Recyclerview無盡的滾動刷新頁面

Question

我有一個recyclerview，我試圖用這個popular android Endless scroll Library實現無盡的滾動。它幾乎運行良好，除了當我到達當前列表的按鈕時，它會重新加載並從頂部開始，而不是從最後一個可見項繼續。

這是我的Scroll Listerner。

scrollListener = new EndlessRecyclerViewScrollListener(manager) { 
     @Override 
     public void onLoadMore(int page, int totalItemsCount, RecyclerView view) { 
      // Triggered only when new data needs to be appended to the list 
      // Add whatever code is needed to append new items to the bottom of the list 
      loadMore(page); 
      ++page; 
     } 
    }; 

    mRecyclerView.addOnScrollListener(scrollListener); 

這是我loadMore（）

public void loadMore(int page) { 

    String url = myurl + page; 
    StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() { 
     @Override 
     public void onResponse(String response) { 
      //Log.i("Responses", response); 
      ArrayList<Deal> deals = new JsonConverter<Deal>().toArrayList(response, Deal.class); 
      dealArrayList.addAll(deals); 
      adapter = new DealAdapter(getApplicationContext(), dealArrayList); 
      mRecyclerView.setAdapter(adapter); 
      newList = deals; 
      adapter.notifyItemRangeInserted(newList.size(), dealArrayList.size()); 
      stopAnim(); 


     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.d(TAG, error.toString()); 
      Toast.makeText(getApplicationContext(), "Bad Network Connection. Please Try Again", Toast.LENGTH_LONG).show(); 
      stopAnim(); 

     } 
    } 
    ); 

    int socketTimeout = 30000; // 30 seconds. You can change it 
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, 
      DefaultRetryPolicy.DEFAULT_MAX_RETRIES, 
      DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); 

    stringRequest.setRetryPolicy(policy); 
    MySingleton.getInstance(getApplicationContext()).addToRequestQueue(stringRequest); 
    mSwipeRefresh.setRefreshing(false); 


} 

我無法弄清楚什麼是錯。 幫助。

編輯.. 當我第一次午餐時，我的應用程序調用這個函數，然後當我滾動時調用loadMore函數。

public void firstRun(int page) { 

    String url = myurl + page; 
    StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() { 
     @Override 
     public void onResponse(String response) { 
      Log.i("Responses", response); 
      dealArrayList = new JsonConverter<Deal>().toArrayList(response, Deal.class); 
      adapter = new DealAdapter(getApplicationContext(), dealArrayList); 
      mRecyclerView.setAdapter(adapter); 
      newList = dealArrayList; 
      adapter.notifyDataSetChanged(); 
      stopAnim(); 


     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.d(TAG, error.toString()); 
      Toast.makeText(getApplicationContext(), "Bad Network Connection. Please Try Again", Toast.LENGTH_LONG).show(); 
      stopAnim(); 

     } 
    } 
    ); 

    int socketTimeout = 30000; // 30 seconds. You can change it 
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, 
      DefaultRetryPolicy.DEFAULT_MAX_RETRIES, 
      DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); 

    stringRequest.setRetryPolicy(policy); 
    MySingleton.getInstance(getApplicationContext()).addToRequestQueue(stringRequest); 
    mSwipeRefresh.setRefreshing(false); 


} 

這是我的適配器

public class DealAdapter extends RecyclerView.Adapter<DealAdapter.ViewHolder> { 
private Context context; 
private ArrayList<Deal> deals; 

public DealAdapter(Context context, ArrayList<Deal> deals) { 
    this.context = context; 
    this.deals = deals; 
} 

@Override 
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    LayoutInflater inflater = LayoutInflater.from(parent.getContext()); 
    View view = inflater.inflate(R.layout.card_view, parent, false); 
    final ViewHolder holder = new ViewHolder(view); 


    return holder; 
} 

@Override 
public void onBindViewHolder(final ViewHolder holder, int position) { 
    Deal deal = deals.get(position); 
    holder.mCardTitle.setText(deal.title); 
    holder.mCardLocation.setText(deal.location); 
    holder.mCardDiscount.setText(String.valueOf(deal.discount)); 
    holder.mCardPrice.setText(deal.price); 
    holder.mCardContact.setText(deal.contact); 
    holder.mCardDescription.setText(deal.description); 
    String url = myurl + deal.image; 
    Picasso.with(context) 
      .load(url).resize(0,300) 
      .placeholder(R.drawable.load) 
      .error(android.R.drawable.stat_notify_error) 
      .into(holder.mCardImage); 


    holder.mCardDescription.setOnClickListener(new View.OnClickListener() { 
     boolean isClicked = false; 
     @Override 
     public void onClick(View v) { 
      if(isClicked){ 
       //This will shrink textview to 2 lines if it is expanded. 
       holder.mCardDescription.setMaxLines(2); 
       holder.more.setVisibility(View.VISIBLE); 
       holder.mCardInvisible.setVisibility(View.GONE); 
       isClicked = false; 
      } else { 
       //This will expand the textview if it is of 2 lines 
       holder.mCardDescription.setMaxLines(Integer.MAX_VALUE); 
       holder.more.setVisibility(View.GONE); 
       holder.mCardInvisible.setVisibility(View.VISIBLE); 
       isClicked = true; 
      } 
     } 
    }); 

} 

@Override 
public int getItemCount() { 
    if (deals != null) { 
     return deals.size(); 
    }else{ 
     return 0; 
    } 
} 

static class ViewHolder extends RecyclerView.ViewHolder { 

    private TextView mCardTitle; 
    private ImageView mCardImage; 
    private TextView mCardLocation; 
    private TextView mCardDescription; 
    private TextView mCardContact; 
    private TextView mCardPrice; 
    private TextView mCardDiscount, more; 
    private LinearLayout mCardInvisible; 

    private ViewHolder(View itemView) { 
     super(itemView); 
     mCardTitle = (TextView) itemView.findViewById(R.id.mCardTitle); 
     mCardImage = (ImageView) itemView.findViewById(R.id.mCardImage); 
     mCardLocation = (TextView) itemView.findViewById(R.id.mCardLocation); 
     mCardDescription = (TextView) itemView.findViewById(R.id.mCardDescription); 
     mCardContact = (TextView) itemView.findViewById(R.id.mCardContact); 
     mCardPrice = (TextView) itemView.findViewById(R.id.mCardPrice); 
     mCardDiscount = (TextView) itemView.findViewById(R.id.mCardDiscount); 
     more = (TextView) itemView.findViewById(R.id.mCardMore); 
     mCardInvisible = (LinearLayout) itemView.findViewById(R.id.mCardInvisible); 

    } 


} 

}

編輯::這是我OnRefresh監聽

mSwipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
     @Override 
     public void onRefresh() { 
      new Handler().postDelayed(new Runnable() { 
       @Override 
       public void run() { 
        firstRun(1); 
       } 
      }, 3000); 

     } 
    }); 

Answer 1

在適配器中添加合併數據你一個新功能與新的：

public void addAll(List data){ 
    deals.addAll(data); 
    notifyDataSetChanged(); 
} 

你在loadMore功能onResponse應該像：

public void onResponse(String response) { 
    //Log.i("Responses", response); 
    ArrayList<Deal> deals = new JsonConverter<Deal>().toArrayList(response, Deal.class); 
    adapter.addAll(deals); 
    stopAnim(); 
}