使用 volley 下载时在自定义适配器中显示进度条

Question

我想在下载时在我的自定义适配器中显示一个进度条！

有我的适配器类

public class ImageAdapter extends BaseAdapter {

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = ((Activity) context).getLayoutInflater().inflate(layoutResourceId, parent, false);
            holder.pictureView = (GalerieImageView) convertView.findViewById(R.id.GalerieView);
            holder.progressBar = (ProgressBar) convertView.findViewById(R.id.progressBarGalerie);
            holder.progressBar.setVisibility(View.VISIBLE);
            holder.progressBar.setIndeterminate(true);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }


        ImageLoader imageLoader = ImageCacheManager.getInstance().getImageLoader();
        if (arrayList.get(position).getTurl() != null) {
            Log.i("lien", "" + arrayList.get(position).getTurl());
            holder.pictureView.setImageUrl(arrayList.get(position).getTurl(), imageLoader);
            holder.pictureView.setVisibility(View.VISIBLE);

            holder.pictureView.setDefaultImageResId(R.drawable.ico_loading);
            holder.pictureView.setErrorImageResId(R.drawable.ico_error);
            holder.pictureView.setLayoutParams(new RelativeLayout.LayoutParams(imageWidth, imageWidth));
            holder.pictureView
                    .setResponseObserver(new GalerieImageView.ResponseObserver() {
                        @Override
                        public void onError() {
                            holder.progressBar.setVisibility(View.GONE);
                        }

                        @Override
                        public void onSuccess() {
                            holder.progressBar.setVisibility(View.GONE);

                        }
                    });
        } else {
            //holder.pictureView.setVisibility(View.GONE);
        }
        return convertView;
    }
}

My Custom Networkview with Observer (GaleryImageView) 它基于this StackOverFlow answer。我无法显示进度条。

Answer 1

我正是这样做的。我将进度条包装在调用 Activity/Fragment 的方法中，而不是适配器本身。比如：

public void startProgressBar() {
    dialog = new ProgressDialog(this);
    dialog.setIndeterminate(true);
    dialog.setCancelable(false);
    dialog.setMessage("MEssgae");
    dialog.show();
}

Dialog 是类成员。

现在当我调用 volley 时，我的下一个调用是 startProgressBar - 我取消对话框 onReponse 和 onError。

原来如此

doVolleyCommand(URL);
startProgressBar();

在我的响应处理程序中：

if (dialog != null && dialog.isShowing()) { 
    dialog.dismiss();
}