是否有更好的方法从适配器获取对父RecyclerView的引用? [英] Is there a better way of getting a reference to the parent RecyclerView from the adapter?

问题描述

我有一个用例，我需要从适配器内部(特别是在onBindViewHolder方法内部)对父级RecyclerView的引用.到目前为止，我正在做的就是将它分配给onCreateViewHolder方法中的私有类成员，并通过viewGroup parent arg传递，就像这样:

I have a use case where I need a reference to the parent RecyclerView from inside the adapter, specifically inside the onBindViewHolder method. So far what I am doing is assigning it to a private class member in the onCreateViewHolder method passing along the viewGroup parent arg like so:

private ViewGroup mParent;

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    // inflater logic.
    mParent = parent;
}

并像这样在onBindViewHolder中引用父级RecyclerView:

And referencing the parent RecyclerView in onBindViewHolder like this:

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    // binder logic.
    ((RecyclerView)mParent).blahBlahBlah();
}

是否有更好的方法?也许RecyclerView.Adapter有一种我可能想念的方式?

Is there a better way of doing this? Maybe RecyclerView.Adapter has a way that I may have missed?

推荐答案

实际上有一个特定的方法，该方法使用附加到适配器的RecyclerView进行回调.只需覆盖onAttachedToRecylerView(RecyclerView recyclerView)方法.

There's actually a specific method that callsback with the RecyclerView that attaches to the adapter. Just override the onAttachedToRecylerView(RecyclerView recyclerView) method.

public class Adapter_RV extends RecyclerView.Adapter<RecyclerView.ViewHolder>{

    RecyclerView mRecyclerView; 


    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);

        mRecyclerView = recyclerView;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        mRecyclerView....
    }

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