根据子计数展开列表视图

Question

我需要一些帮助。我正在尝试实现可扩展列表视图。我的问题是，当有超过2个子项时，如果组布局上没有文本视图和按钮可见，则只有组必须展开。请仔细阅读我的代码和附件中的图片。当有两个以上的孩子时，文本视图和按钮是可见的。

Screenshot of the menu

Menu.java

public class SubMenu extends BaseActivity {
String item;
ExpandableListView sec;
Toolbar carttoolbar;
private int lastExpandedPosition = -1;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sub_menu);
    carttoolbar = (Toolbar) findViewById(R.id.carttoolbar);
    setSupportActionBar(carttoolbar);
    assert getSupportActionBar() != null;
    final Drawable upArrow = getResources().getDrawable(R.drawable.abc_ic_ab_back_mtrl_am_alpha);
    upArrow.setColorFilter(getResources().getColor(R.color.white), PorterDuff.Mode.SRC_ATOP);
    getSupportActionBar().setHomeAsUpIndicator(upArrow);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setDisplayShowHomeEnabled(true);
    String catname = getIntent().getStringExtra("CatName");
    getSupportActionBar().setTitle(catname);
    sec = (ExpandableListView) findViewById(R.id.seondlst);
    sec.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        @Override
        public void onGroupExpand(int groupPosition) {
            if (lastExpandedPosition != -1
                    && groupPosition != lastExpandedPosition) {
                sec.collapseGroup(lastExpandedPosition);
            }
            lastExpandedPosition = groupPosition;
        }
    });
    Intent hello = getIntent();
    item = hello.getStringExtra("Catergory");
    loaditems();
}

private void loaditems() {
    String url = Constant.commonurlyell + "data_standard_item_ind_new.php?rname=standardtakeaway&id=" + item;
    Log.d("ITems", url);
    final ProgressDialog progressDialog = new ProgressDialog(this);
    progressDialog.setMessage("Loading...");
    progressDialog.show();
    JsonObjectRequest arrayRequest = new JsonObjectRequest(Request.Method.GET, url, (String) null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            ArrayList<Subitem_base> list = new ArrayList<Subitem_base>();
            ArrayList<Subitem_base_child> ch_list = new ArrayList<Subitem_base_child>();
            try {
                JSONArray itemsarray = response.getJSONArray("items");
                Map<Integer, ArrayList<Subitem_base_child>> ch_lists = new HashMap<Integer, ArrayList<Subitem_base_child>>();
                for (int i = 0; i < itemsarray.length(); i++) {
                    ch_list = new ArrayList<Subitem_base_child>();
                    JSONObject itemsobj = itemsarray.getJSONObject(i);
                    Subitem_base subitem = new Subitem_base();
                    subitem.setGroupitemname(itemsobj.getString("BaseName"));
                    JSONArray subitemsarray=itemsobj.getJSONArray("subitems");
                    for (int j = 0; j <subitemsarray.length() ; j++) {
                        JSONObject subitemsobj=subitemsarray.getJSONObject(j);
                        Subitem_base_child subitembase=new Subitem_base_child();
                        subitembase.setChilditemname(subitemsobj.getString("SubItemdesc"));
                        String pricevalue = "£";
                        subitembase.setChilditemprice(pricevalue.concat(subitemsobj.getString("SubItemprice")));
                        ch_list.add(subitembase);
                    }
                    ch_lists.put(i, ch_list);
                    subitem.setItems(ch_lists.get(i));
                    list.add(subitem);

                }
                SubItem_ExpandAdapter subexpand = new SubItem_ExpandAdapter(getApplicationContext(), list,SubMenu.this);
                int childCount=sec.getChildCount();
                Log.d("Std", String.valueOf(childCount));
                sec.setAdapter(subexpand);
                subexpand.notifyDataSetChanged();
                progressDialog.hide();

            } catch (JSONException e) {
                e.printStackTrace();
            }

        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d("SecondleveError", String.valueOf(error));
        }
    });
    arrayRequest.setRetryPolicy(new DefaultRetryPolicy(50000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
            DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    AppController.getInstance().addToRequestQueue(arrayRequest);
}

}

MenuAdapter.java

public class SubItem_ExpandAdapter extends BaseExpandableListAdapter {
Context subcontext;
private ArrayList<Subitem_base> subitem_bases;
private SharedPreferences loginPreferences;
private SharedPreferences.Editor loginPrefsEditor;
String itembasename, itemde, subtmsub, subitempri;
private Activity parentActivity;

public SubItem_ExpandAdapter(Context subcontext, ArrayList<Subitem_base> subitem_bases, Activity parentactivity) {
    this.subcontext = subcontext;
    this.subitem_bases = subitem_bases;
    this.parentActivity=parentactivity;
}

static class Groupname {
    private TextView group_name;
    private TextView groupitem_price;
    private Button grouporder;
    private ImageView droparrow;
}

static class Childnames {
    private TextView item_name;
    private TextView item_price;
    private Button order;
}

@Override
public int getGroupCount() {
    return subitem_bases.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    ArrayList<Subitem_base_child> subitem_base_children = subitem_bases.get(groupPosition).getItems();
    return subitem_base_children.size();
}


@Override
public Object getGroup(int groupPosition) {
    return subitem_bases.get(groupPosition);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    ArrayList<Subitem_base_child> subitem_base_children = subitem_bases.get(groupPosition).getItems();
    return subitem_base_children.get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    Groupname groupname;
    if (convertView == null) {
        convertView = LayoutInflater.from(subcontext).inflate(R.layout.group_item, parent, false);
        groupname = new Groupname();
        groupname.group_name = (TextView) convertView.findViewById(R.id.group_name);
        groupname.groupitem_price = (TextView) convertView.findViewById(R.id.groupitem_price);
        groupname.grouporder = (Button) convertView.findViewById(R.id.grouporder);
        groupname.droparrow = (ImageView) convertView.findViewById(R.id.droparrow);
        convertView.setTag(groupname);
    } else {
        groupname = (Groupname) convertView.getTag();
    }
    Subitem_base groupitem = subitem_bases.get(groupPosition);
    groupname.group_name.setText(groupitem.getGroupitemname());
    if (isExpanded){
        String[] elements = {groupitem.getGroupitemname() };
        for (String s: elements) {
            itembasename=s;
        }
    }
    if (getChildrenCount(groupPosition)>=2) {
        Log.d("Std", "called");
    }else {
        groupname.groupitem_price.setVisibility(View.VISIBLE);
        groupname.droparrow.setVisibility(View.GONE);
        groupname.grouporder.setVisibility(View.VISIBLE);
    }
    return convertView;
}

@Override
public View getChildView(final int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    final Childnames childname;
    if (convertView == null) {
        convertView = LayoutInflater.from(subcontext).inflate(R.layout.child_item, parent, false);
        childname = new Childnames();
        childname.item_name = (TextView) convertView.findViewById(R.id.item_name);
        childname.item_price = (TextView) convertView.findViewById(R.id.item_price);
        childname.order = (Button) convertView.findViewById(R.id.order);
        convertView.setTag(childname);
    }else {
        childname= (Childnames) convertView.getTag();
    }
    Subitem_base_child childitem = (Subitem_base_child) getChild(groupPosition, childPosition);
    if (childitem.getChilditemname().isEmpty()){
        childname.item_name.setVisibility(View.GONE);
    }else {
        childname.item_name.setText(childitem.getChilditemname());
    }
    childname.item_price.setText(childitem.getChilditemprice());
    loginPreferences = subcontext.getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
    final String status = loginPreferences.getString("Status", "");
    if (status.equals("0")) {
        childname.order.setBackgroundResource(R.drawable.cart_disable);
    }else {
        childname.order.setBackgroundResource(R.drawable.cart_button);
    }

    childname.order.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (status.equals("0")) {
                final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(parentActivity);
                SharedPreferences customerid = subcontext.getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
                String opentimes = customerid.getString("open", "");
                alertDialogBuilder.setMessage(opentimes);
                alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                        alertDialogBuilder.setCancelable(true);
                    }
                });
                AlertDialog alertDialog = alertDialogBuilder.create();
                alertDialog.show();
            } else {
                String poundre = childname.item_price.getText().toString();
                subtmsub=childname.item_name.getText().toString();
                subitempri = poundre.replace("£", "");
                addcart();
            }
        }
    });
    return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}
private void addcart(){
    loginPreferences = subcontext.getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
    loginPrefsEditor = loginPreferences.edit();
    SharedPreferences customerid = subcontext.getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
    loginPreferences.edit();
    String customid = customerid.getString("customerid", "");
    String cartdetails = itembasename + " " + subtmsub;
    String cartspacong = cartdetails.replace(" ", "$");
    cartspacong = cartspacong.replace("&", "and");
    String addcarturl = Constant.commonurltake + "cart_process.php?userid=" + customid + "&Item=" + cartspacong + "&Itemcount=1&price=" + subitempri + "&page=items";
    Log.d("Cart", addcarturl);
    JsonArrayRequest cartreq = new JsonArrayRequest(Request.Method.POST, addcarturl, (String) null, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            for (int i = 0; i < response.length(); i++) {
                try {
                    JSONObject cartobj = response.getJSONObject(i);
                    String cartnumber = cartobj.getString("count");
                    loginPrefsEditor.putString("Count", cartnumber);
                    BaseActivity.cartnumber.setVisibility(View.VISIBLE);
                    BaseActivity.cartnumber.setText(cartnumber);
                    loginPrefsEditor.apply();
                    if (cartobj.has("message")) {
                        Toast carttost = Toast.makeText(subcontext, cartobj.getString("message"), Toast.LENGTH_SHORT);
                        carttost.setGravity(Gravity.CENTER, 0, 0);
                        carttost.show();
                    } else {
                        Toast carttost = Toast.makeText(subcontext, "Product Added To Cart", Toast.LENGTH_SHORT);
                        carttost.setGravity(Gravity.CENTER, 0, 0);
                        carttost.show();
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(subcontext, "" + error, Toast.LENGTH_SHORT).show();
        }
    });
    cartreq.setRetryPolicy(new DefaultRetryPolicy(10000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
            DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    AppController.getInstance().addToRequestQueue(cartreq);
}

}