Question

我在Android上创建自定义视图。我需要将它作为列表视图中的项目使用。

我的自定义视图：

public class CustomView extends View{
int random;

//4 constructors;

public int getRandom() {
    return random;
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    setMeasuredDimension(w, h);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawBitmap(b, 0,0,new Paint());
    drawLetters(new Canvas(b));
}

private void init(){
    drawingUtil = DrawingUtil.getInstance(getContext());
    random = new Random().nextInt();
}

}

适配器：

public class ListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    List<String> chapter = new ArrayList<>();
    Context context;
    LayoutInflater inflater;

    public ListAdapter(List<String> chapter, Context context) {
        this.chapter = chapter;
        this.context = context;
        this.inflater = LayoutInflater.from(context);
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = inflater.inflate(R.layout.item, null);
        return new ChapterHolder(v);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ((ChapterHolder) holder).setVerse(chapter.get(position), position);
        Log.d(Constants.LOG_TAG, getClass().getSimpleName() + ": random " + ((ChapterHolder) holder).getRandom());
    }

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

}

问题是重复了自定义视图的内容。测试我在日志中写入自定义视图类中生成的随机数。滚动列表中重复的数字，即使我只向下滚动。我需要做些什么来使每个元素不重复内容？

Answer 1

从它的第一眼看起来，你似乎正在创建一个ViewHolder（ChapterHolder），但你正在绑定另一个（RecyclerView.ViewHolder）。在您的适配器声明中，它应该是：

public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ChapterHolder>

然后你的onBindViewHolder将实际绑定权利持有者......并且看起来像这样：

    public void onBindViewHolder(ChapterHolder holder, int position) {
        holder.setVerse(chapter.get(position), position);
        Log.d(Constants.LOG_TAG, getClass().getSimpleName() + ": random " + 
        holder.getRandom());
    }

RecyclerView里面的CustomView

1 个答案: