如何使用RecyclerView，嘗試遵循developer.android.com建議，但得到錯誤

Question

我正在嘗試使用RecyclerView來顯示我的數據集，嘗試關注此網站https://developer.android.com/training/material/lists-cards.html

問題是有一些部分是錯誤的，無法找到如何解決它，我確切地說該網站的建議。

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private String[] mDataset;

    // Provide a reference to the views for each data item
    // Complex data items may need more than one view per item, and
    // you provide access to all the views for a data item in a view holder
    public static class ViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case
        public TextView mTextView;
        public ViewHolder(TextView v) {
            super(v);
            mTextView = v;
        }
    }

    // Provide a suitable constructor (depends on the kind of dataset)
    public MyAdapter(String[] myDataset) {
        mDataset = myDataset;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                               int viewType) {
        // create a new view
        View v = LayoutInflater.from(parent.getContext())
                           .inflate(R.layout.my_text_view, parent, false);
        // set the view's size, margins, paddings and layout parameters
        ...
        ViewHolder vh = new ViewHolder(v);     // ERROR
        return vh;
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // - get element from your dataset at this position
        // - replace the contents of the view with that element
        holder.mTextView.setText(mDataset[position]);

    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return mDataset.length;
    }
}

Android Studio給出了一個錯誤：

ViewHolder (android.widget.TextView) in ViewHolder cannot be applied
to         (android.view.View)

我該怎么做？

看來developer.android.com在這里有一些錯字？

Answer 1

你試過這個嗎？

ViewHolder vh = new ViewHolder((TextView) v);

Answer 2

當您為視圖充氣時，通常最好創建一個您正在膨脹的特定視圖類型的實例。 在這種情況下，您正在膨脹TextView 。 由於TextView從View擴展，編譯器不會抱怨它，但是當您嘗試將View用作TextView您的應用程序將崩潰。

// create a new view
TextView v = (TextView) LayoutInflater.from(parent.getContext())
                       .inflate(R.layout.my_text_view, parent, false);

將View更改為TextView 。

Answer 3

ViewHolder中的構造函數包含TextView。 因此，您無法將View發送給ViewHolder。 嘗試將視圖緩存到TextView，就像這樣。

ViewHolder vh = new ViewHolder((TextView)v);