我正在关注this教程,并尝试为每个单独的用户而不是专辑创建一个配置文件页面。但是,我正在使用片段而不是活动,并意识到我的代码将与教程有所不同。片段getActivity不起作用
我已经使用了Android开发人员文档和我自己的知识来修复大部分从活动转移到片段的错误,但是我似乎无法找到解决此问题的任何帮助,不胜感激。
我有下面的代码工作正常:
recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler_view);
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getActivity(), 2);
recyclerView.setLayoutManager(mLayoutManager);
但是当我尝试添加到回收视图我得到一个错误:
recyclerView.addItemDecoration(new GridSpacingItemDecoration(2, dpToPx(10), true));
Cant resolve symbol GridSpacingItemDecoration
Cant resolve method dpToPx(int)
下面是它的类作为要求
public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
private int spanCount;
private int spacing;
private boolean includeEdge;
public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
this.spanCount = spanCount;
this.spacing = spacing;
this.includeEdge = includeEdge;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view); // item position
int column = position % spanCount; // item column
if (includeEdge) {
outRect.left = spacing - column * spacing/spanCount; // spacing - column * ((1f/spanCount) * spacing)
outRect.right = (column + 1) * spacing/spanCount; // (column + 1) * ((1f/spanCount) * spacing)
if (position < spanCount) { // top edge
outRect.top = spacing;
}
outRect.bottom = spacing; // item bottom
} else {
outRect.left = column * spacing/spanCount; // column * ((1f/spanCount) * spacing)
outRect.right = spacing - (column + 1) * spacing/spanCount; // spacing - (column + 1) * ((1f/ spanCount) * spacing)
if (position >= spanCount) {
outRect.top = spacing; // item top
}
}
}
}
将'GridSpacingItemDecoration'和'dpToPx()'复制到您的片段。 – tynn
不用担心我解决了这个问题,这是由于我创建了另一个课程 – UCLCoder
所以,现在你的问题解决了吗? @UCLCoder –