Android 错误:类FirebaseRecyclerAdapter中的构造函数FirebaseRecyclerAdapter<;T、 VH>;无法应用于给定类型
我有使用Firebase的recyclerview的以下代码。回收器视图使用以下适配器Android 错误:类FirebaseRecyclerAdapter中的构造函数FirebaseRecyclerAdapter<;T、 VH>;无法应用于给定类型,android,firebase,firebase-realtime-database,android-recyclerview,firebaseui,Android,Firebase,Firebase Realtime Database,Android Recyclerview,Firebaseui,我有使用Firebase的recyclerview的以下代码。回收器视图使用以下适配器 FirebaseRecyclerAdapter<DownloadList,DownloadListFragment.DownloadViewHolder> recyclerAdapter= new FirebaseRecyclerAdapter<DownloadList, DownloadViewHolder>( DownloadList.class,
FirebaseRecyclerAdapter<DownloadList,DownloadListFragment.DownloadViewHolder> recyclerAdapter= new FirebaseRecyclerAdapter<DownloadList, DownloadViewHolder>(
DownloadList.class,
R.layout.download_cardview,
DownloadViewHolder.class,
databaseReference
) {
@Override
protected void populateViewHolder(DownloadViewHolder viewHolder, DownloadList model, int position) {
viewHolder.setTitle(model.gettitle());
//viewHolder.setImage(model.getimage());
viewHolder.setDate(model.getDate());
}
@Override
public DownloadViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
DownloadViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);
viewHolder.setOnClickListener(new DownloadViewHolder.ClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(getActivity(), "Item click at " + arrayAdapter.getItem(position), Toast.LENGTH_SHORT).show();
DownloadImageFragment fragment = new DownloadImageFragment();
Bundle arguments = new Bundle();
arguments.putString( "Batch" , batchID);
arguments.putString( "Type" , typeID);
arguments.putString( "Url", arrayAdapter.getItem(position));
arguments.putString( "Title", (String) titleAdapter.getItem(position));
fragment.setArguments(arguments);
final FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.content, fragment , "Download List");
ft.commit();
}
@Override
public void onItemLongClick(View view, int position) {
return ;
}
});
return viewHolder;
}
};
recyclerView.setAdapter(recyclerAdapter);
return view;
}
public static class DownloadViewHolder extends RecyclerView.ViewHolder {
View mView;
TextView textView_Title;
TextView textView_Date;
TextView textView_Image;
String simage,stitle;
private static Context context;
public DownloadViewHolder(View itemView) {
super(itemView);
mView = itemView;
context = itemView.getContext();
textView_Title = (TextView) itemView.findViewById(R.id.textView_download_title);
textView_Image = (TextView) itemView.findViewById(R.id.textView_image_download);
textView_Date = (TextView) itemView.findViewById(R.id.textView_download_date);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mClickListener.onItemClick(v, getAdapterPosition());
}
});
itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
mClickListener.onItemLongClick(v, getAdapterPosition());
return true;
}
});
}
现在在构建apk时,会弹出以下错误
错误:类中的构造函数FirebaseRecyclerAdapter
FirebaseRecyclerAdapter无法应用于给定类型;
必需:找到FirebaseRecyclerOptions:
类,int,类,数据库引用
原因:实际参数列表和形式参数列表的长度不同,其中T,VH
类型变量:T扩展类中声明的对象
FirebaseRecyclerAdapter VH扩展类中声明的ViewHolder
火基回收适配器
在android studio的3.1更新(2018年3月)之前,这是不存在的
我尝试过更改app:compatv7版本,但仍然不起作用
也根据提供的文件,它说要使用
Query query = FirebaseDatabase.getInstance()
.getReference()
.child("chats")
.limitToLast(50);
及
FirebaseRecyclerOptions选项=
新的FirebaseRecyclerOptions.Builder()
.setQuery(查询,Chat.class)
.build();
现在我的问题是,因为我已经在应用程序的15个不同位置使用了上述recyclerView,所以我需要在所有15个位置更改它吗?还是有其他方法?另外,如果我使用query,新代码是否可以兼容
您可以实现自己的
FirebaseRecyclerAdapter
子类,将旧签名映射到新签名。比如:
class MyFirebaseRecyclerAdapter<T, VH extends RecyclerView.ViewHolder> :FirebaseRecyclerAdapter<T, VH> {
public MyFirebaseRecyclerAdapter(Class pojoClass<T>, int layout, Class<VH> viewHolderClass, Query query) {
super(new FirebaseRecyclerOptions.Builder<T>()
.setQuery(query, pojoClass.class)
.build());
...
类MyFirebaseRecyclerAdapter:FirebaseRecyclerAdapter{
公共MyFirebaseRecyclerAdapter(类pojoClass、int layout、类viewHolderClass、查询){
super(新的FirebaseRecyclerOptions.Builder()
.setQuery(查询,pojoClass.class)
.build());
...
然后,您仍然需要更新所有位置以使用新的MyFirebaseRecyclerAdapter
,但至少在此之后签名将兼容
FirebaseRecyclerOptions<Chat> options =
new FirebaseRecyclerOptions.Builder<Chat>()
.setQuery(query, Chat.class)
.build();
class MyFirebaseRecyclerAdapter<T, VH extends RecyclerView.ViewHolder> :FirebaseRecyclerAdapter<T, VH> {
public MyFirebaseRecyclerAdapter(Class pojoClass<T>, int layout, Class<VH> viewHolderClass, Query query) {
super(new FirebaseRecyclerOptions.Builder<T>()
.setQuery(query, pojoClass.class)
.build());
...