How to clear cache and Reload Image in Picasso?

问题

I am using Picasso to load image in my application but i facing a issue that my image URL is same but image is changing from backend calling the same URL but Picasso loading the same image saved in its cache. Now i want to clear the cache for that Image and reload the image again.

What i have tried i searched on SO find that we can use picasso.invalidate(fileName); or memoryPolicy(MemoryPolicy.NO_CACHE) but i am getting the error message in code

Can't reslove method invalidate

Can't reslove method memoryPolicy

dependency for picasso in gradle :

compile 'com.squareup.picasso:picasso:2.4.0'

回答1:

invalidate() and memoryPolicy() were introduced in later versions of the library. To use either of them update picasso to the latest version

compile 'com.squareup.picasso:picasso:2.5.2'

回答2:

Try to use this.

 Picasso.with(context).invalidate(url); 
 Picasso.with(context).load(url).networkPolicy(NetworkPolicy.NO_CACHE).memoryPolicy(MemoryPolicy.NO_CACHE);

compile 'com.squareup.picasso:picasso:2.5.2'

回答3:

append at the end of url "?=" + System.currentTimeMillis();

回答4:

use okhttp client for picasso like below

okHttpClient = new OkHttpClient();
picasso = new Picasso.Builder(this)
            .downloader(new OkHttpDownloader(okHttpClient))
            .build();

and if it didn't work set okhttp client cache control to network

setCacheControl(CacheControl.FORCE_NETWORK);

回答5:

Picasso supports both download and error placeholders as optional features and latest version in gradle. Check url in your code when calling each time

Picasso.with(context)
    .load(url)
    .placeholder(R.drawable.user_placeholder)
    .error(R.drawable.user_placeholder_error)
    .into(imageView);

来源：https://stackoverflow.com/questions/40459000/how-to-clear-cache-and-reload-image-in-picasso

标签

android

picasso