Question

我知道以前曾经问过，但我没有赢。我的网络服务器上有一组包含数千条记录的数据，我想一次填充我的Recyclerview列表20。我该如何从阵列加载数据？我不认为一次加载所有一千个是最佳选择，因为它耗费时间并且还使用大量数据。我有以下代码，允许我检测是否已使用静态数据到达当前列表的末尾，但我不知道如何实现异步任务。

这是我的滚动监听器：

public abstract class EndlessRecyclerScroll extends RecyclerView.OnScrollListener {

    public static String TAG = EndlessRecyclerScroll.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 linearLayoutManager;

    public EndlessRecyclerScroll(LinearLayoutManager linearLayoutManager){
        this.linearLayoutManager  = linearLayoutManager;
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy){
        super.onScrolled(recyclerView,dx,dy);
        visibleItemCount = recyclerView.getChildCount();
        totalItemCount = linearLayoutManager.getItemCount();
        firstVisibleItem = linearLayoutManager.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);
}

这是我的主要活动，提供静态数据：

public class MainActivity extends AppCompatActivity {
    List<String> list;
    RecyclerView recyclerView;
    LinearLayoutManager linearLayoutManager;
    RVAdapter rvAdapter;
    private static int current_page = 1;
    private int ival = 1;
    private int loadLimit = 10;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        list = new ArrayList<>();
        loadData(current_page);
        setRecyclerView();
        recyclerView.setOnScrollListener(new EndlessRecyclerScroll(linearLayoutManager) {
            @Override
            public void onLoadMore(int current_page) {
                loadMoreData(current_page);
            }
        });
    }

    void setRecyclerView(){
        recyclerView = (RecyclerView)findViewById(R.id.itemRV);
        recyclerView.setHasFixedSize(true);
        linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        rvAdapter = new RVAdapter(list);
        recyclerView.setAdapter(rvAdapter);

    }

    void loadData(int current_page){
        for (int i = ival; i <= loadLimit; i++) {
            list.add("Item "+i);
            ival++;
        }
    }
    private void loadMoreData(int current_page) {

        // I have not used current page for showing demo, if u use a webservice
        // then it is useful for every call request

        loadLimit = ival + 10;

        for (int i = ival; i <= loadLimit; i++) {
            list.add("Item "+i);
            ival++;
        }

        rvAdapter.notifyDataSetChanged();

    }

我从这里遵循指南来实现这一目标：http://android-pratap.blogspot.com/2015/01/endless-recyclerview-onscrolllistener.html?m=1

帮助？请

Answer 1

好的，我设法解决了这个问题，我猜我起初只是懒惰。所以我所要做的就是理解PHP分页的概念，并将增加的页码发送到php脚本。

对于那些可能对这件事情不熟悉的人，请按照以下两个链接：

http://android-pratap.blogspot.com/2015/01/endless-recyclerview-onscrolllistener.html?m=1

http://www.phpfreaks.com/tutorial/basic-pagination

无尽的RecyclerView滚动

1 个答案: