使用毕加索强制重新下载图像 [英] Force re-downloading image with Picasso

问题描述

我正在创建一个应用程序，它将从特定的url下载图像并将其显示在ImageView上.服务器随时间更改此图像，但url保持不变.所以我想实现这样的逻辑:

I'm creating an application which is going to download image from specific url and display it on ImageView. Server changes this image over time, but url stays the same. So I want to implement such logic:

• 旋转或重新打开应用程序时，请从应用程序缓存中加载图片
• 当用户单击下载按钮时，应从网络重新下载图像并替换缓存

如何用毕加索实现这种方法?也许其他一些库会更适合呢?

How do I implement such approach with Picasso? Or maybe some other library would fit it better?

推荐答案

Picasso.with(context)
    .load(url)
    .memoryPolicy(MemoryPolicy.NO_CACHE)
    .networkPolicy(NetworkPolicy.NO_CACHE)
    .fit()
    .centerCrop()
    .into(imageView);

每个NO_CACHE在向下加载资源时跳过高速缓存.缓存的版本将通过新内容进行更新.

Each NO_CACHE skips the cache on the way down to load the resource. The cached version will be updated by the new content.

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