Question

我试图使用RecyclerView来显示我的数据集，试图关注这个网站 https://developer.android.com/training/material/lists-cards.html

问题是有一些部分是错误的，无法找到解决方法，我确切地知道该网站的建议。

var light = new THREE.SpotLight(0xFFFFFF);
light.position.set(0,130,0);
light.target.position.set(200,-130,400);
scene.add(light);

Android Studio给我一个错误：

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;
    }
}

我该怎么做？

似乎 developer.android.com 在这里有一些错字？

Answer 1

你试过这个吗？

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

Answer 2

当您为视图充气时，通常最好创建一个您正在膨胀的特定视图类型的实例。在这种情况下，您正在膨胀TextView。由于View从View延伸，编译器不会抱怨它，但当您尝试将TextView用作// create a new view TextView v = (TextView) LayoutInflater.from(parent.getContext()) .inflate(R.layout.my_text_view, parent, false);时，您的应用会崩溃。

View

将TextView更改为sudo avrdude -c usbtiny -p m16 -U lfuse:w:0xEE:m。

Answer 3

ViewHolder中的构造函数包含TextView。因此，您无法将View发送给ViewHolder。尝试将视图缓存到TextView，如下所示。

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

如何使用RecyclerView，尝试遵循developer.android.com建议，但得到错误

3 个答案: