Question

我将一些图像本地存储在设备上作为压缩位图。要检索它们，我从文件路径中获取它们，解码它们，然后将它们存储为BitmapDrawables。

我现在需要使用这些bitmapDrawable来填充viewPager。

这是将我的所有位图有效地转换为位图数组的代码：

public void getMySeenExhibits()
    {
        string[] myImages;
        myImages = DBconnection.getAllImageURLs (conn); // sqLite connection - this gets all the file paths from SqLite

        List<Drawable> myBitmapList = new List<Drawable>();

        foreach (var imagePath in myImages) 
        {
            Drawable myBitmap = getImageFromLocalStorage (imagePath); // this converts them to BitmapDrawables
            Console.WriteLine ("My Bitmap is " + myBitmap.ToString ()); // just to check what we get back
            myBitmapList.Add (myBitmap); 

        }

        myBitmapList.ToArray (); 
    }

我的console.writeline的结果是：

My Bitmap is android.graphics.drawable.BitmapDrawable@425df378

所以我现在需要以某种方式将它们传递给我的viewPager适配器类。据我所知，我需要将它们转换为可绘制对象的int数组，我的适配器类将使用它来填充viewPager。所以我需要看起来像这样的东西：

private int[] imageArray = { Resource.drawable.a, Resource.drawable.b, Resource.drawable.c}

任何人都可以帮助将这些转换为我需要的int数组，或者建议我如何使用我拥有的drawble对象来做到这一点，以便我有适合我的ViewPager适配器的东西吗？这是我第一次使用viewPager，它比我想象的更棘手。

Answer 1

我通过将Bitmap数组最后传递给适配器来解决它。像这样：

public class ViewFragmentAdapter: FragmentPagerAdapter
    {
        Bitmap[] imageArray;


        public ViewFragmentAdapter (Android.Support.V4.App.FragmentManager fm, Bitmap[] imageArray) 
            : base (fm)
        {
            this.imageArray = imageArray;
        }

        public override int Count {
            get { return imageArray.Length; }

        }



        public override Android.Support.V4.App.Fragment GetItem (int position)
        {
            return new viewerFragment(imageArray[position]);
        }
    }


    public class viewerFragment: Android.Support.V4.App.Fragment
    {
        Bitmap bm;

        public viewerFragment(Bitmap bitmap)
        {
            bm = bitmap;
        }

        public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var view = inflater.Inflate (Resource.Layout.myExhibitHistoryItem, container, false);

            var image = view.FindViewById<ImageView> (Resource.Id.exhibitImage);

            image.SetImageBitmap (bm);

            return view;
        }
    }

Xamarin Android - 用于ViewPager的Int数组的Bitmap Drawables

1 个答案: