I am working on the expandable list view with multiple group layouts but having single child as common for all the layouts but in the getChildView() method I am getting the cast error not able understand whats the reason behind please help me out friends
this error I am getting
java.lang.ClassCastException: com.app.prominere.standardtakeout.SubItem_ExpandAdapter$Groupname cannot be cast to com.app.prominere.standardtakeout.SubItem_ExpandAdapter$Childnames
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 static final int single = 1;
public static final int two = 2;
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;
}
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 int getGroupTypeCount() {
return 2;
}
@Override
public int getGroupType(int groupPosition) {
Subitem_base groupstype = subitem_bases.get(groupPosition);
if (groupstype.getGrpcount().equals("1")) {
return single;
} else {
return two;
}
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
Groupname groupname;
Subitem_base groupitem = subitem_bases.get(groupPosition);
int grouptype = getGroupType(groupPosition);
if (convertView == null) {
if (grouptype == single) {
convertView = LayoutInflater.from(subcontext).inflate(R.layout.groupcount_single, parent, false);
} else {
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);
convertView.setTag(groupname);
} else {
groupname = (Groupname) convertView.getTag();
}
groupname.group_name.setText(groupitem.getGroupitemname());
groupname.groupitem_price.setText(groupitem.getGrprice());
if (isExpanded) {
String[] elements = {groupitem.getGroupitemname()};
for (String s : elements) {
itembasename = s;
}
}
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);
}
}
According to official documentation
It is not guaranteed that the convertView will have been previously created by getChildView(int, int, boolean, View, ViewGroup)
I think in this case you need to check
if (convertView != null && convertView.getTag() instance of Childnames) {
// reuse the convertView
else
// create new view
}