Question

我正在尝试将图片从网站加载到图库中。图像无法加载到图库中。第一个（主）图像确实加载。

    public class viewimages extends Activity {

private Gallery gallery;
private ImageView imgView;

private Integer[] Imgid = {
        R.drawable.a_1, R.drawable.a_2, R.drawable.a_3, R.drawable.a_4
};

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.viewimages);
    try {
    URL url = new URL("http://www.mysite.com/images/1000298/pics/1.jpg");

        Bitmap bmp = BitmapFactory.decodeStream(url.openConnection()
                            .getInputStream());
        imgView = (ImageView)findViewById(R.id.ImageView01);    
        imgView.setImageBitmap(bmp);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }



     gallery = (Gallery) findViewById(R.id.examplegallery);
     gallery.setAdapter(new AddImgAdp(this));

     gallery.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position, long id) {
            imgView.setImageResource(Imgid[position]); 
        }
    });


}

public class AddImgAdp extends BaseAdapter {
    int GalItemBg;
    private Context cont;

    public AddImgAdp(Context c) {
        cont = c;

        TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
        GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
        typArray.recycle();
    }

    public int getCount() {
        return Imgid.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imgView = new ImageView(cont);
        List<String> imageNames = new ArrayList<String>();
        imageNames.add("1.jpg");
        imageNames.add("2.jpg");
        //etc. until you've added all images

        for (int i = 0; i < imageNames.size(); i++){
            URL url;
            try {
                url = new URL("http://www.mysite.com/images/1000298/pics/" + imageNames.get(i));
                Bitmap bmp = BitmapFactory.decodeStream(url.openConnection()
                        .getInputStream());
                imgView.setImageBitmap(bmp);
                imgView.setLayoutParams(new Gallery.LayoutParams(80, 70));
                imgView.setScaleType(ImageView.ScaleType.FIT_XY);
                imgView.setBackgroundResource(GalItemBg);
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }



        return imgView;
    }
}

    }

问题似乎出现在AddImgAdp类的getView（）中。我不确定这是否是尝试从网站加载图像的正确位置？

Answer 1

您需要先加载所有图像。基本上你正在做的是当适配器加载时，你然后循环，尝试加载所有图像。创建一个下载图像的异步任务（我建议只将它们加载到另一个arraylist中，直到你对缓存这样的事情更加熟悉）。然后，在设置适配器时，抓住位置以使用您要查找的图像。例如，

"imgView.setImageBitmap(imageArray.get(position))";

Answer 2

今天已经存在很多android图片加载库，试着用它们来简化开发。例如https://github.com/gobozov/Android-Universal-Image-Loader

将图像从URL加载到图库中

2 个答案: