Recyclerview mit Searchview-Filter funktioniert nicht

Question

Ich verwende dieses Tutorial, um eine lokale Suche nach RecyclerView hinzuzufügen, in der Daten vom Webservice kommen. Problem ist, wenn ich etwas suche, nur die ersten beiden Einträge anzeigen. Und das passiert jedes Mal, wenn ich nach etwas suche. was auch immer ich eintrage nur die ersten beiden Items werden angezeigt. Aber wenn ich SearchView lösche, zeigt die Gesamtliste wieder an, welche korrekt ist. Aber warum filtert die eigentliche Suche nicht das richtige Element?

public class ProductsByCategoryActivity extends AppCompatActivity implements SearchView.OnQueryTextListener { 

    private RecyclerView recycler; 
    private ProductsByCatAdapter adapter; 
    private ArrayList<Model> arrayList = new ArrayList<Model>(); 
    private StaggeredGridLayoutManager gridmanager; 

    @Override 
    protected void onCreate(@Nullable Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_productbycategory); 

     searchview = (SearchView) findViewById(R.id.searchview); 

     cd = new ConnectionDetector(ProductsByCategoryActivity.this); 
     recycler = (RecyclerView) findViewById(R.id.recycler); 
     adapter = new ProductsByCatAdapter(ProductsByCategoryActivity.this, arrayList); 
     recycler.setHasFixedSize(true); 
     gridmanager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL); 
     gridmanager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_MOVE_ITEMS_BETWEEN_SPANS); 
     recycler.setLayoutManager(gridmanager); 
     recycler.setItemAnimator(null); 
     recycler.setAdapter(adapter); 

     searchview.setIconifiedByDefault(false); 
     searchview.setOnQueryTextListener(this); 
     searchview.setSubmitButtonEnabled(true); 
     searchview.setQueryHint("Search Here"); 

     String URL = Utility.PRODBYEVERYTHING; 
     prepareData(URL); 
    } 

    private void prepareData(final String URL) { 
     if (arrayList != null) arrayList.clear(); 

     StringRequest stringRequest = new StringRequest(Request.Method.GET, URL, 
       new Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         System.out.println("sammy_ProductsByCategoryActivity_response " + response); 

         try { 
          JSONObject jObj = new JSONObject(response); 
          if (jObj.getInt("ACK") == 1) { 
           JSONArray jsonArray = jObj.getJSONArray("all_products"); 
           for (int i = 0; i < jsonArray.length(); i++) { 
            JSONObject main = jsonArray.getJSONObject(i); 

            Model home = new Model(); 
            home.setTitle(main.getString("name")); 
            home.setImage(main.getString("image")); 
            home.setPrdid(main.getString("product_id")); 
            home.setUserid(main.getString("user_id")); 

            arrayList.add(home); 
           } 
          } 

          adapter.notifyDataSetChanged(); 
         } catch (JSONException e) { 
          System.out.println("sammy_JSONError " + e); 
         } 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       if (error instanceof TimeoutError) { 
        Toast.makeText(ProductsByCategoryActivity.this, getString(R.string.tooslow), Toast.LENGTH_LONG).show(); 
       } else if (error instanceof NoConnectionError) { 
        Toast.makeText(ProductsByCategoryActivity.this, getString(R.string.nointernet), Toast.LENGTH_LONG).show(); 
       } else if (error instanceof AuthFailureError) { 
        System.out.println("sammy_AuthFailureError " + error); 
       } else if (error instanceof ServerError) { 
        System.out.println("sammy_ServerError " + error); 
       } else if (error instanceof NetworkError) { 
        System.out.println("sammy_NetworkError " + error); 
       } else if (error instanceof ParseError) { 
        System.out.println("sammy_ParseError " + error); 
       } 
      } 
     }); 

     RequestQueue requestQueue = Volley.newRequestQueue(ProductsByCategoryActivity.this); 
     requestQueue.add(stringRequest); 
     stringRequest.setRetryPolicy(new DefaultRetryPolicy(
       10000, 
       DefaultRetryPolicy.DEFAULT_MAX_RETRIES, 
       DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); 
    } 


    @Override 
    public boolean onQueryTextSubmit(String query) { 
     return false; 
    } 

    @Override 
    public boolean onQueryTextChange(String newText) { 
     adapter.getFilter().filter(newText); 
     return true; 
    } 
} 

public class ProductsByCatAdapter extends RecyclerView.Adapter<ProductsByCatAdapter.MyViewHolder> implements Filterable { 

    private List<Model> arrayList; 
    private List<Model> mFilteredList; 
    private Context context; 
    private SharedPref pref; 

    public ProductsByCatAdapter(Context context, List<Model> arrayList) { 
     this.arrayList = arrayList; 
     this.mFilteredList = arrayList; 
     this.context = context; 
     pref = new SharedPref(context); 
    } 

    @Override 
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.rowlayout, parent, false); 

     return new MyViewHolder(itemView); 
    } 

    @Override 
    public Filter getFilter() { 
     return new Filter() { 
      @Override 
      protected FilterResults performFiltering(CharSequence charSequence) { 

       String charString = charSequence.toString(); 

       if (charString.isEmpty()) { 
        mFilteredList = arrayList; 
       } else { 
        ArrayList<Model> filteredList = new ArrayList<>(); 

        for (Model item : arrayList) { 
         if (item.getTitle().toLowerCase().contains(charString)) { 
          filteredList.add(item); 
         } 
        } 

        mFilteredList = filteredList; 
       } 

       FilterResults filterResults = new FilterResults(); 
       filterResults.values = mFilteredList; 
       return filterResults; 
      } 

      @Override 
      protected void publishResults(CharSequence charSequence, FilterResults filterResults) { 
       mFilteredList = (ArrayList<Model>) filterResults.values; 
       notifyDataSetChanged(); 
      } 
     }; 
    } 

    @Override 
    public void onBindViewHolder(final MyViewHolder holder, int position) { 
     Model model = arrayList.get(position); 
     holder.name.setText(model.getTitle()); 

     if (!TextUtils.isEmpty(model.getImage())) 
      Glide.with(context).load(model.getImage()).placeholder(R.drawable.defaultplaceholder).into(holder.image); 

    } 

    @Override 
    public int getItemCount() { 
     return mFilteredList.size(); 
    } 

    class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 
     TextView name; 
     ImageView image; 
     RelativeLayout relativeLayout; 

     MyViewHolder(View view) { 
      super(view); 
      name = (TextView) view.findViewById(R.id.titletxt); 
      image = (ImageView) view.findViewById(R.id.image); 
      relativeLayout = (RelativeLayout) view.findViewById(R.id.RL); 
      relativeLayout.setOnClickListener(this); 
     } 

     @Override 
     public void onClick(View view) { 
      switch (view.getId()) { 
       case R.id.RL: 
        int pos = getAdapterPosition(); 
        String prdid = arrayList.get(pos).getPrdid(); 
        String userid = arrayList.get(pos).getUserid(); 
        System.out.println("sammy_ProductsByCatAdapter_prdid " + prdid); 
        System.out.println("sammy_ProductsByCatAdapter_userid " + userid); 
        if (userid.equals(pref.getString(Utility.USERID))) { 
         Intent intent = new Intent(context, MyProductDetailsActivity.class); 
         intent.putExtra("prdid", prdid); 
         context.startActivity(intent); 
        } else { 
         Intent intent = new Intent(context, OtherProductDetailsActivity.class); 
         intent.putExtra("prdid", prdid); 
         context.startActivity(intent); 
        } 
        break; 
      } 
     } 
    } 
} 

Answer 1

ändern

Model model = arrayList.get(position); 

zu

Model model = mFilteredList.get(position); 

Answer 2

Ich glaube, Sie nicht versuchen, Filterklasse nennen sind mit in ProductsByCatAdapter Klasse ersetzen

public ProductsByCatAdapter(Context context, List<Model> arrayList) { 
    this.arrayList = arrayList; 
    this.mFilteredList = arrayList; 
    this.context = context; 
    pref = new SharedPref(context); 

    // add below line 
    getFilter(); 
}