在我的Android应用程序中，我使用回收器视图来显示项目。
（注意：这不是一个重复的问题，因为我尝试了stackoverflow的许多答案，但没有解决方案。）
我的问题
回收者视图显示重复的项目。单个项目重复多次，即使它只在源数据库中出现一次。
我检查了原因并注意到Adapter类中的List对象在所有迭代中返回相同的值。但是将List对象发送到具有唯一值的适配器类的Fragment。
但只有接收List对象后的适配器类包含重复项
我尝试的解决方案
我检查了Stackoverflow并在适配器类中添加了getItemId（int position）和getItemViewType（int position）但没有解决方案
我检查了数据库和列表视图发送类都没有重复的项目。
我的代码：
InboxHostFragment.java =此类将List对象发送到recycler视图的适配器类：
public class HostInboxFragment extends Fragment {
View hostinbox;
Toolbar toolbar;
ImageView archive, alert, search;
TextView blank;
Bundle args = new Bundle();
private static final String TAG = "Listinbox_host";
private InboxHostAdapter adapter;
String Liveurl = "";
RelativeLayout layout, host_inbox;
String country_symbol;
String userid;
String login_status, login_status1;
ImageButton back;
String roomid;
RecyclerView listView;
String name = "ramesh";
private int start = 1;
private List < ListFeed > movieList = new ArrayList < > ();
String currency1;
// RecyclerView recyclerView;
public HostInboxFragment() {
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@RequiresApi(api = Build.VERSION_CODES.M)
public View onCreateView(final LayoutInflater inflater, final ViewGroup container,
Bundle savedInstanceState) {
hostinbox = inflater.inflate(R.layout.fragment_host_inbox, container, false);
FontChangeCrawler fontChanger = new FontChangeCrawler(getContext().getAssets(), getString(R.string.app_font));
fontChanger.replaceFonts((ViewGroup) hostinbox);
SharedPreferences prefs = getActivity().getSharedPreferences(Constants.MY_PREFS_NAME, MODE_PRIVATE);
userid = prefs.getString("userid", null);
currency1 = prefs.getString("currenycode", null);
toolbar = (Toolbar) hostinbox.findViewById(R.id.toolbar);
archive = (ImageView) hostinbox.findViewById(R.id.archive);
alert = (ImageView) hostinbox.findViewById(R.id.alert);
search = (ImageView) hostinbox.findViewById(R.id.search);
blank = (TextView) hostinbox.findViewById(R.id.blank);
host_inbox = (RelativeLayout) hostinbox.findViewById(R.id.host_inbox);
layout.setVisibility(View.INVISIBLE);
start = 1;
final String url = Constants.DETAIL_PAGE_URL + "payment/host_reservation_inbox?userto=" + userid + "&start=" + start + "&common_currency=" + currency1;
//*******************************************ListView code start*****************************************************
System.out.println("url in Inbox page===" + url);
movieList.clear();
JsonObjectRequest movieReq = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener < JSONObject > () {
@SuppressWarnings("deprecation")
@Override
public void onResponse(JSONObject response) {
// progressBar.setVisibility(View.GONE);
// Parsing json
// for (int i = 0; i < response.length(); i++) {
try {
JSONArray contact = response.getJSONArray("contact");
obj_contact = contact.optJSONObject(0);
login_status1 = obj_contact.getString("Status");
// progressBar.setVisibility(View.VISIBLE);
layout.setVisibility(View.INVISIBLE);
listView.setVisibility(View.VISIBLE);
host_inbox.setBackgroundColor(Color.parseColor("#FFFFFF"));
ListFeed movie = new ListFeed();
for (int i = 0; i < contact.length(); i++) {
JSONObject obj1 = contact.optJSONObject(i);
movie.getuserby(obj1.getString("userby"));
movie.resid(obj1.getString("reservation_id"));
movie.setresidinbox(obj1.getString("reservation_id"));
System.out.println("reservation iddgdsds" + obj1.getString("reservation_id"));
movie.setuserbys(obj1.getString("userby"));
movie.setuserto(obj1.getString("userto"));
movie.setid(obj1.getString("room_id"));
movie.getid1(obj1.getString("id"));
movie.userto(obj1.getString("userto"));
movie.isread(obj1.getString("isread"));
movie.userbyname(obj1.getString("userbyname"));
country_symbol = obj1.getString("currency_code");
Currency c = Currency.getInstance(country_symbol);
country_symbol = c.getSymbol();
movie.setsymbol(country_symbol);
movie.setTitle(obj1.getString("title"));
movie.setThumbnailUrl(obj1.getString("profile_pic"));
movie.setstatus(obj1.getString("status"));
movie.setcheckin(obj1.getString("checkin"));
movie.setcheckout(obj1.getString("checkout"));
movie.setcreated(obj1.getString("created"));
movie.guest(obj1.getString("guest"));
movie.userbyname(obj1.getString("username"));
movie.getprice(obj1.getString("price"));
String msg = obj1.getString("message");
msg = msg.replaceAll("<b>You have a new contact request from ", "");
msg = msg.replaceAll("</b><br><br", "");
msg = msg.replaceAll("\\w*\\>", "");
movie.message(msg);
movieList.add(movie);
System.out.println(movieList.get(i).message()); // returning unique values
adapter.notifyDataSetChanged();
}
}
} catch (JSONException e) {
e.printStackTrace();
// progressBar.setVisibility(View.GONE);
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
stopAnim();
//progressBar.setVisibility(View.GONE);
if (error instanceof NoConnectionError) {
Toast.makeText(getActivity(),
"Check your Internet Connection",
Toast.LENGTH_LONG).show();
}
//progressBar.setVisibility(View.GONE);
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
movieReq.setRetryPolicy(new DefaultRetryPolicy(5000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
return hostinbox;
}
@Override
public void onStop() {
Log.w(TAG, "App stopped");
super.onStop();
}
@Override
public void onDestroy() {
super.onDestroy();
}
public boolean isOnline(Context c) {
ConnectivityManager cm = (ConnectivityManager) c
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
return ni != null && ni.isConnected();
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
在上面的代码中，
System.out.println(movieList.get(i).message());毫无问题地返回唯一值。
Inboxhostadapter.java =这是recycleview的适配器
public class InboxHostAdapter extends RecyclerView.Adapter < InboxHostAdapter.CustomViewHolder > {
private List < ListFeed > feedItemList;
private ListFeed listFeed = new ListFeed();
String userid = "",
tag,
str_currency;
String reservation_id,
Liveurl,
india2 = "0";
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
String currency1;
String status1;
//private Activity activity;
public Context activity;
public InboxHostAdapter(Context activity, List < ListFeed > feedItemList, String tag) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(activity);
Liveurl = sharedPreferences.getString("liveurl", null);
userid = sharedPreferences.getString("userid", null);
currency1 = sharedPreferences.getString("currenycode", null);
this.feedItemList = feedItemList; // returning duplicate items
this.activity = activity;
listFeed = new ListFeed();
this.tag = tag;
SharedPreferences prefs1 = activity.getSharedPreferences(Constants.MY_PREFS_LANGUAGE, MODE_PRIVATE);
str_currency = prefs1.getString("currencysymbol", null);
if (str_currency == null) {
str_currency = "$";
}
}
@Override
public InboxHostAdapter.CustomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.hostinbox, parent, false);
FontChangeCrawler fontChanger = new FontChangeCrawler(activity.getAssets(), activity.getString(R.string.app_font_light));
fontChanger.replaceFonts((ViewGroup) view);
return new CustomViewHolder(view);
}
@Override
public void onBindViewHolder(InboxHostAdapter.CustomViewHolder holder, int position) {
// This block returning duplicate items
listFeed = feedItemList.get(position); // This list feedItemList returning duplicate items
reservation_id = listFeed.getid();
System.out.println("reservation id after getting in inbox adapter" + reservation_id);
System.out.println("check out after getting" + listFeed.getcheckout());
