Question

我已经在我的项目中成功实施了Retrofit 2，一切都按预期工作。但是一旦互联网不存在，应用程序就会发送多个请求失败的请求。这会创建一堆失败的请求，这些请求会不断生成并导致应用程序被挂起。

我不明白这种行为的原因。

02-01 16:16:08.812 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/india?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:08.812 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:08.812 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:08.912 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/international?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:08.912 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:08.912 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:08.922 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:08.922 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:08.942 27970-27979/? I/dalvikvm: Jit: resizing JitTable from 4096 to 8192
02-01 16:16:09.042 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/india?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:09.042 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:09.042 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.142 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/international?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:09.142 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:09.142 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.152 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.162 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.282 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/india?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:09.282 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:09.282 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.402 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/international?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:09.402 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:09.402 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.412 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.432 27970-27970/? D/dalvikvm: GC_FOR_ALLOC freed 2592K, 13% free 21331K/24320K, paused 27ms, total 27ms
02-01 16:16:09.442 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.552 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/india?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:09.552 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:09.552 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.662 27970-28054/? D/OkHttp: --> GET https://api.newsapi.in/v1/stories/category/international?nobody=true&skip=0&limit=10 http/1.1
02-01 16:16:09.662 27970-28054/? D/OkHttp: --> END GET
02-01 16:16:09.662 27970-28054/? D/OkHttp: <-- HTTP FAILED: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.662 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname
02-01 16:16:09.672 27970-27970/? E/NewsListFragment: java.net.UnknownHostException: Unable to resolve host "api.newsapi.in": No address associated with hostname

Answer 1

改造不是重试。但OkHttp有这样的功能。看看this article。它默认启用。

您可以在retryOnConnectionFailure上调用OkHttpClient.Builder来停用它。

自Retrofit 2.1.0（OkHttp 3.3.0）以来，这一变化已经出现。

Answer 2

移动设备未连接到互联网时，请勿反复请求。

在您自己的util类中创建一个常用方法，在调用Internet请求之前检查移动是否连接到Internet，然后发送请求。以下是检查您的手机是否已连接到互联网的常用方法

public static boolean hasNetworkConnection(Context context) {
    if (context == null) return false;
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
    //Was causing crash due to required permission for access network state
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null) {
        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
            return activeNetwork.isConnected();
        else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
            return activeNetwork.isConnected();
    }
    return false;
}

当互联网未连接时，Retrofit会继续重试

2 个答案: