Universal Image Loader在每次滚动后重新加载图像

Question

根据标题,如何在ListView中的每次滚动后停止UIL重新加载图像？

以下是我实现Image Loader的方法:

public class LatestAdapter extends BaseAdapter {

    ...

    // UIL
    private ImageLoaderConfiguration config;
    private File cacheDir;
    private DisplayImageOptions options;
    private ImageLoader imageLoader = ImageLoader.getInstance();

    public LatestAdapter(Context context, ArrayList<ItemListModel> items) {
        this.arrItemList = items;
        this.context = context;

        if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
            cacheDir=new File(android.os.Environment.getExternalStorageDirectory(),"JunkFolder");
        else
            cacheDir=context.getCacheDir();
        if(!cacheDir.exists())
            cacheDir.mkdirs();

        options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.drawable.placeholder)
                .showImageOnFail(R.drawable.error)
                .bitmapConfig(Bitmap.Config.RGB_565)
                .imageScaleType(ImageScaleType.IN_SAMPLE_INT)
                .build();

        config = new ImageLoaderConfiguration.Builder(context)
                .memoryCache(new WeakMemoryCache())
                .denyCacheImageMultipleSizesInMemory()
                .discCache(new UnlimitedDiscCache(cacheDir))
                .threadPoolSize(5)
                .defaultDisplayImageOptions(options)
                .build();


        imageLoader.init(config);
    }

    ...

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {

        ...

        imageLoader.displayImage(nm.getThumbnail().getImage100(), vh.tvThumbnail, options, new ImageLoadingListener() {
            @Override
            public void onLoadingStarted(String s, View view) {
            }

            @Override
            public void onLoadingFailed(String s, View view, FailReason failReason) {
            }

            @Override
            public void onLoadingComplete(String s, View view, Bitmap bitmap) {
            }

            @Override
            public void onLoadingCancelled(String s, View view) {
            }
        });
    }
}

每次我滚动ListView(向上或向下),它都不会保存以前加载的图像,而是重新加载ImageView.如何"保存"图像,使其不会在每个卷轴上闪烁？

Answer 1

在每个图像加载之前启用光盘缓存和内存缓存User ImageAware类,如下所示

ImageAware imageAware = new ImageViewAware(imageview,false); imageloader.displayImage(url,imageAware,otions);