RecyclerView Adapter OnClick参数 [英] RecyclerView Adapter OnClick parameter

问题描述

我有一个RecyclerView适配器，该适配器需要在每个项目内的多个视图上实现OnClick侦听器.但是，OnClick侦听器需要在侦听器外部更改变量，但这是一个问题，因为它只能在OnClick侦听器内部使用最终变量.这是我实现OnClick侦听器的代码:

I have a RecyclerView Adapter which needs to implement OnClick listeners on several of the views inside each item. However, the OnClick listener needs to change a variable outside of the listener, but this is a problem since it can only use final variables inside the OnClick listener. Here is my code where I implements the OnClick listener:

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

    final boolean liked = false;
    holder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // here I can only reference a final variable, but I need to change it
            if (!liked){
                liked = true;
            }
        }
    });
}

我还尝试在ViewHolder类中将变量创建为类变量，并将其用作holder.liked，但仍需要是最终变量.我该如何解决这个问题?

I also tried to create the variable as a class variable in the ViewHolder class and use it as holder.liked, but still it needs to be final. How can i get aroud this issue?

推荐答案

请尝试在扩展的观看器上实现onClickListener:

Try implementing onClickListener on an extended viewholder instead:

 private class LikeHolder extends RecyclerView.ViewHolder
    implements View.OnClickListener {

    private boolean mLiked = false;

    public LikeHolder(LayoutInflater inflater, ViewGroup parent) {
        super(inflater.inflate(R.layout.your_holder_layout, parent, false));

        itemView.setOnClickListener(this);
        ...
    }


    @Override
    public void onClick(View view) {
     if (!mLiked){
            mLiked = true;
    }
}

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