Android 在循环视图中的文本可绘制上设置适配器

无法在

RecycleView

上设置文本drwable

public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext())
            .inflate(R.layout.list_row, viewGroup, false);
    ViewHolder viewHolder = new ViewHolder(v);
    return viewHolder;
}

@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
    ExpensesTable nature = expensesItem.get(i);
    viewHolder.category.setText(nature.getCategory());
    viewHolder.money.setText(nature.getMoney());
    viewHolder.date.setText(nature.getDate());
    viewHolder.time.setText(nature.getTime());
    viewHolder.notes.setText(nature.getNotes());
    TextDrawable drawable = mDrawableBuilder.build(String.valueOf(nature.getCategory().charAt(0)), mColorGenerator.getColor(nature.getCategory()));
    viewHolder.imageView.setImageDrawable(drawable);
}

我正在尝试此操作，但无法设置textdrwable的适配器，但适配器上的show me

NullPointerException

---

在哪里初始化您的

TextDrawable

？查看您的66行在哪里？可能您的mDrawableBuilder为null，您需要首先在构造函数中初始化mDrawableBuilder