[英]Cannot resolve method of android.support.v4.app.FragmentActivity in ViewModelProviders
[英]Cannot resolve constructor 'GridLayoutManager(android.support.v4.app.FragmentActivity)
當我將LinearLayoutManagar更改為GridLayoutManager時,我遇到了這個問題。 我希望列表位於網格視圖而不是列表視圖中。 錯誤來自getActivity()
錯誤:
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)
這是我的代碼。
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;
}
}
我的適配器
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) {
}
}
}
書簽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>
網格項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>
用下面的代碼替換您的代碼。 您的代碼失敗,因為Constructor需要兩個參數,即Context
> Activity上下文和int
- No columns 。
recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), numberOfColumns));
GridLayoutManager需要多個參數,請嘗試使用其構造函數之一:
int num_columns = 2;
new GridLayoutManager(getActivity(), num_columns);
更改代碼的這一行:
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
至
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(),numberOfYourColumns);
recyclerView.setLayoutManager(layoutManager);
這樣嘗試
// 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);
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”`
從活動中刪除setLlayoutManager
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.