[英]How to change RecyclerView LayoutManager from List to Grid?
I'm using a ViewPager in wich I have a RecyclerView, in this RecyclerView I want to change the LayoutManager from List to Grid.我正在使用 ViewPager,我有一个 RecyclerView,在这个 RecyclerView 中,我想将 LayoutManager 从 List 更改为 Grid。
I've implemented this code:我已经实现了这段代码:
void setLManager(boolean managerL){
GridLayoutManager glManager = new GridLayoutManager(viewPager.getContext(), 2);
if (mData.size() % 2 != 0) {
final int item = mData.size() - 1;
glManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
return position == item ? 2 : 1;
}
});
}
LinearLayoutManager lLManager = new LinearLayoutManager(viewPager.getContext());
recycler.setLayoutManager(managerL ? lLManager : glManager);
sAdapter.notifyDataSetChanged();
recycler.setAdapter(sAdapter);
}
On the RecyclerView's onCreateViewHolder I have the following code:在 RecyclerView 的 onCreateViewHolder 我有以下代码:
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v;
int layout = 0;
if(viewType == Util.LIST){
layout = R.layout.item_list;
}else {
layout = R.layout.item_grid;
}
v = LayoutInflater.from(mContext).inflate(layout, parent, false);
viewHolder = new RecyclerView.ViewHolder(v);
return viewHolder;
}
I make the change from List to Grid through a FloatingButton, changing the value of "managerL" (this is a boolean variable) so, when I press the button, the layouts change (from R.layout.item_list to R.layout_grid and viceverse), but the layout manager still showing the LinearLayoutManager. I make the change from List to Grid through a FloatingButton, changing the value of "managerL" (this is a boolean variable) so, when I press the button, the layouts change (from R.layout.item_list to R.layout_grid and viceverse ),但布局管理器仍显示 LinearLayoutManager。
I'd like to know, Why isn't my RecyclerViewManager changing?我想知道,为什么我的 RecyclerViewManager 没有改变?
I think you need to set the LayoutManager
AND Adapter
again after each click:我认为您需要在每次单击后再次设置LayoutManager
AND Adapter
:
private LinearLayoutManager lLManager;
private GridLayoutManager glManager;
private RecyclerView.Adapter sAdapter = ...
@Override
public View onCreateView(...) {
View viewPager = ...
lLManager = new LinearLayoutManager(viewPager.getContext());
glManager = new GridLayoutManager(viewPager.getContext(), 2);
if (mData.size() % 2 != 0) { ... }
setupRecycler();
viewPager.findViewById(R.id.myFab).setOnClickListener(new OnClickListener(){
public void onClick(View v) {
setupRecycler();
}
});
}
private void setupRecycler() {
recycler.setLayoutManager(managerL ? lLManager : glManager);
recycler.setAdapter(sAdapter);
}
Note: I'm pretty sure you don't need to call notifyDataSetChanged
if you reset the adapter.注意:如果您重置适配器,我很确定您不需要调用notifyDataSetChanged
。
I found what was the problem I had in my code and with this, I found a solution, the problem was in the adapter of my ViewPager, and I found the solution in this answer: https://stackoverflow.com/a/18710611我发现我的代码中有什么问题,我找到了一个解决方案,问题出在我的 ViewPager 的适配器中,我在这个答案中找到了解决方案: https://stackoverflow.com/a/18710611
The reason why my RecyclerView didn't change from LayoutManager, was that in my ViewPager adapter it showed the RecyclerView layout with a LayoutInflater, and for some reason this made my RecyclerView not make the change from list to grid, in the link I left above, there is a better way to create the adapter for the ViewPager and it was the one that worked for me.我的 RecyclerView 没有从 LayoutManager 更改的原因是,在我的 ViewPager 适配器中,它显示了带有 LayoutInflater 的 RecyclerView 布局,并且由于某种原因,这使得我的 RecyclerView 没有在我上面留下的链接中从列表更改为网格,有一种更好的方法可以为 ViewPager 创建适配器,它对我有用。
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