Xamarin的Andr​​oid - 位图资源，以int数组的ViewPager [英] Xamarin Android - Bitmap Drawables to Int array for ViewPager

问题描述

我该设备作为COM pressed位图上本地存储一些照片。为了获取他们，我让他们从他们的文件路径，德code它们，然后将它们存储为BitmapDrawables。

I am storing some images locally on the device as compressed bitmaps. To retrieve them i get them from their file path, decode them, and then store them as BitmapDrawables.

我现在需要使用这些bitmapDrawables来填充viewPager。

I now need to use these bitmapDrawables to populate a viewPager.

这是code，有效地得到我所有的位图转换为位图数组：

This is the code that effectively gets all my bitmaps into a bitmap array:

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 (); 
    }

和我Console.WriteLine的可结果是：

And the result of my console.writeline is:

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到我viewPager适配器类。至于我知道我需要将它们转换到我的适配器类将用于填充viewPager绘制对象的int数组。所以我需要的东西，看起来像这样：

So I now need to somehow pass them into my viewPager adapter class. As far as i'm aware i need to convert them to an int array of drawable objects which my adapter class will use to populate the viewPager. So i need something that looks like this:

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

任何人可以帮助的流量将这些转换成int数组我需要，还是建议我怎么可以使用drawble对象我必须这样做，让我有什么适合我的ViewPager适配器吗？这是我第一次用viewPager，它已经比我想象的麻烦。

Can anybody help on ow to convert these into the int array i need, or suggest how i can do it using the drawble objects i have, so that i have something suitable for my ViewPager adapter please? It's the first time i've used viewPager and it's been trickier than i imagined.

推荐答案

我在一个位图数组传递到适配器最终解决它。像这样的：

I solved it by passing in a Bitmap array to the adapter in the end. Like this:

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;
        }
    }

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