在使用Universal Image Loader加载图片时显示不确定进度条

Question

在使用Universal Image Loader加载图片时显示不确定进度条

universal-image-loader

18

我想知道在使用Universal Image Loader加载图片时，是否有一种机制可以显示旋转的“不定期进度条”代替正在加载的图像。

目前，我正在使用DisplayImageOptions中的showStubImage()选项，以显示一个说“无图像”的图像，而图像正在下载时，但如果在ImageView上有一个旋转的不定期进度条，在图像下载时将会显得非常漂亮。

- DiscDev

2个回答

1

我正在发布网格适配器类的代码，该代码用于从网络下载图像。您需要声明一个带有一个imageview和两个textviews的网格布局。将字符串数组传递给适配器。

@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
    // TODO Auto-generated method stub
    LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(activity.LAYOUT_INFLATER_SERVICE);
    //LayoutInflater inflator = activity.getLayoutInflater();
    if(convertView==null)
    {
        view = new ViewHolder();
        convertView = inflater.inflate(R.layout.grid_layout, null);
        view.txtViewTitle = (TextView) convertView.findViewById(R.id.title);
        view.txtViewSubTitle = (TextView) convertView.findViewById(R.id.subTitle);
        view.imgViewFlag = (ImageView) convertView.findViewById(R.id.imageView1);
        convertView.setTag(view);
    }
    else
    {
        view = (ViewHolder) convertView.getTag();
    }

    view.txtViewTitle.setText(listTitle.get(position));
    view.txtViewSubTitle.setText(listSubTitle.get(position));

    //For Picasso
 /*   Picasso.with(parent.getContext())
            .load("http://www.radioarpan.com/upload_images/138630281911.jpg")
            .placeholder(R.mipmap.paceholder)
            .error(R.mipmap.error_page_logo)
            .noFade().resize(125,165)
            .centerCrop()
            .into(view.imgViewFlag);*/



    ImageLoader imageLoader = ImageLoader.getInstance();
    DisplayImageOptions.Builder options = new DisplayImageOptions.Builder().cacheInMemory(true)
            .cacheOnDisc(true).resetViewBeforeLoading(true)
            .showImageForEmptyUri(R.mipmap.paceholder)
            .showImageOnFail(R.mipmap.error_page_logo);


    final ProgressBar spinner =  new ProgressBar(activity, null, android.R.attr.progressBarStyleSmall);
//download and display image from url
      imageLoader.displayImage("http://www.radioarpan.com/upload_images/138630281911.jpg", view.imgViewFlag,new SimpleImageLoadingListener()
   {
       @Override
       public void onLoadingStarted(String imageUri, View view)
       {
           spinner.setVisibility(View.VISIBLE);
       }

       @Override
       public void onLoadingFailed(String imageUri, View view, FailReason failReason)
       {
           spinner.setVisibility(View.GONE);
       }

       @Override
       public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage)
       {
           spinner.setVisibility(View.GONE);
       }
   });

- Meghana Patil

我不知道如何恰当地放置代码。非常抱歉上次发布的格式。 - Meghana Patil

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原文链接

- nostra13 · Accepted Answer

供参考

final View imageLayout = inflater.inflate(R.layout.item_pager_image, null);
final ImageView imageView = ...
final ProgressBar spinner = ...

imageLoader.displayImage(images[position], imageView, options, new SimpleImageLoadingListener() {
    @Override
    public void onLoadingStarted(String imageUri, View view) {
        spinner.setVisibility(View.VISIBLE);
    }

    @Override
    public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
        spinner.setVisibility(View.GONE);
    }

    @Override
    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
        spinner.setVisibility(View.GONE);
    }
});