改造不适用于特定版本的android [英] Retrofit not working on specific versions of android

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问题描述

我在运行Android 4.3的模拟器上存在Retrofit问题，并且我的设备在Android 4.4.2上，而相同的代码在运行Android 7.1.1的另一个模拟器上通常可以正常运行

每次我尝试执行get请求时，都会收到超时异常. 

java.net.SocketTimeoutException: failed to connect to jsonplaceholder.typicode.com/2606:4700:30::681c:3f5 (port 443) after 10000ms
        at libcore.io.IoBridge.connectErrno(IoBridge.java:159)
        at libcore.io.IoBridge.connect(IoBridge.java:112)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
        at java.net.Socket.connect(Socket.java:842)
        at okhttp3.internal.platform.AndroidPlatform.connectSocket(AndroidPlatform.java:73)
        at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:246)
        at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:166)
        at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257)
        at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
        at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
        at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:200)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
        at java.lang.Thread.run(Thread.java:841)

代码在下面

public interface Api {
    String BASE_URL = "https://jsonplaceholder.typicode.com/";

    @GET("posts")
    Call<ArrayList<Post>> getPosts();
}

和对api的调用

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(Api.BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .build();

Api api = retrofit.create(Api.class);
Call<ArrayList<Post>> call = api.getPostes();
Log.i("RequestUrl", call.request().url().toString());
call.enqueue(new Callback<ArrayList<Post>>() {
    @Override
    public void onResponse(Call<ArrayList<Post>> call, Response<ArrayList<Post>> response) {
        mPostsList.setValue(response.body());
    }

    @Override
    public void onFailure(Call<ArrayList<Post>> call, Throwable t) {
        Log.e("Posts", "Error occurred", t);
    }
});

解决方案

它读取java.net.SocketTimeoutException，起初建议提高客户端的连接超时值，如以下okhttp3.internal.platform.AndroidPlatform的/java/okhttp3/internal/platform/AndroidPlatform.kt"rel =" noreferrer>源代码 ...这暗示了不兼容的协议.

服务器的 TLS配置历史记录. OkHttp3版本.似乎3.12.x甚至已经支持TLS 1.3，因为将来Android Q会要求它.甚至不需要降级OkHttp3，因为3.12.x中的MODERN_TLS仍然支持TLSv1，而在3.13.x中它已经移到了COMPATIBLE_TLS中.仍然不确定3.14.x.

即使使用当前版本的OkHttp3，也可能仍可以将所需的TLS 1.0协议重新添加到ConnectionSpec.COMPATIBLE_TLS中，因为这是使用方法.add()的ArrayList-在没有任何保证的情况下，不会再出现不兼容的情况； 3.12.x可能仍然是支持Android 4.x及更高版本的最佳选择，甚至可能会有一些较新功能的后端口.

I have a problem with Retrofit on my emulator running Android 4.3 and my device is on Android 4.4.2 while the same code runs normally on another emulator with Android 7.1.1

Each time I try to execute the get request I get a timeout exception. 

java.net.SocketTimeoutException: failed to connect to jsonplaceholder.typicode.com/2606:4700:30::681c:3f5 (port 443) after 10000ms
        at libcore.io.IoBridge.connectErrno(IoBridge.java:159)
        at libcore.io.IoBridge.connect(IoBridge.java:112)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
        at java.net.Socket.connect(Socket.java:842)
        at okhttp3.internal.platform.AndroidPlatform.connectSocket(AndroidPlatform.java:73)
        at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:246)
        at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:166)
        at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257)
        at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
        at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
        at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:200)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
        at java.lang.Thread.run(Thread.java:841)

The code is below

public interface Api {
    String BASE_URL = "https://jsonplaceholder.typicode.com/";

    @GET("posts")
    Call<ArrayList<Post>> getPosts();
}

and the call to the api

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(Api.BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .build();

Api api = retrofit.create(Api.class);
Call<ArrayList<Post>> call = api.getPostes();
Log.i("RequestUrl", call.request().url().toString());
call.enqueue(new Callback<ArrayList<Post>>() {
    @Override
    public void onResponse(Call<ArrayList<Post>> call, Response<ArrayList<Post>> response) {
        mPostsList.setValue(response.body());
    }

    @Override
    public void onFailure(Call<ArrayList<Post>> call, Throwable t) {
        Log.e("Posts", "Error occurred", t);
    }
});

解决方案

It reads java.net.SocketTimeoutException, which at first suggests to raise the client's connect-timeout value, as it is being explained in this answer - but when reviewing the current source code of okhttp3.internal.platform.AndroidPlatform... this rather hints for incompatible protocols.

The server's SSL certificate supports TLS 1.0, as it would be required for Android 4.x (there's no problem on their side); the problem rather is, that the current version of OkHttp3 does not support TLS 1.0 anymore and therefore the handshake won't ever take place (that's why it throws such a misleading SocketTimeoutException instead of a SSLHandshakeException).

With OkHttp3 3.12.x, it should still be supported with the default configuration MODERN_TLS -

but one could instruct OkHttp3 3.13.x to use configuration COMPATIBLE_TLS instead:

/* ConnectionSpec.MODERN_TLS is the default value */
List tlsSpecs = Arrays.asList(ConnectionSpec.MODERN_TLS);

/* providing backwards-compatibility for API lower than Lollipop: */
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    tlsSpecs = Arrays.asList(ConnectionSpec.COMPATIBLE_TLS);
}

OkHttpClient client = new OkHttpClient.Builder()
    .connectionSpecs(tlsSpecs)
    .build();

One also has to set it as the client for Retrofit:

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl(Api.BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .setClient(client)
    .build();

See the TLS Configuration History for the available protocol support, per OkHttp3 version. As it seems, 3.12.x even already supports TLS 1.3, as it will in future be required for Android Q. It might not even be required to down-grade OkHttp3, because MODERN_TLS of 3.12.x still supports TLSv1, while in 3.13.x it had been moved into COMPATIBLE_TLS; still uncertain about 3.14.x.

Even with current versions of OkHttp3, one could possibly still add the desired TLS 1.0 protocol back into ConnectionSpec.COMPATIBLE_TLS, since this is an ArrayList with a method .add() - without any guarantee, that there won't be further incompatibilities; 3.12.x might still be the best choice for supporting Android 4.x onward and there might even be back-ports of newer features.

这篇关于改造不适用于特定版本的android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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