Question

我正在我的应用程序中执行位图调整大小。我有一个名为Bitmap Images的文件夹，它具有启动位图调整大小的功能。但是在我的适配器（这行代码）hold.Img.SetImageBitmap(BitmapImages.decodeSampledBitmapFromResource(getResources(),news[position].Image,100,100));中，第一个参数getResource被引发为错误。缺少什么？

public class MyAdapter : RecyclerView.Adapter

    {
        private JavaList<News> news;



        public MyAdapter(JavaList<News> news)
        {
            this.news = news;

        }

        //binding data to views
        public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
        {
            MyHolder hold = holder as MyHolder;
            hold.Comment.Text = news[position].Comment;
            //hold.Img.SetImageResource(news[position].Image);
            hold.Img.SetImageBitmap(BitmapImages.decodeSampledBitmapFromResource(getResources(),news[position].Image,100,100));


        }

Answer 1

问题是你没有通过Context。要访问getResources()，您必须通过Context。所以修改你的适配器类。

public class MyAdapter : RecyclerView.Adapter

{
    private JavaList<News> news;
    private Context context;



    public MyAdapter(JavaList<News> news, Context context)
    {
        this.news = news;
        this.context = context;
    }

   ......
 //Then in your OnBindViewHolder you can call getResources
  .....
   hold.Img.SetImageBitmap(BitmapImages.decodeSampledBitmapFromResource(context.getResources(),news[position].Image,100,100));
 }

加载BitMap图像 - Xamarin.Andoird

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