListener 后，在事件方法中执行以下操作：

checked.put(position, yourCheckBoxCheckedState);

在 getView() 方法中这样做：

Boolean isChecked = checked.get(position);
checkBox.setChecked(isChecked == null ? false : isChecked)

试试这个，我觉得应该有帮助

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：

 public void deselectAll() {
   checked = new HashMap<Integer, Boolean>(getCount());
   notifyDataSetChanged();
 }

Answer 2

在您的 FilterDrawerItem 类中，创建一个布尔变量 isChecked。

现在在您的适配器类中，编写如下内容：

if(dItem.isChecked){
    drawerHolder.checkBox.setChecked(true);
}
else{
    drawerHolder.checkBox.setChecked(false);
}

在你的OnCheckedChangeListener:

if (isChecked) {
    //your other code
    dItem.setChecked(true);
    notifyDataSetChanged();
} else {
    //your other code
    dItem.setChecked(false);
    notifyDataSetChanged();
}

@Orest Savchak 的回答也是正确的，但是跟踪 POJO 类中的复选框将帮助您稍后检索选中的项目，并且还可以更轻松地做其他事情，比如您想在单击“重置”时取消选中所有复选框按钮。为此，在onClick() 的重置按钮上，您只需要这样做：

for(int i=0; i<FilterDrawerItem.size; i++){
    FilterDrawerItem.get(i).setChecked(false);
}
adapterObject.notifyDataSetChanged();

编辑 1：

在您的适配器中为drawerItemList 创建getter setter，然后在重置按钮的onClick() 中，代替dataList，执行以下操作：

List<FilterDrawerItem> adapterDataList=adapter.getDataList();
for(int i=0; i<adapterDataList.size(); i++){
    adapterDataList.get(i).setCheckBoxId(false);
}
adapter.setDataList(adapterDataList);
adapter.notifyDataSetChanged();