System.out.println("message after getting in inbox adapter" + listFeed.getTitle());
System.out.println("symbol after getting" + listFeed.getsymbol());
System.out.println("username after getting" + listFeed.getaddress());
System.out.println("price after getting" + listFeed.getprice());
System.out.println("status after getting" + listFeed.getstatus());
System.out.println("check in after getting" + listFeed.getcheckin());
System.out.println("check out after getting" + listFeed.getcheckout());
System.out.println("userby after getting====" + listFeed.getuserby());
System.out.println("message after getting====" + listFeed.message());
String msg;
msg = listFeed.message();
holder.name.setText(listFeed.userbyname());
holder.time.setText(listFeed.getcreated());
holder.date1.setText(listFeed.getcheckin());
holder.date2.setText(listFeed.getcheckout());
if (listFeed.guest().equals("1")) {
holder.guest.setText(listFeed.guest() + activity.getResources().getString(R.string.guests));
} else {
holder.guest.setText(listFeed.guest() + activity.getResources().getString(R.string.guests));
}
if (tag.equals("Listinbox_service_host")) {
holder.guest.setText("");
holder.ttt.setVisibility(View.INVISIBLE);
} else {
holder.guest.setText(listFeed.guest() + activity.getResources().getString(R.string.guests));
}
// holder.status.setText(listFeed.getstatus());
holder.title.setText(listFeed.getTitle());
status1 = listFeed.getstatus();
if (status1.equals("Accepted")) {
holder.status.setText(activity.getResources().getString(R.string.accepted_details));
}
} else if (status1.equals("Contact Host")) {
holder.status.setText(activity.getResources().getString(R.string.Contact_Host));
holder.guestmsg.setText(listFeed.message());
} else {
holder.status.setText(status1);
}
if (currency1 == null) {
currency1 = "$";
}
if (listFeed.getprice() != null && !listFeed.getprice().equals("null")) {
DecimalFormat money = new DecimalFormat("00.00");
money.setRoundingMode(RoundingMode.UP);
india2 = money.format(new Double(listFeed.getprice()));
holder.currency.setText(listFeed.getsymbol() + " " + india2);
holder.currency.addTextChangedListener(new NumberTextWatcher(holder.currency));
}
//view.imgViewFlag.setImageResource(listFlag.get(position));
System.out.println("listview price" + listFeed.getprice());
System.out.println("listview useds" + listFeed.getresidinbox());
System.out.println("listview dffdd" + listFeed.getuserbys());
System.out.println("listview dfffdgjf" + listFeed.getuserto());
//holder.bucket.setTag(position);
System.out.println("Activity name" + tag);
holder.inbox.setTag(position);
holder.inbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = (int) v.getTag();
Intent search = new Intent(activity, Inbox_detailshost.class);
search.putExtra("userid", userid);
search.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
activity.startActivity(search);
System.out.println("listview useds" + listFeed.getresidinbox());
System.out.println("listview dffdd" + listFeed.getuserbys());
System.out.println("listview dfffdgjf" + listFeed.getuserto());
}
});
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public int getItemCount() {
System.out.println("list item size" + feedItemList.size());
return (null != feedItemList ? feedItemList.size() : 0);
}
@Override
public int getItemViewType(int position) {
return position;
}
class CustomViewHolder extends RecyclerView.ViewHolder {
ImageView thumbNail;
TextView name, time, date1, date2, currency, guest, status, title, ttt, guestmsg;
RelativeLayout inbox;
CustomViewHolder(View view) {
super(view);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
this.thumbNail = (ImageView) view.findViewById(R.id.list_image);
this.name = (TextView) view.findViewById(R.id.title2);
