[英]Cannot resolve constructor 'GridLayoutManager(android.support.v4.app.FragmentActivity)
I am facing this problem when I change the LinearLayoutManagar to GridLayoutManager. 当我将LinearLayoutManagar更改为GridLayoutManager时,我遇到了这个问题。 I want the list to be in the grid view not list view.
我希望列表位于网格视图而不是列表视图中。 The error comes in the getActivity()
错误来自getActivity()
error: 错误:
no suitable constructor found for GridLayoutManager(FragmentActivity)
constructor GridLayoutManager.GridLayoutManager(Context,AttributeSet,int,int) is not applicable
(actual and formal argument lists differ in length)
constructor GridLayoutManager.GridLayoutManager(Context,int) is not applicable
(actual and formal argument lists differ in length)
constructor GridLayoutManager.GridLayoutManager(Context,int,int,boolean) is not applicable
(actual and formal argument lists differ in length)
This is my code. 这是我的代码。
public class FragmentBookmark extends Fragment {
View paramView;
MyAdapter adapter;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
paramView = inflater.inflate(R.layout.bookmark, container, false);
RecyclerView recyclerView = (RecyclerView) paramView.findViewById(R.id.listRecyclerView);
MyAdapter adapter = new MyAdapter();
recyclerView.setAdapter(adapter);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
return paramView;
}
}
My Adapter 我的适配器
public class MyAdapter extends RecyclerView.Adapter {
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.grid_item, viewGroup, false);
return new ListViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
((ListViewHolder) viewHolder).bindView(i);
}
@Override
public int getItemCount() {
return OurData.title.length;
}
private class ListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView mItemText;
private ImageView mItemImage;
public ListViewHolder(View itemView) {
super(itemView);
mItemText = (TextView) itemView.findViewById(R.id.tv_name);
mItemImage = (ImageView) itemView.findViewById(R.id.imageview);
itemView.setOnClickListener(this);
}
public void bindView(int position) {
mItemText.setText(OurData.title[position]);
mItemImage.setImageResource(OurData.picture[position]);
}
@Override
public void onClick(View v) {
}
}
}
bookmark xml 书签xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:id="@+id/listRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
grid item xml 网格项xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardElevation="4dp"
android:id="@+id/recyclerView">
<ImageView
android:id="@+id/imageview"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="5dp"
android:contentDescription="@null" />
<TextView
android:id="@+id/tv_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:maxLines="1"
android:text="newText"
android:singleLine="true" />
</LinearLayout>
Replace your code with below code. 用下面的代码替换您的代码。 Your code is failing because Constructor expects two params,
Context
-> Activity context and int
- No of columns . 您的代码失败,因为Constructor需要两个参数,即
Context
> Activity上下文和int
- No columns 。
recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), numberOfColumns));
GridLayoutManager expects more than one argument, try one of its constructors: GridLayoutManager需要多个参数,请尝试使用其构造函数之一:
int num_columns = 2;
new GridLayoutManager(getActivity(), num_columns);
change this line of your code : 更改代码的这一行:
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
to 至
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(),numberOfYourColumns);
recyclerView.setLayoutManager(layoutManager);
try like this 这样尝试
// Initializing recyclerview
RecyclerView recyclerViewItems = findViewById(R.id.rv_feeds);
//setting no of cols. orientation using GridLayoutManager
GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 2, LinearLayout.VERTICAL, false);
recyclerViewItems.setLayoutManager(gridLayoutManager);
//passing data to adapter
FeedsRecycleViewAdapter adapter = new FeedsRecycleViewAdapter(this, myImageList, myBrands, myPrice, myActPrice);
Add layout manager in bookmark.xml file 在bookmark.xml文件中添加布局管理器
xmlns:app="http://
schemas.android.com/apk/res-auto" app:layoutManager="android.support.v7.widget.GridLayoutManager" app:spanCount="2"` xmlns:app="http://
schemas.android.com/apk/res-auto” app:layoutManager =“ android.support.v7.widget.GridLayoutManager” app:spanCount =“ 2”`
Remove setLlayoutManager from activity 从活动中删除setLlayoutManager
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