0
我有一個列表視圖，它顯示了來自web服務的值。它加載列表視圖時很好。但是當我點擊任何項目來打開一個新的片段（顯示該項目的細節）並返回到相同的列表視圖時，其項目每次都會翻倍。例如，如果我（總共）有5個項目。然後當我從片段中回來時，總數將是10，然後是15，依此類推。這意味着應用程序一次又一次地添加所有項目。我搜索瞭解決方案，並做了什麼是像adapter.notifyDataSetChanged()一般的解決方案，但它仍然得到重複。如果任何人都可以告訴我這個問題，我將不勝感激。整個列表視圖被複制
public class CustomListAdapter extends ArrayAdapter<Model> {
private Context mContext;
int resource;
private ArrayList<Model> mListData = new ArrayList<Model>();
public CustomListAdapter(Context mContext, int resource, ArrayList<Model> mListData) {
super(mContext, resource, mListData);
this.resource = resource;
this.mContext = mContext;
this.mListData = mListData;
}
public void setListData(ArrayList<Model> mListData) {
this.mListData = mListData;
notifyDataSetChanged();
}
@Override
public int getCount() {
return super.getCount();
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
View v = convertView;
final ViewHolder holder;
if (v == null) {
holder = new ViewHolder();
LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
v = inflater.inflate(resource, parent, false);
holder.custname = (TextView) v.findViewById(R.id.cust_name);
holder.date = (TextView) v.findViewById(R.id.date);
holder.staffname = (TextView) v.findViewById(R.id.staff_name);
holder.time = (TextView) v.findViewById(R.id.time);
holder.service = (TextView) v.findViewById(R.id.service);
holder.refid = (TextView) v.findViewById(R.id.refid);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
final Model item = mListData.get(position);
holder.custname.setText(item.getCustname());
holder.date.setText(item.getDate());
holder.staffname.setText(item.getStaffname());
holder.time.setText(item.getTime());
holder.service.setText(item.getService());
holder.refid.setText(item.getRefid());
return v;
}
class ViewHolder {
TextView custname, date, staffname, time, service, refid;
}
}public class ListFrag extends Fragment{
private SwipeMenuListView listView;
private CustomListAdapter adapter;
private CShowProgress cShowProgress;
private SQLiteHandler db;
private String uid, bookingId;
private ArrayList<Model> arrayList = new ArrayList<>();
private static final String BOOKED_LIST = "http://192.168.220.13/android/showbookinglist";
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.listfrag, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
listView = (SwipeMenuListView)view.findViewById(R.id.list);
db = new SQLiteHandler(getActivity());
cShowProgress = CShowProgress.getInstance();
fetchDetails();
adapter = new CustomListAdapter(getActivity(), R.layout.listitem, arrayList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String a = arrayList.get(i).getCustname();
String b = arrayList.get(i).getStaffname();
String c = arrayList.get(i).getService();
String d = arrayList.get(i).getDate();
String e = arrayList.get(i).getTime();
String f = arrayList.get(i).getRefid();
String g = arrayList.get(i).getEmail();
String h = arrayList.get(i).getServprice();
String j = arrayList.get(i).getSpeclprice();
String k = arrayList.get(i).getStatus();
db.addDetails(a, b, c, d, e, f, g, h, j, k);
DetailsView details = new DetailsView();
((Bookings)getActivity()).replaceFragment(details);
}
});
}
private void fetchDetails() {
cShowProgress.showProgress(getActivity());
StringRequest stringRequest = new StringRequest(Request.Method.POST, BOOKED_LIST,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
cShowProgress.hideProgress();
try {
JSONArray jsonArray = new JSONArray(response);
for(int i=0; i<jsonArray.length(); i++){
JSONObject obj = jsonArray.getJSONObject(i);
Model model = new Model();
model.setCustname(obj.getString("customername"));
model.setDate(obj.getString("staffdate"));
model.setStaffname(obj.getString("staffname")+"(Staff)");
model.setTime(obj.getString("stafftime"));
model.setService(obj.getString("servicename"));
model.setRefid(obj.getString("booking_referenceid"));
model.setEmail(obj.getString("customeremail"));
model.setServprice(obj.getString("serviceprice"));
model.setSpeclprice(obj.getString("specialprice"));
model.setStatus(obj.getString("status"));
model.setBookid(obj.getString("bookingid"));
arrayList.add(model);
}
adapter.notifyDataSetChanged();
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(getActivity(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(), "VolleyError" + error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("spaid", "145");
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(stringRequest);
}
}
清除數組列表是最好的解決方案。非常感謝@saurabh 此外，感謝你們所有人的回覆。 –
正確..快樂編碼:) –
我做了一切，以找出我有這個問題，你先生，令人驚歎 – rookieDeveloper