Android:RecyclerView:未连接适配器;跳过布局 [英] Android: RecyclerView: No adapter attached; skipping layout
问题描述
当显示RecyclerView列表时,我不断收到错误消息"RecyclerView:未连接适配器;跳过布局" .我有3个标签,一个标签具有从SQLite数据库填充的RecyclerView列表.我没有崩溃,并且数据在视图中正确显示,但是我仍然收到此错误.
I keep getting the error "RecyclerView: No adapter attached; skipping layout" when the RecyclerView list is shown. I have 3 tabs and one tab has a RecyclerView list that is populated from SQLite database. I don't get any crashes and the data is shown correctly in the view but I still get this error.
我认为这只是一个警告,因为数据正确放置到位,但是当我尝试onClick时它不起作用,并且我确定它与该错误有关.
I thought it was just a warning because the data is in place correctly but when I tried onClick it doesn't work and I'm sure it has something to do with this error.
我知道这个问题已经问了很多遍,但是我检查了大多数问题,但没有一个对我有用.
I know this question has been asked a lot before but I checked most of the questions and none has worked for me.
这是我的片段:
public class RecentsFragment extends Fragment {
DatabaseHelper helper;
List<MyPojo> dbList;
RecyclerView mRecyclerView;
private MyGridAdapter mAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.my_recents_list, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));
mRecyclerView.setHasFixedSize(true);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
dbList = new ArrayList<MyPojo>();
dbList = getCat(); // getCat returns array list from sqlite database
mAdapter = new MyGridAdapter(dbList);
mRecyclerView.setAdapter(mAdapter);
}
}
我的适配器:
public class MyGridAdapter extends RecyclerView.Adapter<MyGridAdapter.ViewHolder> {
static List<MyPojo> dbList;
static Context context;
MyGridAdapter(Context context, List<MyPojo> dbList){
this.dbList = new ArrayList<MyPojo>();
this.context = context;
this.dbList = dbList;
}
MyGridAdapter(List<MyPojo> dbList){
this.dbList = new ArrayList<MyPojo>();
this.dbList = dbList;
}
@Override
public MyGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.categories_item, null);
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
@Override
public void onBindViewHolder(final MyGridAdapter.ViewHolder holder, int position) {
holder.title.setText(dbList.get(position).getCat());
}
@Override
public int getItemCount() {
return dbList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView title;
public LinearLayout placeHolder;
ImageView image;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
title = (TextView) itemLayoutView.findViewById(R.id.placeName);
}
@Override
public void onClick(View v) {
Intent intent = new Intent(context, DetailsActivity.class);
Bundle extras = new Bundle();
extras.putInt("catid", dbList.get(getAdapterPosition()).getCatid());
intent.putExtras(extras);
context.startActivity(intent);
}
}
}
预先感谢
更新:my_recents_list.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".RecentsFragment">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f8f8f8"
android:divider="@null"
android:listSelector="@android:color/transparent"/>
</LinearLayout>
推荐答案
为避免此错误,请避免将findViewById放入CreateView方法中,而应将其放入onViewCreated中.
To avoid this error, avoid to do the findViewById into the CreateView method but instead do it into the onViewCreated.
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.my_recents_list, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));
mRecyclerView.setHasFixedSize(true);
setHasOptionsMenu(true);
dbList = new ArrayList<MyPojo>();
dbList = getCat(); // getCat returns array list from sqlite database
mAdapter = new MyGridAdapter(getActivity(), dbList);
mRecyclerView.setAdapter(mAdapter);
}
修改
您的适配器应该像:
public class MyGridAdapter extends RecyclerView.Adapter<MyGridAdapter.ViewHolder> {
private List<MyPojo> dbList;
private Context context;
MyGridAdapter(Context context, List<MyPojo> dbList) {
this.dbList = new ArrayList<MyPojo>(dbList);
this.context = context;
}
@Override
public MyGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Note that the inflate method takes the layout to inflate, the parent to measure
// the layout and the third parameters is false so only this view will handle events like click event
View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.categories_item, parent, false);
return new ViewHolder(itemLayoutView);
}
@Override
public void onBindViewHolder(final MyGridAdapter.ViewHolder holder, final int position) {
MyPojo myPojo = dbList.get(position);
holder.title.setText(myPojo.getCat());
//You can register the click listener to the textview (or the whole item if you put it into the holder)
holder.title.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context, DetailsActivity.class);
Bundle extras = new Bundle();
extras.putInt("catid", dbList.get(position).getCatid());
intent.putExtras(extras);
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return dbList.size();
}
//The class is static to avoid leaks from a non-static nested class
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
title = (TextView) itemLayoutView.findViewById(R.id.placeName);
}
}
}
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