android滚动视图里面的recyclerview的滚动事件 [英] scroll event for recyclerview inside scrollview android

问题描述

我在一个Scrollview中有2个水平和1个垂直(网格布局).

I have 2 horizontal and 1 vertical (Grid layout) in a single Scrollview.

<ScrollView>

<Horizontal RecyclerView/>

<Horizontal RecyclerView/>

<Vertical RecyclerView/>

</ScrollView>

以上是我的观点示意图.

Above is the schematic of my view.

一旦垂直recyclerviews的最后一项可见，我就必须加载数据，但是我无法获取垂直视图的滚动事件.

I have to load data on once the vertical recyclerviews last item is visible, but i'm unable to get the scroll event for my vertical view.

这是我的滚动浏览器.

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

                    totalItemCount = gridLayoutManager.getItemCount();
                    lastVisibleItem = gridLayoutManager.findLastVisibleItemPosition();
                    if (!loading && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
                        // End has been reached
                        // Do something
                        if(onLoadMoreListener!=null) {
                            onLoadMoreListener.onLoadMore(lastVisibleItem);
                        }
                        loading = true;
                    }
                }
            });

但是此setonscrollListener永远不会被触发.如何获得上述情况的滚动事件.

but this setonscrollListener is never fired. How do I get scroll event for above case.

提前感谢:)

推荐答案

我在这里遇到的问题是如何解决它:

I had the problem here is how to solve it:

1. 首先为滚动侦听器创建一个接口

1. First create an Interface for scroll listener

public interface EndlessScrollListener {
    void onScrollChanged(EndlessScrollView scrollView,int x, int y, int oldx, int oldy);
}

通过扩展ScrollView创建自定义ScrollView

Create a Custom ScrollView by extending the ScrollView

public class EndlessScrollView extends ScrollView
{
    private EndlessScrollListener endlessScrollListener  = null;
    public EndlessScrollView(Context context) {
        super(context);
    }

    public EndlessScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

    public void setScrollViewListener(EndlessScrollListener endlessScrollListener) {
        this.endlessScrollListener = endlessScrollListener;
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        if (endlessScrollListener != null) {
            endlessScrollListener.onScrollChanged(this, l, t, oldl, oldt);
        }
    }
}

然后在片段/活动"布局中使用EndlessScrollView而不是默认":

Then in your Fragment/Activity layout use the EndlessScrollView instead of Default one:

<YOUR_PACKAGE_NAME.EndlessScrollView
    android:id="@+id/my_scroll_view">

    <!--  your recycler views ... -->

</YOUR_PACKAGE_NAME.EndlessScrollView>

接下来，您的活动/片段"应该实现您在步骤1中创建的接口.

Next your Activity/Fragment should implement the Interface your created in step 1.

将活动/片段"设置为滚动侦听器"，然后像这样使用:

set your Activity/Fragment as Scroll Listener and then use like this:

public class YourActivity extends Activity implements EndlessScrollListener
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
    super.onCreate(savedInstanceState);

    EndlessScrollView myScrollView = (EndlessScrollView) findViewById(R.id.my_scroll_view);
    myScrollView.setScrollViewListener(this);
    }

    @Override
    public void onScrollChanged(EndlessScrollView scrollView, int x, int y, int oldx, int oldy) 
    {
        // We take the last son in the scrollview
        View view = scrollView.getChildAt(scrollView.getChildCount() - 1);
        int distanceToEnd = (view.getBottom() - (scrollView.getHeight() + scrollView.getScrollY()));

        // if diff is zero, then the bottom has been reached
        if (distanceToEnd == 0) {

            // do stuff your load more stuff

        }
    }
}

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