毕加索SocketException

Question

当我尝试从连接速度很慢（GPRS）的磁盘下载图像时，它很长（大约10分钟）并且在从DISK获取图像之前我得到Socket异常。

compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.squareup.okhttp:okhttp:2.4.0'

OkHttpClient client = new OkHttpClient();
    client.setCache(new Cache(context.getApplicationContext().getCacheDir(), Integer.MAX_VALUE));
    client.setConnectTimeout(5, TimeUnit.SECONDS); // connect timeout
    client.setReadTimeout(15, TimeUnit.SECONDS);    // socket timeout
    Picasso.Builder builder = new Picasso.Builder(this);
    builder.downloader(new OkHttpDownloader(client));
    Picasso built = builder.build();
    built.setIndicatorsEnabled(BuildConfig.DEBUG);
    built.setLoggingEnabled(BuildConfig.DEBUG);
    Picasso.setSingletonInstance(built);

提前致谢

PS：抱歉我的英文不好

Answer 1

我使用自定义Picasso和我自己的OKHTTP3下载程序，并将磁盘缓存超时设置为6000s（100分钟lol）。根据需要修改LRU-＆gt;内存和磁盘缓存 - ＆gt;高速缓存

package com.example.project.recommendedapp;


import android.content.Context;
import android.util.Log;

import com.jakewharton.picasso.OkHttp3Downloader;
import com.squareup.picasso.LruCache;
import com.squareup.picasso.Picasso;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

import okhttp3.Cache;
import okhttp3.OkHttpClient;

//Singleton Class for Picasso Downloading, Caching and Displaying Images Library
public class PicassoSingleton {

private static Picasso mInstance;
private static long mDiskCacheSize = 50*1024*1024; //Disk Cache limit 50mb

//private static int mMemoryCacheSize = 50*1024*1024; //Memory Cache 50mb, not currently using this. Using default implementation

private static OkHttpClient mOkHttp3Client; //OK Http Client for downloading
private static OkHttp3Downloader okHttp3Downloader;
private static Cache diskCache;
private static LruCache lruCache;//not using it currently


public static synchronized Picasso getSharedInstance(Context context)
{
    if(mInstance == null) {
        if (context != null) {
            //Create disk cache folder if does not exist
            File cache = new File(context.getApplicationContext().getCacheDir(), "picasso_cache");
            if (!cache.exists()) {
                cache.mkdirs();
            }

            diskCache = new Cache(cache, mDiskCacheSize);
            //lruCache = new LruCache(mMemoryCacheSize);//not going to be using it, using default memory cache currently
            lruCache = new LruCache(context); // This is the default lrucache for picasso-> calculates and sets memory cache by itself

            //Create OK Http Client with retry enabled, timeout and disk cache
            mOkHttp3Client = new OkHttpClient.Builder().cache(diskCache).connectTimeout(6000, TimeUnit.SECONDS).build();  //100 min cache timeout



            //For better performence in Memory use set memoryCache(Cache.NONE) in this builder (If needed)
            mInstance = new Picasso.Builder(context).memoryCache(lruCache).downloader(new OkHttp3Downloader(mOkHttp3Client)).indicatorsEnabled(true).build();

        }
    }
    return mInstance;
}

public static void deletePicassoInstance()
{
    mInstance = null;
}

public static void clearLRUCache()
{
    if(lruCache!=null) {
        lruCache.clear();
        Log.d("FragmentCreate","clearing LRU cache");
    }

    lruCache = null;

}

public static void clearDiskCache(){
    try {
        if(diskCache!=null) {
            diskCache.evictAll();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    diskCache = null;

}
}

Answer 2

您的服务器可能发送的文件没有正确的缓存标头。在这种情况下，您的OKHTTP不会缓存图像。

  

Picasso没有磁盘缓存。它委托您用于该功能的任何HTTP客户端（依赖于缓存控制的HTTP缓存语义）。

Using Picasso with custom disk cache

因此，下一次，它将重试下载。我已经看到从DropBox共享链接下载的任何图像都会发生这种情况。

http响应的缓存不是图像，因此如果响应没有服务器发送的正确标头，则不会缓存它。检查是否是这种情况。尝试使用其他图像来测试。