Android:无法解析方法“findFirstVisibleItemPosition()"? [英] Android: Cannot resolve method 'findFirstVisibleItemPosition()'?

问题描述

我正在尝试为回收站视图上的无限滚动编写代码.这是给我一个编译器错误的片段:

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 !");
                }

我之前写的声明是:

mLayoutManager = new LinearLayoutManager(this);

而 mLayoutManager 是 RecyclerView.LayoutManager 类的一个对象

And mLayoutManager is an object of class RecyclerView.LayoutManager

推荐答案

mLayoutManager is an object of class RecyclerView.LayoutManager 错误，应该使用android.support.v7.widget.mLayoutManager 的 LinearLayoutManager，所以:

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(); 在 onScrolled(...); 中调用应该没问题.

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

希望对您有所帮助！

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