Recyclerview 런타임 데이터 추가

Question

RecyclerView에서 데이터를 제한적으로 표시하고 싶습니다. 예를 들어, 데이터베이스에 1000 개의 레코드가있는 경우. 나는 단지 50을 가져오고 RecyclerView에 표시를하고 싶습니다. 그러나 사용자가 48 번째 위치로 스크롤하면 데이터베이스에서 50 개의 레코드를 더 가져와 RecyclerView에 추가하려고합니다.

나는 이미 Drawable 폴더에서 데이터를 가져 와서 정상적으로 작동하는 간단한 RecyclerView를 만들었습니다.

public class MyCustomAdapter extends RecyclerView.Adapter<MyCustomAdapter.MyViewHolder> { 

    Context context; 
    ArrayList<Information> data; 
    LayoutInflater inflater; 

    public MyCustomAdapter(Context context,ArrayList<Information> data){ 
     this.context=context; 
     this.data=data; 
     inflater=LayoutInflater.from(context); 
    } 

    @Override 
    public MyCustomAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

     View view=inflater.inflate(R.layout.item_row,parent,false); 
     MyViewHolder holder=new MyViewHolder(view); 
     return holder; 
    } 
    @Override 
    public void onBindViewHolder(MyViewHolder holder, int position) { 
     holder.text.setText(data.get(position).title); 
     holder.img.setImageResource(data.get(position).imgid); 

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

    //for getting refrences to img and txt row 
    public class MyViewHolder extends RecyclerView.ViewHolder{ 
     ImageView img; 
     TextView text; 
     public MyViewHolder(View itemView) { 
      super(itemView); 
      img= (ImageView) itemView.findViewById(R.id.img_row); 
      text= (TextView) itemView.findViewById(R.id.txt_row); 
     } 
    } 
} 

Answer 1

이를 달성하기 위해 EndlessRecyclerView 스크롤 리스터를 사용할 수 있습니다 다음

public class EndlessScrollRecyclListener extends RecyclerView.OnScrollListener 
    { 
    // The total number of items in the dataset after the last load 
    private int previousTotalItemCount = 0; 
    private boolean loading = true; 
    private int visibleThreshold = 5; 
    int firstVisibleItem, visibleItemCount, totalItemCount; 
    private int startingPageIndex = 0; 
    private int currentPage = 0; 

    @Override 
    public void onScrolled(RecyclerView mRecyclerView, int dx, int dy) 
    { 
     super.onScrolled(mRecyclerView, dx, dy); 
     LinearLayoutManager mLayoutManager = (LinearLayoutManager) mRecyclerView 
       .getLayoutManager(); 

     visibleItemCount = mRecyclerView.getChildCount(); 
     totalItemCount = mLayoutManager.getItemCount(); 
     firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition(); 
     onScroll(firstVisibleItem, visibleItemCount, totalItemCount); 
    } 

    public void onScroll(int firstVisibleItem, int visibleItemCount, int totalItemCount) 
    { 
     // If the total item count is zero and the previous isn't, assume the 
     // list is invalidated and should be reset back to initial state 
     if (totalItemCount < previousTotalItemCount) 
     { 
      this.currentPage = this.startingPageIndex; 
      this.previousTotalItemCount = totalItemCount; 
      if (totalItemCount == 0) 
      { 
       this.loading = true; 
      } 
     } 
     // If it’s still loading, we check to see if the dataset count has 
     // changed, if so we conclude it has finished loading and update the current page 
     // number and total item count. 
     if (loading && (totalItemCount > previousTotalItemCount)) 
     { 
      loading = false; 
      previousTotalItemCount = totalItemCount; 
      currentPage++; 
     } 

     // If it isn’t currently loading, we check to see if we have breached 
     // the visibleThreshold and need to reload more data. 
     // If we do need to reload some more data, we execute onLoadMore to fetch the data. 
     if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + 
       visibleThreshold)) 
     { 
      onLoadMore(currentPage + 1, totalItemCount); 
      loading = true; 
     } 
    } 

    // Defines the process for actually loading more data based on page 
    public abstract void onLoadMore(int page, int totalItemsCount); 

} 

하고 그냥

rvList.setOnScrollListener(new EndlessScroll...); 

Answer 2

당신이 당신의 목록보기에서 페이지 매김을 구현해야합니다.

이렇게하려면 많은 코드 작성 작업이 필요하지 않습니다.

링크를 참조하시기 바랍니다 : - https://github.com/nicolasjafelle/PagingListView