GridLayoutManager с EndlessRecyclerOnScrollListener не работает должным образом андроида

Question

я wnat интегрировать endlessrecyclerview с веб seervice данных в GridLayoutManager так ниже мой код

public class GridRecycle extends AppCompatActivity { 

RecyclerView mRecyclerView; 
private GridLayoutManager mLayoutManager; 
ArrayList<GetProductListing.ListingBlock>rowListItem; 
GetProductListing mGetProductListing; 
PostParseGet mPostParseGet; 
int pager=1; 
RecyclerViewAdapter rcAdapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.layout_gird); 
    rowListItem=new ArrayList<>(); 
    mPostParseGet=new PostParseGet(GridRecycle.this); 
    mGetProductListing=new GetProductListing(); 
    mRecyclerView=(RecyclerView)findViewById(R.id.recycler_view); 
    mLayoutManager = new GridLayoutManager(GridRecycle.this, 2); 

    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); 
    mRecyclerView.setHasFixedSize(true); 
    mRecyclerView.setLayoutManager(mLayoutManager); 
    new getData().execute(); 



    mRecyclerView.setOnScrollListener(new EndlessRecyclerOnScrollListener(
      mLayoutManager) { 
     @Override 
     public void onLoadMore(int current_page) { 
      pager++; 
      new getData().execute(); 
     } 

    }); 
} 

public class getData extends AsyncTask<Void,Void,Void> 
{ 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
    } 

    @Override 
    protected Void doInBackground(Void... voids) { 
     mGetProductListing=(GetProductListing)mPostParseGet.getProductDataWithSlug(mGetProductListing,pager); 

     return null; 
    } 

    @Override 
    protected void onPostExecute(Void aVoid) { 
     super.onPostExecute(aVoid); 
     if (mGetProductListing.getListing().getData().size()>0) 
     { 
      rowListItem=getProductBlock(); 
      rcAdapter= new RecyclerViewAdapter(GridRecycle.this, Tags.mAllListingBlocks); 
      mRecyclerView.setAdapter(rcAdapter); 
      rcAdapter.notifyDataSetChanged(); 
     } 
    } 
} 
public ArrayList<GetProductListing.ListingBlock> getProductBlock() { 
    ArrayList<GetProductListing.ListingBlock> mArrayListParserLog = new ArrayList<GetProductListing.ListingBlock>(); 


    for (int i = 0; i < mGetProductListing.getListing().getData().size(); i++) { 
     GetProductListing.ListingBlock mParserLog = new GetProductListing.ListingBlock(); 

     mParserLog.setId(mGetProductListing.getListing().getData().get(i).getId()); 
     mParserLog.setTitle(mGetProductListing.getListing().getData().get(i).getTitle()); 
     mParserLog.setDiscountSale(mGetProductListing.getListing().getData().get(i).getDiscountSale()); 
     mParserLog.setDiscountSelling(mGetProductListing.getListing().getData().get(i).getDiscountSelling()); 
     mParserLog.setPrice(mGetProductListing.getListing().getData().get(i).getPrice()); 
     mParserLog.setSale_end(mGetProductListing.getListing().getData().get(i).getSale_end()); 
     if (mGetProductListing.getListing().getData().get(i).getSale_price()!=null && !mGetProductListing.getListing().getData().get(i).getSale_price().isEmpty()) 
     { 
      mParserLog.setSale_price(mGetProductListing.getListing().getData().get(i).getSale_price()); 

     } 
     else 
     { 
      mParserLog.setSale_price("0"); 

     } 
     mParserLog.setSale_start(mGetProductListing.getListing().getData().get(i).getSale_start()); 
     mParserLog.setSelling_price(mGetProductListing.getListing().getData().get(i).getSelling_price()); 
     mParserLog.setProduct_rating(mGetProductListing.getListing().getData().get(i).getProduct_rating()); 
     mParserLog.setSlug(mGetProductListing.getListing().getData().get(i).getSlug()); 
     mParserLog.setSold_out(mGetProductListing.getListing().getData().get(i).getSold_out()); 
     mParserLog.setImage(mGetProductListing.getListing().getData().get(i).getImage()); 
     mParserLog.setSku_id(mGetProductListing.getListing().getData().get(i).getSku_id()); 
     mParserLog.setMedium_image(mGetProductListing.getListing().getData().get(i).getMedium_image()); 
     mArrayListParserLog.add(mParserLog); 
     Tags.mAllListingBlocks.add(mParserLog); 

