回收器视图不调用onCreateViewHolder
回收器视图不调用onCreateViewHolder
提问于 2015-01-07 08:18:02
我的RecyclerView不调用onCreateViewHolder、onBindViewHolder甚至MenuViewHolder构造函数，因此RecyclerView中没有任何内容。我将日志放入调试，但没有显示日志。可能的问题是什么？
我的适配器：
public class MenuAdapter extends RecyclerView.Adapter<MenuAdapter.MenuViewHolder> {
private LayoutInflater inflater;
List<Menu> data = Collections.emptyList();
public MenuAdapter(Context context, List<Menu> data) {
Log.i("DEBUG", "Constructor");
inflater = LayoutInflater.from(context);
Log.i("DEBUG MENU - CONSTRUCTOR", inflater.toString());
this.data = data;
for(Menu menu: this.data){
Log.i("DEBUG MENU - CONSTRUCTOR", menu.menu);
}
}
@Override
public MenuViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.row_menu, parent, false);
MenuViewHolder holder = new MenuViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(MenuViewHolder holder, int position) {
Log.i("DEBUG MENU", "onBindViewHolder");
Menu current = data.get(position);
holder.title.setText(current.menu);
}
@Override
public int getItemCount() {
return 0;
}
class MenuViewHolder extends RecyclerView.ViewHolder {
TextView title;
ImageView icon;
public MenuViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.menuText);
}
}我的自定义行XML：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/menuText"
android:text="Dummy Text"
android:layout_gravity="center_vertical"
android:textColor="#222"/>
和我的片段：
public NavigationFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUserLearnedDrawer = Boolean.valueOf(readFromPreferences(getActivity(), KEY_USER_LEARNED_DRAWER, "false"));
if (savedInstanceState != null) {
mFromSavedInstaceState = true;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_navigation, container, false);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.drawer_list);
MenuAdapter adapter = new MenuAdapter(getActivity(), getData());
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(adapter);
return view;
}回答 29
Stack Overflow用户
回答已采纳
发布于 2015-01-07 08:24:38
您的getItemCount方法returns 0。因此，RecyclerView永远不会尝试实例化视图。让它返回一些greater than 0。
例如
@Override
public int getItemCount() {
return data.size();
}Stack Overflow用户
发布于 2015-09-29 18:55:21
另一个是确保将布局管理器设置为RecyclerView：
recycler.setLayoutManager(new LinearLayoutManager(this));Stack Overflow用户
发布于 2018-01-27 04:17:46
我忘了添加下面这行后，我添加了它为我工作
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/27809524
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