安卓：无法解析法“findFirstVisibleItemPosition（）”？ [英] Android: Cannot resolve method 'findFirstVisibleItemPosition()'?

问题描述

我试图写一个$ C $下一个回收视图无尽的滚动。这是片段，给了我一个编译器错误：

I'm trying to write a code for endless scroll on a recycler view. This is the snippet that gives me a compiler error:

@Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

                visibleItemCount = mLayoutManager.getChildCount();
                totalItemCount = mLayoutManager.getItemCount();
                pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();

                if ( (visibleItemCount+pastVisiblesItems) >= totalItemCount) {
                    Log.v("...", "Last Item Wow !");
                }

和我写之前，它也是宣言：

And the declaration I've written before is:

mLayoutManager = new LinearLayoutManager(this);

和mLayoutManager是类RecyclerView.LayoutManager

And mLayoutManager is an object of class RecyclerView.LayoutManager

推荐答案

mLayoutManager是类RecyclerView.LayoutManager的对象是不对的，你应该使用 android.support.v7.widget.LinearLayoutManager 为 mLayoutManager ，这样：

mLayoutManager is an object of class RecyclerView.LayoutManager is wrong, you should use android.support.v7.widget.LinearLayoutManager for mLayoutManager, so:

mLayoutManager = new LinearLayoutManager(this); 
//above 'LinearLayoutManager' is from
//'android.support.v7.widget.LinearLayoutManager'

mRecyclerView.setLayoutManager(mLayoutManager);

然后 mLayoutManager.findFirstVisibleItemPosition（）; 调用应该是确定的 onScrolled（...）;

then mLayoutManager.findFirstVisibleItemPosition(); call should be ok in onScrolled(...);.

希望这有助于！

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