Question

我正在使用通用图像加载器，我有一个ListView，每行都有一个图像。快速向下滚动时，图像不会更新，并且会使用旧图像。但是，当慢慢向下滚动时，图像可以更新，但需要一些时间。这会让人觉得列表正在重复。这些是我的选择：

options = new DisplayImageOptions.Builder()
            .cacheInMemory(true)
            .cacheOnDisk(true)
            .considerExifParams(true)

            .displayer(new FadeInBitmapDisplayer(0, true, false, false))
            .build();

这就是我加载getView()方法的方法：

                    ImageLoader.getInstance().displayImage(MY_IMAGE_URL+imageid, holder.imgView, options, new SimpleImageLoadingListener() {
                        @Override
                        public void onLoadingStarted(String imageUri, View view) {
                            holder.progressBar.setVisibility(View.VISIBLE);
                            holder.placeHolder.setVisibility(View.VISIBLE);
                        }
                        @Override
                        public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
                            String message = null;
                            switch (failReason.getType()) {
                                case IO_ERROR:
                                    message = "Input/Output error";
                                    break;
                                case DECODING_ERROR:
                                    message = "Image can't be decoded";
                                    break;
                                case NETWORK_DENIED:
                                    message = "Downloads are denied";
                                    break;
                                case OUT_OF_MEMORY:
                                    message = "Out Of Memory error";
                                    break;
                                case UNKNOWN:
                                    message = "Unknown error";
                                    break;
                            }
                            //Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show();

                            holder.progressBar.setVisibility(View.GONE);
                        }

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

如何确保在列表视图中正确加载图像？

Answer 1

试试这个..

ImageLoader.getInstance().displayImage(MY_IMAGE_URL+imageid, holder.imgView, options);

在适配器中加载图片..

按如下方式更新DisplayImageOptions

  options = new DisplayImageOptions.Builder()
                .showImageOnLoading(android.R.color.transparent)
                .showImageForEmptyUri(android.R.color.transparent)
                .showImageOnFail(android.R.color.transparent)
                .cacheInMemory(true)
                .cacheOnDisk(true)
                .considerExifParams(true)
                .bitmapConfig(Bitmap.Config.RGB_565)
                .build();

显示并隐藏onPreExecute()的{{1}}和onPostExecute()内的进度条，该进度条由包含列表的片段/活动调用

UIL - listview重用使图像更新缓慢

1 个答案: