动态更改GridLayoutManager的列数 [英] Dynamically change the number of columns of a GridLayoutManager

问题描述

我实际上在应用中使用了一个带有两列的GridLayoutManager，我想根据所使用的视图类型来设置一列。

这里是代码I在我的片段的方法onCreateView（）中：

  //用户的Recycler视图
 usersList =（ RecyclerView）mView.findViewById（R.id.usersList）; 
 
布局管理器（用户网格
 layoutManager = new GridLayoutManager（mContext，2）; 
 usersList.setLayoutManager（layoutManager）; 
 
 / / ArrayList of users 
 users = new ArrayList< User>（）; 
 
 //设置用户列表的适配器
 mHomeListAdapter = new HomeListAdapter（getActivity（），users ）; 
 usersList.setAdapter（mHomeListAdapter）; 
  

然后，在我的适配器中，这种类型的代码：

$ $ $ $ $ $ $ $ $ $
$ public int getItemViewType（int position）{
if（position == 5）{
return TYPE_PREMIUM;
} else {
return TYPE_ITEM;
}
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder（ViewGroup parent，int viewType）{
if（viewType == TYPE_PREMIUM）{
View view = mInflater.inflate（R.layout.become_premium，parent，false）;
HeaderViewHolder holder = new HeaderViewHolder（view）;
回报持有人;
} else {
View view = mInflater.inflate（R.layout.posts_item，parent，false）;
ViewHolderPosts holder = new ViewHolderPosts（view）;
回报持有者;




$ b所以，当使用视图TYPE_PREMIUM时，我想显示一个按钮（在一列中），并为其他结果使用正常的gridview（两列）。

是否可以这样做？

谢谢！

解决方案

  mGridLayoutManager = new GridLayoutManager（mContext，2）; 
 mGridLayoutManager.setSpanSizeLookup（onSpanSizeLookup）; 
 
 / ** 
 *辅助类根据方向和设备类型设置网格项的跨度大小
 * / 
 GridLayoutManager.SpanSizeLookup onSpanSizeLookup = new GridLayoutManager.SpanSizeLookup （）{
 @Override 
 public int getSpanSize（int position）{
 return mHomeListAdapter.getItemViewType（position）== TYPE_PREMIUM？ 2：1; 
} 
}; 
  

I am actually using a GridLayoutManager with two columns in my app and I would like to have one column depending on the view type used.

Here is the code I have in the method "onCreateView()" of my fragment :

// Recycler view for users
usersList = (RecyclerView) mView.findViewById(R.id.usersList);

// Layout manager (grid of users
layoutManager = new GridLayoutManager(mContext, 2);
usersList.setLayoutManager(layoutManager);

// ArrayList of users
users = new ArrayList<User>();

// Set the adapter for the list of users
mHomeListAdapter = new HomeListAdapter(getActivity(), users);
usersList.setAdapter(mHomeListAdapter);

Then, in my adapter, I have this kind of code :

@Override
public int getItemViewType(int position) {
    if (position == 5) {
        return TYPE_PREMIUM;
    } else {
        return TYPE_ITEM;
    }
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == TYPE_PREMIUM) {
        View view = mInflater.inflate(R.layout.become_premium, parent, false);
        HeaderViewHolder holder = new HeaderViewHolder(view);
        return holder;
    } else {
        View view = mInflater.inflate(R.layout.posts_item, parent, false);
        ViewHolderPosts holder = new ViewHolderPosts(view);
        return holder;
    }
}

So, when the view "TYPE_PREMIUM" is used, I would like to display a button (so in one column) and have a normal gridview (two columns) for the other results.

Is it possible to do this?

Thanks!

解决方案

mGridLayoutManager = new GridLayoutManager(mContext, 2);
mGridLayoutManager.setSpanSizeLookup(onSpanSizeLookup);    

/**
 * Helper class to set span size for grid items based on orientation and device type
 */
GridLayoutManager.SpanSizeLookup onSpanSizeLookup = new GridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        return mHomeListAdapter.getItemViewType(position) == TYPE_PREMIUM ? 2 : 1;
    }
};

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