有没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引用父 RecyclerView，特别是在 onBindViewHolder 方法内部.到目前为止，我正在做的是将它分配给 onCreateViewHolder 方法中的私有类成员，沿着 viewGroup parent arg 传递，如下所示:

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 RecyclerView:

And referencing the parent RecyclerView in onBindViewHolder like this:

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

有没有更好的方法来做到这一点?也许 RecyclerView.Adapter 有一种我可能错过的方法?

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可以通过附加到适配器的 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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