    } 
    return mArrayListParserLog; 
} 

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders> { 

    private List<GetProductListing.ListingBlock> itemList; 
    private Context context; 

    public RecyclerViewAdapter(Context context, List<GetProductListing.ListingBlock> itemList) { 
     this.itemList = itemList; 
     this.context = context; 
    } 

    @Override 
    public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) { 

     View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_reow, null); 
     RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView); 
     return rcv; 
    } 

    @Override 
    public void onBindViewHolder(RecyclerViewHolders holder, final int position) { 
     holder.name.setText(itemList.get(position).getTitle()); 
     holder.price.setText(itemList.get(position).getPrice()); 


    } 

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

EndlessRecyclerOnScrollListener.java

public abstract class EndlessRecyclerOnScrollListener extends 
    RecyclerView.OnScrollListener { 
public static String TAG = EndlessRecyclerOnScrollListener.class 
     .getSimpleName(); 

private int previousTotal = 0; 
private boolean loading = true; 
private int visibleThreshold = 5; 
int firstVisibleItem, visibleItemCount, totalItemCount; 

private int current_page = 1; 

private LinearLayoutManager mLinearLayoutManager; 

public EndlessRecyclerOnScrollListener(
     LinearLayoutManager linearLayoutManager) { 
    this.mLinearLayoutManager = linearLayoutManager; 
} 

@Override 
public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
    super.onScrolled(recyclerView, dx, dy); 

    visibleItemCount = recyclerView.getChildCount(); 
    totalItemCount = mLinearLayoutManager.getItemCount(); 
    firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition(); 

    if (loading) { 
     if (totalItemCount > previousTotal) { 
      loading = false; 
      previousTotal = totalItemCount; 
     } 
    } 
    if (!loading 
      && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) { 
     // End has been reached 

     // Do something 
     current_page++; 

     onLoadMore(current_page); 

     loading = true; 
    } 
    } 

public abstract void onLoadMore(int current_page); 
} 

когда я запускаю выше код и прокрутите вниз в это время мой recycleview сосредоточиться на вершине снова и снова, не прокручивая вниз непрерывно? так что любая идея, как я могу решить эту проблему? ваши все предложения заметны

Answer 1

Использование addOnScrollListener() вместо setOnScrollListener()

listRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { 
     @Override 
     public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
      super.onScrolled(recyclerView, dx, dy); 


     } 
    }); 

Answer 2

Снимите следующие 2 строки из класса getData-> onPostExecute.

rcAdapter= new RecyclerViewAdapter(GridRecycle.this, Tags.mAllListingBlocks); 
      mRecyclerView.setAdapter(rcAdapter); 

и добавить эти строки (выше 2 линии) в GridRecycle.java-> OnCreate, ниже этой линии

mRecyclerView.setLayoutManager(mLayoutManager); 

Answer 3

Я решить мою проблему

public abstract class EndlessRecyclerGridOnScrollListener extends 
RecyclerView.OnScrollListener { 
public static String TAG = EndlessRecyclerGridOnScrollListener.class 
    .getSimpleName(); 

    private int previousTotal = 0; 
    private boolean loading = true; 
    private int visibleThreshold = 5; 
    int firstVisibleItem, visibleItemCount, totalItemCount; 

    private int current_page = 1; 

    private GridLayoutManager mLinearLayoutManager; 

    public EndlessRecyclerGridOnScrollListener(
    GridLayoutManager linearLayoutManager) { 
    this.mLinearLayoutManager = linearLayoutManager; 
} 

    @Override 
public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
super.onScrolled(recyclerView, dx, dy); 

visibleItemCount = recyclerView.getChildCount(); 
totalItemCount = mLinearLayoutManager.getItemCount(); 
firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition(); 

if (loading) { 
    if (totalItemCount > previousTotal) { 
     loading = false; 
     previousTotal = totalItemCount; 
    } 
} 
if (!loading 
     && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) { 
    // End has been reached 

    // Do something 
    current_page++; 

    onLoadMore(current_page); 

    loading = true; 
    } 
} 

    public abstract void onLoadMore(int current_page); 
} 

в GridRecycle .java файл

mGridView.setOnScrollListener(new EndlessRecyclerGridOnScrollListener(
     mLayoutManagerGrid) { 
    @Override 
    public void onLoadMore(int current_page) { 
     if (Tags.mArrayListingAllProductBlocks.size() < totalitem) { 
      page++; 
      new productList().execute(); 
     } 
    } 

}); 

и удалить 2 строки в методе onPost

rcAdapter= new RecyclerViewAdapter(GridRecycle.this, Tags.mAllListingBlocks); 
mRecyclerView.setAdapter(rcAdapter);