this.time = (TextView) view.findViewById(R.id.TextView4);
this.date1 = (TextView) view.findViewById(R.id.TextView2);
this.date2 = (TextView) view.findViewById(R.id.TextView22);
this.currency = (TextView) view.findViewById(R.id.TextView23);
this.guest = (TextView) view.findViewById(R.id.TextView25);
this.ttt = (TextView) view.findViewById(R.id.TextView24);
this.status = (TextView) view.findViewById(R.id.TextView26);
this.title = (TextView) view.findViewById(R.id.TextView28);
this.inbox = (RelativeLayout) view.findViewById(R.id.inbox);
this.guestmsg = (TextView) view.findViewById(R.id.guestmessage);
}
}
public class NumberTextWatcher implements TextWatcher {
private DecimalFormat df;
private DecimalFormat dfnd;
private boolean hasFractionalPart;
private TextView et;
public NumberTextWatcher(TextView et) {
df = new DecimalFormat("#,###");
df.setDecimalSeparatorAlwaysShown(true);
dfnd = new DecimalFormat("#,###.##");
this.et = et;
hasFractionalPart = false;
}
@SuppressWarnings("unused")
private static final String TAG = "NumberTextWatcher";
@Override
public void afterTextChanged(Editable s) {
et.removeTextChangedListener(this);
try {
int inilen, endlen;
inilen = et.getText().length();
String v = s.toString().replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()), "");
Number n = df.parse(v);
int cp = et.getSelectionStart();
if (hasFractionalPart) {
et.setText(df.format(n));
} else {
et.setText(dfnd.format(n));
}
endlen = et.getText().length();
int sel = (cp + (endlen - inilen));
if (sel > 0 && sel <= et.getText().length()) {
et.setSelected(true);
}
} catch (NumberFormatException nfe) {
// do nothing?
} catch (ParseException e) {
// do nothing?
}
et.addTextChangedListener(this);
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.toString().contains(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator()))) {
hasFractionalPart = true;
} else {
hasFractionalPart = false;
}
}
}
}
在上面的代码中， feedItemList 返回重复值eventhogh来自源clas的movieList列表Inboxfragment.java包含唯一值。
请帮我解决这个问题。我在Stackoverflow中尝试了很多答案，但我无法得到解决方案。我无法弄清楚问题。
答案 0 :(得分：1)
使用此代码
for (int i = 0; i < contact.length(); i++) {
JSONObject obj1 = contact.optJSONObject(i);
ListFeed movie = new ListFeed();
movie.getuserby(obj1.getString("userby"));
movie.resid(obj1.getString("reservation_id"));
movie.setresidinbox(obj1.getString("reservation_id"));
System.out.println("reservation iddgdsds" + obj1.getString("reservation_id"));
movie.setuserbys(obj1.getString("userby"));
movie.setuserto(obj1.getString("userto"));
movie.setid(obj1.getString("room_id"));
movie.getid1(obj1.getString("id"));
movie.userto(obj1.getString("userto"));
movie.isread(obj1.getString("isread"));
movie.userbyname(obj1.getString("userbyname"));
country_symbol = obj1.getString("currency_code");
Currency c = Currency.getInstance(country_symbol);
country_symbol = c.getSymbol();
movie.setsymbol(country_symbol);
movie.setTitle(obj1.getString("title"));
movie.setThumbnailUrl(obj1.getString("profile_pic"));
movie.setstatus(obj1.getString("status"));
movie.setcheckin(obj1.getString("checkin"));
movie.setcheckout(obj1.getString("checkout"));
movie.setcreated(obj1.getString("created"));
movie.guest(obj1.getString("guest"));
movie.userbyname(obj1.getString("username"));
movie.getprice(obj1.getString("price"));
String msg = obj1.getString("message");
msg = msg.replaceAll("<b>You have a new contact request from ", "");
msg = msg.replaceAll("</b><br><br", "");
msg = msg.replaceAll("\\w*\\>", "");
movie.message(msg);
movieList.add(movie);
System.out.println(movieList.get(i).message()); // returning unique value
}
将ListFeed movie = new ListFeed();声明为for Loop
并从adapter.notifyDataSetChanged();中删除for Loop。
我认为这有助于你。