[英]Dynamically change the number of columns of a GridLayoutManager
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. 我实际上在我的应用程序中使用了一个带有两列的GridLayoutManager,我希望根据所使用的视图类型有一列。
Here is the code I have in the method "onCreateView()" of my fragment : 这是我片段的方法“onCreateView()”中的代码:
// 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 : 然后,在我的适配器中,我有这样的代码:
@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. 因此,当使用视图“TYPE_PREMIUM”时,我想显示一个按钮(所以在一列中)并且具有用于其他结果的普通网格视图(两列)。
Is it possible to do this? 是否有可能做到这一点?
Thanks! 谢谢!
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;
}
};
If I understand your question, you would like to let premium-type Views span 2 columns instead of 1? 如果我理解你的问题,你想让高级类型的视图跨越2列而不是1列? That's possible by setting a custom SpanSizeLookup with setSpanSizeLookup(SpanSizeLookup) .
通过使用setSpanSizeLookup(SpanSizeLookup)设置自定义SpanSizeLookup可以实现这一点 。
i was use an checkBox for changing my Layout manager columns. 我使用checkBox来更改我的布局管理器列。 you should use this to change GridLayoutManager columns .
你应该用它来改变GridLayoutManager列。 here is code :
这是代码:
checkBox = findViewById(R.id.change_manager);
checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (checkBox.isChecked()) {
layoutManager.setSpanCount(2);
isLayoutChange = true;
} else {
isLayoutChange = false;
layoutManager.setSpanCount(3);
}
}
});
and boolean for checking layoutManager Changes in onResume() , onRestart() and onPause() method. 和boolean用于检查layoutManager onResume() , onRestart()和onPause()方法的变化。 use it like this :
像这样用它:
if (isLayoutChange) {
layoutManager.setSpanCount(2);
} else {
layoutManager.setSpanCount(3);
}
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