Question

我在项目中使用DataBindings和RecyclerView。我有RecyclerView的基础适配器。看起来像这样

public abstract class BaseAdapter<T extends ViewDataBinding> extends RecyclerView.Adapter<BaseAdapter.ViewHolder> {

    public BaseAdapter() {}

    public class ViewHolder extends RecyclerView.ViewHolder {

        public T binding;

        public ViewHolder(View view) {
            super(view);
            binding = DataBindingUtil.bind(view);
        }
    }

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

}

ViewHolder扩展类只有绑定字段类型不同。在实现扩展的BaseAdapter类之后：

public class BaseAdapterExtended extends BaseAdapter<BaseAdapterExtendedBinding> {

    public BaseAdapterExtended(ArrayList<ItemModel> itemModels) {
        super();
        mData = itemModels;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        return new ViewHolder(BaseAdapterExtendedBinding.inflate(inflater, parent, false).getRoot());
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        super.onBindViewHolder(holder, position);
    }

    @Override
    protected View getItemRootView(ViewHolder holder) {
        return holder.binding.item;
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }
}

我有下一个编译错误：

error: BaseAdapterExtended is not abstract and does not override abstract method onBindViewHolder(BaseAdapter.ViewHolder,int) in Adapter

似乎BaseAdapterExtended没有这种方法，但他存在。如果我改变

public void onBindViewHolder(ViewHolder holder, int position)

到

public void onBindViewHolder(BaseAdapter.ViewHolder holder, int position)

预测编译正常，但类型绑定将是ViewDataBinding而不是BaseAdapterExtendedBinding。为什么会这样？有什么想法吗？

Answer 1

在我的情况下，我忘记了参数化我的超类。创建类时，我还没有创建ViewHolder，除了该方法的错误外，它非常宽松。即：

public class FooAdapter extends RecyclerView.Adapter {

不得不改为

public class FooAdapter extends RecyclerView.Adapter<FooAdapter.FooViewHolder> {

无论如何都需要这样做，但我得到的唯一编译错误是onBindViewHolder。

Answer 2

在这一行：

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    super.onBindViewHolder(holder, position);
}

将 ViewHolder 替换为 BaseAdapterExtended.ViewHolder

Answer 3

我刚刚找到了这个奇怪问题的原因。这也发生在我的项目中，但仅适用于参数化的适配器，就像你的那样。所有其他适配器都看到了BindViewHolder（）方法，而无需在类中显式指定ViewHolder。解决方案是使用任何随机参数类型对ViewHolder类进行参数化，这看起来像是一个错误。

public abstract class BaseAdapter<T extends ViewDataBinding> extends RecyclerView.Adapter<BaseAdapter.ViewHolder> {

public BaseAdapter() {}

public class ViewHolder<RandomTypeNotUsed> extends RecyclerView.ViewHolder {

    public T binding;

    public ViewHolder(View view) {
        super(view);
        binding = DataBindingUtil.bind(view);
    }
}

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

}

Answer 4

对我来说很好！ //就像是我的imageview

@Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int i) {
        MyViewHolder myViewHolder1 = (MyViewHolder)viewHolder;
        myViewHolder1.like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "yay" + i, Toast.LENGTH_SHORT ).show();
            }
        });
    }

RecyclerView.Adapter没有看到overBided onBindViewHolder

4 个答案: