如何创建RecyclerView多个视图类型？ [英] How to create RecyclerView with multiple view type?

问题描述

从<一个href="https://developer.android.com/$p$pview/material/ui-widgets.html">https://developer.android.com/$p$pview/material/ui-widgets.html

当我们创建 RecyclerView.Adapter 我们必须指定 ViewHolder 将与该适配器绑定。

When we creating RecyclerView.Adapter we have to specify ViewHolder that will bind with that adapter.

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

    private String[] mDataset;

    public MyAdapter(String[] myDataset) {
        mDataset = myDataset;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;
        public ViewHolder(TextView v) {
            super(v);
            mTextView = v;
        }
    }

    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.some_layout, parent, false);

        //findViewById...

        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.mTextView.setText(mDataset[position]);
    }

    @Override
    public int getItemCount() {
        return mDataset.length;
    }
}

那么，是不是可以创建 RecyclerView 与多个视图类型？

推荐答案

是的，这是可能的。刚刚实施<一个href="https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html#getItemViewType(int)">getItemViewType(),和照顾 viewType 参数的 onCreateViewHolder（）。

Yes, it's possible. Just implement getItemViewType(), and take care of the viewType parameter in onCreateViewHolder().

所以，你做这样的事情：

So you do something like:

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    class ViewHolder0 extends RecyclerView.ViewHolder {
        ...
    }

    class ViewHolder2 extends RecyclerView.ViewHolder {
        ...
    }

    @Override
    public int getItemViewType(int position) {
        // Just as an example, return 0 or 2 depending on position
        // Note that unlike in ListView adapters, types don't have to be contiguous
        return position % 2 * 2;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         switch (viewType) {
             case 0: return new ViewHolder0(...);
             case 2: return new ViewHolder2(...);
             ...
         }
    }
}

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