Layout_behavior，其中一个适配器位于另一个适配器中 [英] Layout_behavior with an Adapter inside another one
问题描述
我一直在搜索，发现了一些很接近的问题和答案，但是没有一个起作用.
I have been searching and found some close questions and answer but none of them works.
我正在将 CoordinatorLayout 用于带有 AppBarLayout 和 ToolBar 的列表 RecyclerView .
I'm using CoordinatorLayout for a list RecyclerView with AppBarLayout and ToolBar.
我的目标:
思想很简单，当您首先滚动视图时，在工具栏中折叠AppBar，然后再滚动RecyclerView.
The ideia is very simple, when you roll the view first the AppBar Collapse in the Toolbar and after that the RecyclerView start to scroll.
我的层次结构:
我的片段RecyclerView(垂直)有一个具有新布局的Adapter-A，此适配器为RecyclerView(水平)调用了另一个适配器B.
My Fragment RecyclerView(vertical) has a Adapter-A with a new layout, and this adapter call a second adapter-B for the RecyclerView(horizontal).
所以我有一个像这样的结构: (不是代码，只是为了展示其工作原理)
So I Have a struct like this: (is not a code, just to show how works)
Fragment AppBarLayout{..}
Fragment Recycler View (Vertical) {
Adapter-A Text;
Adapter-A Recycler View (Horizontal){
Adapter-B Img;
Adapter-B Text;
}
}
出了什么问题
如果我单击RecyclerView(垂直)或Adapter-A图，则可以正常工作.
If I click in the RecyclerView(Vertical) or Adapter-A Img it works fine.
但是，如果我单击适配器B的内容(图和文本)，则会滚动两个回收者视图"，但不会滚动AppBar.
But If I click in Adapter B content(Img and Text) it scroll both Recycler Views but not the AppBar.
我在做什么:
我使用
app:layout_behavior ="@ string/appbar_scrolling_view_behavior"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
recyclerList.setHasFixedSize(true)
recyclerList.setHasFixedSize(true)
recyclerList.setNestedScrollingEnabled(true);
recyclerList.setNestedScrollingEnabled(true);
在两个回收站"视图中.
in both Recycler Views.
app:layout_scrollFlags ="scroll | exitUntilCollapsed | enterAlways"
app:layout_scrollFlags="scroll|exitUntilCollapsed|enterAlways"
在CollapsingToolbarLayout中
in the CollapsingToolbarLayout
我尝试用Java代码制作此代码:
recyclerList.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// If AppBar is fully expanded, revert the scroll.
if (!shouldScroll) {
recyclerList.scrollToPosition(0);
//Here I should make the AppBar Scroll, but AppBarLayout.scrollTo(dx, dy) don't work.
}
}
});
mainHomeAppBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
shouldScroll = verticalOffset != 0;
}
});
我的代码:
mainHome.xml
mainHome.xml
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/main_home_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.design.widget.AppBarLayout
android:id="@+id/main_home_app_bar_layout"
android:layout_width="match_parent"
android:layout_height="192dp"
android:background="@drawable/gradient_bg">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed|enterAlways">
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="50dp"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
mainHome.java
mainHome.java
@Override
protected void assignViews() {
mainHomeList = (RecyclerView) findViewById(R.id.main_home_list);
mainHomeAppBarLayout = (AppBarLayout) findViewById(R.id.main_home_app_bar_layout);
}
@Override
protected void prepareViews() {
mainHomeList.setHasFixedSize(true);
mainHomeList.setNestedScrollingEnabled(true);
linearLayoutManager = new LinearLayoutManager(getApplicationContext());
mainHomeList.setLayoutManager(linearLayoutManager);
initAdapterIfNecessary();
if (mainHomeList.getAdapter() == null)
mainHomeList.setAdapter(adapter);
}
adapter-A.java
adapter-A.java
public class MainHomeModulesAdapter extends RecyclerView.Adapter<MainHomeModulesAdapter.GroupViewHolder> {
private OnListItemClickedListener onListItemClickedListener = null;
private OnListItemClickedTwoListener onListItemClickedTwoListener = null;
private ArrayList<JSONMainModule> mainModules = new ArrayList<>();
@Override
public MainHomeModulesAdapter.GroupViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
View itemView = LayoutInflater.from(context).inflate(R.layout.a_main_home_module_item, parent, false);
return (new MainHomeModulesAdapter.GroupViewHolder(itemView));
}
@Override
public void onBindViewHolder(MainHomeModulesAdapter.GroupViewHolder holder, int position) {
//Place where put layout information
holder.mainHomeModuleList.setLayoutManager(new GridLayoutManager(context, Utils.calcGridSpaceCount(context, 2))); //For two elements
holder.mainHomeModuleList.setAdapter(holder.mainHomeContentAdapter);
holder.mainHomeContentAdapter.updateListContent(mainModules.get(position).getModuleContent(), mainModules.get(position).getModule());
}
@Override
public int getItemCount() {
return mainModules.size();
}
public void setOnListItemClickedListener(OnListItemClickedListener onListItemClickedListener) {
this.onListItemClickedListener = onListItemClickedListener;
}
public void setOnListItemClickedTwoListener(OnListItemClickedTwoListener onListItemClickedTwoListener){
this.onListItemClickedTwoListener = onListItemClickedTwoListener;
}
public void updateListContent(ArrayList<JSONMainModule> mainModules) {
this.mainModules = mainModules;
notifyDataSetChanged();
}
public JSONMainModule getListContent(int pos) {
return mainModules.get(pos);
}
class GroupViewHolder extends ParentViewHolder {
TextView mainHomeModuleText;
Button mainHomeModuleBtn;
RecyclerView mainHomeModuleList;
MainHomeContentAdapter mainHomeContentAdapter; //Adapter-B
private GroupViewHolder(View itemView) {
super(itemView);
mainHomeModuleText = (TextView) itemView.findViewById(R.id.main_home_module_title);
mainHomeModuleBtn = (Button) itemView.findViewById(R.id.main_home_module_btn);
mainHomeModuleBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ATUtils.isDoubleClick()) return;
onListItemClickedListener.onClicked(getAdapterPosition());
}
});
//Child - Main Contents
mainHomeModuleList = (RecyclerView) itemView.findViewById(R.id.main_home_module_list);
mainHomeModuleList.setHasFixedSize(true);
mainHomeModuleList.setNestedScrollingEnabled(true);
mainHomeContentAdapter = new MainHomeContentAdapter();
mainHomeContentAdapter.setOnListItemClickedListener(new OnListItemClickedListener() {
@Override
public void onClicked(int pos) {
onListItemClickedTwoListener.onClicked(pos, getAdapterPosition());
}
});
}
}
}
推荐答案
找到了解决方案.
在创建父垂直列表视图"时，将setNestedScrollingEnabled设置为true. 并且在创建子级Horizontal ListView时将setNestedScrollingEnabled设置为false.
When create the parent Vertical ListView set setNestedScrollingEnabled as true. And when create the child Horizontal ListView set setNestedScrollingEnabled as false.
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