我有一个RecycerView（父），它在一个片段中填充了一些RecycerViews（子），我想用一个动作（例如单击动作）直接从片段中更新每个嵌套的RecycerViews（子），我怎样才能以一种完美而高效的方式做到这一点呢？
初始父适配器
ParentAdapter adapter = new ParentAdapter(dataSet);
mBinding.recyclerView.setAdapter(adapter);
parentAdapter.java
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {
private final RecyclerView.RecycledViewPool viewPool;
private List<CartItemCategory> dataSet;
public MainAdapter(List<CartItemCategory> dataSet) {
this.dataSet = dataSet;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
ShoppingCardParentItemLayoutBinding mBinding = ShoppingCardParentItemLayoutBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false);
return new ViewHolder(mBinding);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
holder.mBinding.setCartItemCategory(dataSet.get(position));
ChildAdapter childAdapter = new ChildAdapter(dataSet.get(position).getCartItems());
holder.mBinding.recyclerView.setHasFixedSize(true);
holder.mBinding.recyclerView.setAdapter(childAdapter);
holder.mBinding.recyclerView.setRecycledViewPool(viewPool);
}
@Override
public int getItemCount() {
return dataSet.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
ShoppingCardParentItemLayoutBinding mBinding;
ViewHolder(@NonNull ShoppingCardParentItemLayoutBinding mBinding) {
super(mBinding.getRoot());
this.mBinding = mBinding;
}
}
}
ChildAdapter.java
public class ChildAdapter extends RecyclerView.Adapter<InnerAdapter.ViewHolder> {
private List<CartItem> cartItems;
public ChildAdapter(List<CartItem> cartItems) {
this.cartItems = cartItems;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
ShoppingCardItemLayoutBinding mBinding = ShoppingCardItemLayoutBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false);
return new ViewHolder(mBinding);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
holder.mBinding.setCartItem(cartItems.get(position));
}
@Override
public int getItemCount() {
return cartItems.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
ShoppingCardItemLayoutBinding mBinding;
ViewHolder(@NonNull ShoppingCardItemLayoutBinding mBinding) {
super(mBinding.getRoot());
this.mBinding = mBinding;
}
}
}
父回收器视图
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
>
子项布局
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
在您的子适配器中，您可以创建一些insert，update，delete等方法，如下所示:
public class ChildAdapter extends RecyclerView.Adapter<InnerAdapter.ViewHolder> {
// ...
public void update(int position, CartItem newCartItem) {
cartItems.set(position, newCartItem);
notifyDataSetChanged(); // <--- THIS IS THE MAIN THING
}
public void add(CartItem newCartItem) {
cartItems.add(newCartItem);
notifyDataSetChanged(); // <--- THIS IS THE MAIN THING
}
public void delete(int position) {
cartItems.remove(position);
}
// ...
}
之后，您可以对按钮单击事件调用这些方法，如下所示:
Button btn = findViewById(R.id.btn);
btn.setOnClickListener( v -> {
CartItem cartItem = new CartItem(); // <-- initialize properly
childAdapter.add(newCartItem);
// OR to update
// childAdapter.update(position, newCartItem); // <-- the position where you want to update
// OR to delete
// childAdapter.delete(position); // <-- item at position that you want to delete
});
我想你可以这样做。
