javascript – 包含复选框和文本的Listview在滚动时重置

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,列表中的复选框将被取消选中.

其次,当我点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取消选中.我一直试图让它工作,但无法找到任何解决方案..

这些片段是

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;
    }
}

在下面的图像中,当我滚动列表时,如果我选中了复选框sample1和样本2,则在滚动时将取消选中它.
并且在点击标题中的重置按钮时,我希望取消选中所有复选框.
无法使这个工作……

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();
                }
            });

解决方法:

它因为在ListView中回收使用视图.你应该创建一些HashMap：

HashMap<Integer, Boolean> checked;

然后在构造函数中执行以下操作：

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

在复选框上设置OnCheckedChangeListener之后,在事件方法中执行以下操作：

checked.put(position, yourCheckBoxCheckedState);

在getView()方法中执行以下操作：

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

试试这个,我认为应该有所帮助

UPDATE

resetBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                adapter.deselectAll();
            }
        });

然后在适配器创建方法：

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

标签：android,javascript,android-navigation
来源： https://codeday.me/bug/20191003/1850289.html