notifyDataSetChanged() 在 BaseAdapter 中无法使用 android 中的复选框列表

Posted 2023-03-05

【中文标题】notifyDataSetChanged() 在 BaseAdapter 中无法使用 android 中的复选框列表

【英文标题】：notifyDataSetChanged() is not working in BaseAdapter with Checkbox list in android

【发布时间】：2018-01-18 05:17:06

【问题描述】：

https://i.stack.imgur.com/vUpUM.png

我将列表视图和复选框作为列表项。正如您在图像描述中看到的，Action Master 是父级，Add,Delete 是子级。父级和子级由编码分隔。现在选中 Action Master，添加和删除也应该选中，反之亦然。一切正常好吧，但主要问题是当我们单击 Action Master 时，整个列表应该刷新，应该检查 ADD 和 DELETE，但它没有出现在 UI 上，简而言之，我正在登录但没有在 UI 中获取。

这是我填写时的代码：

dataAdapter = new MyCustomAdapter(AddRolePermission.this, listPageActionMaster);
listView.setAdapter(dataAdapter);

这里是自定义适配器的代码：

class MyCustomAdapter extends BaseAdapter


    AddRolePermission addRolePermission;
    List<ClsPageActionMaster> list_role_master;


    public MyCustomAdapter(AddRolePermission addRolePermission, List<ClsPageActionMaster> lstDemo) 
        this.addRolePermission=addRolePermission;
        this.list_role_master=lstDemo;
    

    @Override
    public int getCount() 
        return list_role_master.size();
    

    @Override
    public Object getItem(int position) 
        return position;
    

    @Override
    public long getItemId(int position) 
        return position;
    

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) 

        if (convertView == null) 
            ///
            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = vi.inflate(R.layout.permissions_checkbox, null);



            CheckBox checkBox1 = (CheckBox) convertView.findViewById(R.id.checkBox1);
            TextView pageid = (TextView) convertView.findViewById(R.id.pageid);

            ClsPageActionMaster ObjPageAction = new ClsPageActionMaster();
            ObjPageAction = list_role_master.get(position);


            Log.v("RolePermissionData", "BEFORE CHECKED");
            Log.v("RolePermissionData", "CheckBox-" + String.valueOf(ObjPageAction.getSelected()));
            Log.v("RolePermissionData", "PageID-" + String.valueOf(ObjPageAction.getPageid()));
            Log.v("RolePermissionData", "PageName-" + String.valueOf(ObjPageAction.getPage_name()));
            Log.v("RolePermissionData", "type" + String.valueOf(ObjPageAction.getType()));
            Log.v("RolePermissionData", "position" + String.valueOf(position));
            Log.v("RolePermissionData", "ActionName" + String.valueOf(ObjPageAction.getAction_name()));


            if (ObjPageAction.getType().toString().equalsIgnoreCase("parent")) 
                checkBox1.setText("  " + ObjPageAction.getPage_name());
                checkBox1.setTypeface(null, Typeface.BOLD);

             else 
                checkBox1.setText("        " + ObjPageAction.getAction_name());
            
            checkBox1.setChecked(ObjPageAction.getSelected());
            pageid.setText(String.valueOf(ObjPageAction.getPageid()));
            checkBox1.setTag(String.valueOf(position));

            checkBox1.setOnClickListener(new View.OnClickListener() 
                public void onClick(View v) 
                    CheckBox cb = (CheckBox) v;

                    Toast.makeText(AddRolePermission.this, cb.getText().toString()+"-"+cb.isChecked(), Toast.LENGTH_SHORT).show();

                    Integer _POSSITION = Integer.parseInt(String.valueOf(cb.getTag()));
                    ClsPageActionMaster _ObjAction = list_role_master.get(_POSSITION);

                    //check is parent? or not
                    //if yes then find all chied and check them if not
                    if (_ObjAction.getType().equalsIgnoreCase("parent")) 

                        Log.v("CHECKBOXlist", "parent true -" + String.valueOf(_ObjAction.getSelected()));
                        Integer _parentPageID = _ObjAction.getPageid();
                        Log.v("CHECKBOXlist", "_parentPageID -" + String.valueOf(_parentPageID));
                        for (ClsPageActionMaster ObjPageActionMaster : list_role_master) 
                            if (_parentPageID == ObjPageActionMaster.getPageid()) 
                                Log.v("CHECKBOXlist", "pageid == actionPagID -" + String.valueOf(_ObjAction.getPageid()));
                                Log.v("CHECKBOXlist", "_parentPageID -" + String.valueOf(ObjPageActionMaster.getPageid()));
                                ObjPageActionMaster.setSelected(cb.isChecked());
                                list_role_master.set(list_role_master.indexOf(ObjPageActionMaster), ObjPageActionMaster);
                            
                        

                        dataAdapter.notifyDataSetChanged();
                     else 
                        Log.v("CHECKBOXlist", "CHK_CHECKED-" + String.valueOf(_ObjAction.getSelected()));
                        _ObjAction.setSelected(cb.isChecked());
                        list_role_master.set(_POSSITION, _ObjAction);
                    


                    Log.v("CHECKBOXlist", "AFTER CHECKED");
                    Log.v("CHECKBOXlist", "CHK_POSITION-" + String.valueOf(_POSSITION));
                    Log.v("CHECKBOXlist", "CHK_ID-" + String.valueOf(_ObjAction.getId()));
                    Log.v("CHECKBOXlist", "chk_name-" + String.valueOf(_ObjAction.getAction_name()));
                    Log.v("CHECKBOXlist", "type" + String.valueOf(_ObjAction.getType()));
                    Log.v("CHECKBOXlist", "Position" + String.valueOf(position));
                    Log.v("CHECKBOXlist", "CHK_CHECKED-" + String.valueOf(_ObjAction.getSelected()));
                
            );

        
        return convertView;
    

即使我已经写了 dataAdapter.notifyDataSetChanged(); 仍然没有刷新我已经在适配器中编写了复选框单击事件，所以我该如何刷新这就是问题，通过每个复选框单击，它应该是刷新，以便我可以获得所需的输出。 感谢您的帮助。谢谢

【问题讨论】：

你不需要声明自定义适配器，您必须在复选框单击事件上修改列表（在适配器中传递），并在列表中更新后使用 dataAdapter.notifyDataSetChanged()。希望它对你有用

你能告诉我一些代码吗，因为我没有得到...... @GuptaShashwat

【参考方案1】：

假设你有一个列表和适配器：

ArrayList<String> my_list=new ArrayList<>();
my_list.add(contents);
ArrayAdapter<> my_adapter = new ArrayAdapter<>(AgentCreateIntimation.this, android.R.layout.simple_spinner_dropdown_item, my_list);

找到你的复选框

CheckBox ChkBx = ( CheckBox ) findViewById( R.id.checkbox );
ChkBx.setOnCheckedChangeListener(new OnCheckedChangeListener()

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
    
        if ( isChecked )
        
my_list.add(contents);
my_adapter.notifyDataSetChanged()
            // perform logic
        

    
);