從url中刪除項目但不更新recyclerview

Question

使用gson，凌空和使用recyclerview顯示它後獲取和發佈項目後，我從recyclerviewadapter中刪除項目。項目在網址上被刪除，但不會更新recyclerview。刪除的項目仍然存在。首先，我必須再次回到重新啓動應用程序時更新UI。我希望它在同一時間更新。

public class RecyclerViewAdapter extends android.support.v7.widget.RecyclerView.Adapter<RecyclerViewHolders> { 
private List<FriendsData> friendList; 
private Context context; 

//making class recyclerviewadapter for fetching friendlist 
public RecyclerViewAdapter(Context context, List<FriendsData> friendList) { 
    this.friendList = friendList; 
    this.context = context; 
} 
@Override 
//view holder is holding the data 
public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) { 
    View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_friend, null); 
    RecyclerViewHolders recyclerViewHolders = new RecyclerViewHolders(layoutView); 
    return recyclerViewHolders; 
} 
//method for deleting friend 
public void delete(int position) { //removes the row 
    friendList.remove(position); 

    notifyItemRemoved(position); 
    notifyItemRangeChanged(position,friendList.size()); 
    //notifyDataSetChanged(); 
    } 
    @Override 
//onBindViewHolder is binding the data to recyclerviewholder 
public void onBindViewHolder(RecyclerViewHolders holder, final int position) { 
    //current = friendList.get(position); 
    //setting id,firstname,lastname,contact to holder 
    holder.id.setText(String.valueOf("Id: " + friendList.get(position).getId())); 
    holder.firstName.setText("First Name: " + friendList.get(position).getFirstname()); 
    holder.lastName.setText("Last Name: " + friendList.get(position).getLastname()); 
    holder.contact.setText("Contact: " + friendList.get(position).getContact()); 
    //delete button is clicked 
    holder.del.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      //making requestqueue 
      RequestQueue queue = Volley.newRequestQueue(context); 
      String url="http://192.168.1.50:8080/*********/"+friendList.get(position).getId(); 
      //making json object request 
      JsonObjectRequest jsonObjReq= new JsonObjectRequest(Request.Method.DELETE,url,null, new Response.Listener<JSONObject>() { 
       @Override 
       //getting response 
       public void onResponse(JSONObject response){ 
        Log.d("Tag", response.toString()); 
        //deleting that particular friend data 
        delete(position); 
        //adapter(position); 
        //notifyDataSetChanged(); 
       } 
      } 

     ,new Response.ErrorListener() { 
        @Override 
        //getting error response 
        public void onErrorResponse(VolleyError error) { 
         //getting error message 
         VolleyLog.d("TAG", "Error:" + error.getMessage()); 
        } 

     }); 
      //adding request to queue 
      queue.add(jsonObjReq); 
     } 
    }); 
}; 

    @Override 
    //counting total friends for displaying 
    public int getItemCount() { 
     //returning size of list 
     return friendList.size(); 
    } 

} 

Answer 1

刪除一個項目後調用您的列表url函數。它會自動重新綁定RecyclerView的適配器。