android - ViewPager 滑动

Question

我有 ViewPager(Slide) 和 3 张图片。共有三个图像是通过 Internet 下载的。如果我将图片换到服务器上的另一台服务器上，链接保持不变，但应用程序中的图片没有改变，仍然是缓存中的图片

public class ViewPagerAdapter extends PagerAdapter {

    private Context context;
    private LayoutInflater layoutInflater;
    private String [] image = {"http://rgho.st/7hDcbyT2F/image.png",
            "http://guid-korenovsk.my1.ru/logos.png",
            "https://4.bp.blogspot.com/-JKogH2VCCoY/V_aZWCFsmtI/AAAAAAAABAA/Lu6D13VXGSMMnYFO8T8-pKDeqbkHhNRAwCLcB/s320/VideoThumbail.PNG"};



    public ViewPagerAdapter(Context context) {
        this.context = context;
    }

    @Override
    public int getCount() {
        return image.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
       layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = layoutInflater.inflate(R.layout.bulding_layout, null);
        ImageView imageView = (ImageView)view.findViewById(R.id.imageViewPager);

        Glide.with(context)
                .load(image[position])
                .diskCacheStrategy(DiskCacheStrategy.SOURCE)
                .into(imageView);







        ViewPager vp = (ViewPager)container;
        vp.addView(view,0);
        return view;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        ViewPager vp = (ViewPager)container;
        View view = (View)object;
        vp.removeView(view);
    }

}

 public class MyTimerTask extends TimerTask {

        @Override
        public void run() {
           getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if(viewPagerAds.getCurrentItem() == 0){
                        viewPagerAds.setCurrentItem(1);
                    }else if(viewPagerAds.getCurrentItem() == 1){
                        viewPagerAds.setCurrentItem(2);
                    }else viewPagerAds.setCurrentItem(0);
                }
            });
        }
    }

Answer 1

您可以在这个 Glide 实例上使用 DiskCacheStrategy.NONE 来避免缓存图像。在这种情况下，Glide 每次都会重新下载图像。要获得更优化的版本，您必须检查方法 signature() 并在服务器使其数据无效时使用自定义签名。链接到关于缓存失效的 Glide wiki:https://github.com/bumptech/glide/wiki/Caching-and-Cache-Invalidation