Question

使用gson，volley获取和发布项目并使用recyclerview显示它后，我将从recyclerviewadapter中删除项目。项目在网址上被删除，但它没有更新recyclerview。删除的项目仍然存在。首先，我必须再次返回重新启动应用程序，它正在更新UI。我希望它能够同时更新。

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

删除一个项目后调用您的列表网址功能。它会自动重新绑定RecyclerView的适配器。

从url删除项目但不更新recyclerview

1 个答案: