如何使用NestedScrollView进行分页？

Question

当我使用嵌套滚动视图进行分页时，它需要花费太多时间，有时我的应用程序会挂起？请告诉我使用嵌套scrollview实现分页的正确方法

Answer 1

1.设置嵌套滚动，启用回收器视图的false。

recyclerView.setNestedScrollingEnabled（假）;

2.将滚动侦听器添加到nestedscrollview。

nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
                if (isFeedsFetchInProgress)
                    return;
                if(!mOnLastPage) {
                    int visibleItemCount = linearLayoutManager.getChildCount();
                    int totalItemCount = linearLayoutManager.getItemCount();
                    int pastVisibleItems = linearLayoutManager.findFirstVisibleItemPosition();
                    if (pastVisibleItems + visibleItemCount >= totalItemCount) {
                        //End of list
                        mPageToRequest++;
                        loader = LOADER.BOTTOM;
                        hitApiRequest(ApiConstants.REQUEST_TYPE.GET_REFERRAL_LIST);
                    }
                }
//                int topRowVerticalPosition = (recyclerView == null || recyclerView.getChildCount() == 0) ? 0 : recyclerView.getChildAt(0).getTop();
                swipeRefreshLayout.setEnabled(scrollY <= 0);

            }
        });

Answer 2

在您的包中添加此类

    import android.content.Context;
import android.support.v4.widget.NestedScrollView;
import android.util.AttributeSet;
import android.view.View;

public class TouchDetectableScrollView extends NestedScrollView {

    OnMyScrollChangeListener myScrollChangeListener;

    public TouchDetectableScrollView(Context context) {
        super(context);
    }

    public TouchDetectableScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TouchDetectableScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);

        if (myScrollChangeListener!=null)
        {
            if (t>oldt)
            {
                myScrollChangeListener.onScrollDown();
            }
            else if (t<oldt){
                myScrollChangeListener.onScrollUp();
            }
            View view = (View) getChildAt(getChildCount()-1);
            int diff = (view.getBottom()-(getHeight()+getScrollY()));
            if (diff == 0 ) {
                myScrollChangeListener.onBottomReached();
            }
        }
    }

    public OnMyScrollChangeListener getMyScrollChangeListener() {
        return myScrollChangeListener;
    }

    public void setMyScrollChangeListener(OnMyScrollChangeListener myScrollChangeListener) {
        this.myScrollChangeListener = myScrollChangeListener;
    }

    public interface OnMyScrollChangeListener
    {
            public void onScrollUp();
            public void onScrollDown();
            public void onBottomReached();
    }
}

现在在你的xml和java代码中使用TouchDetectableScrollView而不是NestedScrollView。并像这样设置Listener：

TouchDetectableScrollView nestedScrollView=findViewById(R.id.nestedScrollView);
        nestedScrollView.setMyScrollChangeListener(new TouchDetectableScrollView.OnMyScrollChangeListener() {
            @Override
            public void onScrollUp() {

            }

            @Override
            public void onScrollDown() {

            }

            @Override
            public void onBottomReached() {
                // api call for pagination
            }
        });

在onBottomReached方法中执行你的分页任务