Question

我有gridview，必须将图像下载到gridview。当我打开应用程序时，我看不到任何图像，但我认为我的代码在某种程度上是正确的。怎么解决？我在我的适配器中使用此代码：

// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if (convertView == null) {  // if it's not recycled, initialize some attributes
        //float wd = 250 / Resources.getSystem().getDisplayMetrics().density;
        //float hg = 300 / Resources.getSystem().getDisplayMetrics().density;
        int pxwd = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 90, Resources.getSystem().getDisplayMetrics());
        int pxhg = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 120, Resources.getSystem().getDisplayMetrics());
        imageView = new ImageView(context);
        imageView.setLayoutParams(new GridView.LayoutParams(pxwd, pxhg));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8, 8, 8, 8);
    } else {
        imageView = (ImageView) convertView;
    }
    imageView.setImageDrawable(LoadImageFromURL(GridViewConfig.getImage_list().get(position)));
    return imageView;
}


// references to our images
private Drawable LoadImageFromURL(String url)
{
    try {
        InputStream is = (InputStream) new URL(url).getContent();
        return Drawable.createFromStream(is, "src");
    } catch (Exception e) {
        return null;
    }
}

这里是网址列表：

public class GridViewConfig {
public static ArrayList<String> image_listGrid = new ArrayList<String>();

public static ArrayList<String> getImage_list() {
    return image_listGrid;
}

public static void setImage_list(ArrayList<String> image_list) {
    GridViewConfig.image_listGrid = image_list;
}

public static void addImageUrls(){
    image_listGrid.add("someimage.jpg");
}

但问题是我的GridView上没有显示图像。

Answer 1

在getView(...)中，您应该使用TypedValue.COMPLEX_UNIT_DIP替换TypedValue.COMPLEX_UNIT_SP：

int pxwd = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 90, Resources.getSystem().getDisplayMetrics());
int pxhg = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 120, Resources.getSystem().getDisplayMetrics());

希望这有帮助！

GridView图像未加载

1 个答案: