我已经实现了一个具有recyclerview的片段。在片段' OnCreateView 中初始化recyclerview及其适配器后，我将如下所示更新recyclerview：
添加项目：首先，我调用自定义 AlertView ，通过使用AsyncTask发送请求以在服务器中保存 Store 对象。我在 OnPostExecute
中更新了适配器数据删除项目：每个视图都有一个buttun删除其相关对象。 OnclickListener在调用asynctask的适配器中实现，以从服务器中删除Store对象。
我的问题：一切正常但是在添加和删除后，recyclerview不会刷新，除非退出片段并重新打开它。 提前谢谢。
我的片段：
RemoteRegistry我的适配器：
public class Main_ShopkeeperFragment extends Fragment{
RecyclerView recListStores;
StoresOfShopkeeperAdapter ta;
LinearLayoutManager llm;
List<Store> data = new ArrayList<>();
private TextView tv_name,tv_nationalid,tv_address, tv_phone,tv_description;
Button btn_exit,btn_edit,btn_expand_desc,btn_expand_store,
btn_add_store,btn_delete;
private Prefs prefs;
private MaterialSpinner sp_type,sp_state,sp_city;
int typeid,stateid,cityid;
String typeName,stateName,cityName, name,phone, address,description;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main__shopkeeper, container, false);
tv_name = (TextView) rootView.findViewById(R.id.shopkeeper_name_spectext);
tv_nationalid = (TextView) rootView.findViewById(R.id.shopkeeper_nationalid_spectext);
tv_address = (TextView) rootView.findViewById(R.id.shopkeeper_address_spectext);
tv_phone = (TextView) rootView.findViewById(R.id.shopkeeper_phone_spectext);
tv_description = (TextView) rootView.findViewById(R.id.shopkeeper_description_spectext);
btn_exit = (Button) rootView.findViewById(R.id.exit_spec);
btn_expand_desc = (Button) rootView.findViewById(R.id.expand);
btn_expand_store = (Button) rootView.findViewById(R.id.expand_store);
btn_add_store = (Button) rootView.findViewById(R.id.add_store);
recListStores = (RecyclerView) rootView.findViewById(R.id.shopkeeper_stores) ;
//recListStores.setHasFixedSize(true);
llm = new LinearLayoutManager(getContext());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recListStores.setLayoutManager(llm);
recListStores.setItemAnimator(new DefaultItemAnimator());
ta = new StoresOfShopkeeperAdapter(getContext(), data);
//ta.setHasStableIds(true);
recListStores.setAdapter(ta);
Check_Connection_Retrive();
InitializeTextViews();
btn_add_store.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AddStore_AlertView();
}
});
return rootView;
}
private void AddStore_AlertView() {
final AlertDialog.Builder dialog = new AlertDialog.Builder(getActivity());
LayoutInflater inf = getActivity().getLayoutInflater();
final View inflator = inf.inflate(R.layout.add_store_layout, null);
final EditText et_name = (EditText) inflator.findViewById(R.id.store_name);
final EditText et_phone = (EditText) inflator.findViewById(R.id.store_phone);
final EditText et_address = (EditText) inflator.findViewById(R.id.store_address);
final EditText et_description = (EditText) inflator.findViewById(R.id.store_description);
sp_type = (MaterialSpinner) inflator.findViewById(R.id.store_type_Spinner);
sp_state = (MaterialSpinner) inflator.findViewById(R.id.store_state_Spinner);
sp_city = (MaterialSpinner) inflator.findViewById(R.id.store_city_Spinner);
new FetchStates().execute();
new FetchTypes().execute();
dialog.setView(inflator)
.setNegativeButton("انصراف", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialoginterface, int i) {
dialoginterface.cancel();
}})
.setPositiveButton("ثبت", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialoginterface, int i) {
}
});
final AlertDialog dial = dialog.create();
dial.show();
dial.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Boolean wantToCloseDialog = false;
name = et_name.getText().toString();
phone = et_phone.getText().toString();
address = et_address.getText().toString();
description = et_description.getText().toString();
//Do stuff, possibly set wantToCloseDialog to true then...
if(wantToCloseDialog)
dial.dismiss();
View focusView = null;
Boolean cancel = false;
if (TextUtils.isEmpty(name)) {
et_name.setFocusable(true);
et_name.setError("نام و نام خانوادگی را وارد کنید");
et_name.requestFocus();
cancel = true;
}
if (TextUtils.isEmpty(address)) {
et_address.setError("آدرس را وارد کنید");
focusView = et_address;
cancel = true;
}
if (TextUtils.isEmpty(phone)) {
et_phone.setError("شماره تماس را وارد کنید");
focusView = et_phone;
cancel = true;
}
if (TextUtils.isEmpty(description)) {
et_description.setError("توضیحات را وارد کنید");
focusView = et_description;
cancel = true;
}
if (TextUtils.isEmpty(sp_state.getText().toString())) {
sp_state.setError("استان را انتخاب کنید");
focusView = sp_state;
cancel = true;
}
if (TextUtils.isEmpty(sp_city.getText().toString())) {
sp_city.setError("شهر را انتخاب کنید");
focusView = sp_city;
cancel = true;
}
if (TextUtils.isEmpty(sp_type.getText().toString())) {
sp_type.setError("نوع فروشگاه را انتخاب کنید");
focusView = sp_type;
cancel = true;
}
if(cancel)
focusView.requestFocus();
else {
new RegStoreRequest().execute();
dial.dismiss();
}
}
});
public void Check_Connection_Retrive()
{
new FetchStores().execute();
}
public class FetchStores extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(getContext());
HttpURLConnection conn;
URL url = null;
@Override
protected void onPreExecute() {
super.onPreExecute();
pdLoading.setMessage("در حال بارگیری");
pdLoading.setCancelable(false);
//pdLoading.setProgress(10);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
url = new URL("http://www/api/"+prefs.getShopkeeper().nationalid+"/storeshopkeeper");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "1";
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(1000);
conn.setConnectTimeout(1000);
conn.setRequestMethod("GET");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return "2";
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return "3";
}
} catch (IOException e) {
e.printStackTrace();
return "4";
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
pdLoading.dismiss();
//this method will be running on UI thread
switch(result) {
case "1":
//alertView1("خطا در انجام عملیات (1)",false);
Toast.makeText(getContext(), "خطا در انجام عملیات (1)", Toast.LENGTH_SHORT).show();
break;
case "2":
//alertView1("خطا در انجام عملیات (2)",false);
Toast.makeText(getContext(), "خطا در انجام عملیات (2)", Toast.LENGTH_SHORT).show();
break;
case "3":
//alertView1( "خطا در انجام عملیات (3)",false);
Toast.makeText(getContext(), "خطا در انجام عملیات (3)", Toast.LENGTH_SHORT).show();
break;
case "4":
//alertView1("شبکه اینترنت ضعیف است، لطفا دوباره تلاش کنید.",false);
Toast.makeText(getContext(), "شبکه اینترنت ضعیف است، لطفا دوباره تلاش کنید.", Toast.LENGTH_SHORT).show();
break;
default:
try {
recListStores.removeAllViews();
data.clear();
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
Store store = new Store();
store.id = json_data.getInt("id");
store.name = json_data.getString("name");
store.address = json_data.getString("address");
store.phone = json_data.getString("phone");
store.description = json_data.getString("description");
store.Shopkeeper_id = json_data.getInt("shopkeeper_id");
store.type_id = json_data.getInt("type_id");
store.state_id = json_data.getInt("state_id");
store.city_id = json_data.getInt("city_id");
store.image1 = json_data.getString("image1");
store.like = json_data.getInt("like");
data.add(store);
}
ta.notifyDataSetChanged();
} catch (JSONException e) {
Toast.makeText(getContext(), e.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
public class RegStoreRequest extends AsyncTask<String, String, String> {
HttpURLConnection conn;
URL url = null;
String data1 = "";
ProgressDialog pdLoading;
@Override
protected void onPreExecute() {
super.onPreExecute();
pdLoading = new ProgressDialog(getContext());
pdLoading.setCancelable(false);
pdLoading.show();
pdLoading.setTitle("در حال ارسال اطلاعات");
}
@Override
protected String doInBackground(String... params) {
try {
url = new URL("http://test.tiarafood.ir/api/registerstore");
data1 = URLEncoder.encode("nationalid", "UTF-8") + "=" + URLEncoder.encode(prefs.getShopkeeper().nationalid, "UTF-8");
data1 = data1 + "&" + URLEncoder.encode("name", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8");
data1 = data1+ "&" + URLEncoder.encode("address", "UTF-8") + "=" + URLEncoder.encode(address, "UTF-8");
data1 = data1+ "&" + URLEncoder.encode("phone", "UTF-8") + "=" + URLEncoder.encode(phone, "UTF-8");
data1 = data1+ "&" + URLEncoder.encode("description", "UTF-8") + "=" + URLEncoder.encode(description, "UTF-8");
data1 = data1+ "&" + URLEncoder.encode("type_id", "UTF-8") + "=" + URLEncoder.encode(String.valueOf(typeid), "UTF-8");
data1 = data1+ "&" + URLEncoder.encode("state_id", "UTF-8") + "=" + URLEncoder.encode(String.valueOf(stateid), "UTF-8");
data1 = data1+ "&" + URLEncoder.encode("city_id", "UTF-8") + "=" + URLEncoder.encode(String.valueOf(cityid), "UTF-8");
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(1000);
conn.setConnectTimeout(1000);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return "ERROR";
}
try {
OutputStreamWriter ow = new OutputStreamWriter(conn.getOutputStream());
ow.write(data1);
ow.flush();
if(conn.getResponseCode()== HttpURLConnection.HTTP_OK){
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input,"UTF-8"));
StringBuilder result = new StringBuilder();
String line= null;
while ((line = reader.readLine()) != null) {
if(line=="false")
return "ERROR";
result.append(line);
}
// Pass data to onPostExecute method
reader.close();
return (result.toString());
//return String.valueOf(conn.getResponseCode());
}
else
return "ERROR";
} catch (Exception e) {
e.printStackTrace();
return "ERROR";
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
pdLoading.dismiss();
if (result == "ERROR") {
Toast.makeText(getContext(), "خطا در ارسال اطلاعات",Toast.LENGTH_SHORT).show();
} else if (result.equalsIgnoreCase("repeate")) {
Toast.makeText(getContext(),"نام فروشگاه تکراری است.",Toast.LENGTH_SHORT).show();
} else {
try {
JSONArray jArray = new JSONArray(result);
JSONObject json_data = jArray.getJSONObject(0);
Store store = new Store();
store.id = json_data.getInt("id");
store.name = json_data.getString("name");
store.address = json_data.getString("address");
store.phone = json_data.getString("phone");
store.description = json_data.getString("description");
store.Shopkeeper_id = json_data.getInt("shopkeeper_id");
store.type_id = json_data.getInt("type_id");
store.state_id = json_data.getInt("state_id");
store.city_id = json_data.getInt("city_id");
store.image1 = json_data.getString("image1");
store.like = json_data.getInt("like");
data.add(store);
ta.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}