Question

我正在尝试使用Retrofit从我的网站获取数据。从Android 5.0可以正常工作，但显示错误消息Connection closed by peer的Android版本较少。这是我的代码...

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("https://myWebsite.com/api/")
        .addConverterFactory(GsonConverterFactory.create())
        .build();
service = retrofit.create(MyService.class);

这是MyService类

@GET
Call<CategoryResponse> getCategoryResponse(@Url String url);

我在这里想念什么？在Android 5.0上完全可以正常工作。我认为这与SSL握手和OkHttpClient有关。我不知道如何使用OkHttpClient来实现Retrofit。

这是我的logcat

 06-29 10:50:49.906 10438-10438/com.dualbrotech.playwithprizes E/dalvikvm:       Could not find class 'android.support.v4.widget.DrawerLayout$1', referenced  from method android.support.v4.widget.DrawerLayout.<init>
06-29 10:50:49.914 10438-10438/com.dualbrotech.playwithprizes E/dalvikvm:  Could not find class 'android.view.WindowInsets', referenced from method  android.support.v4.widget.DrawerLayout.onDraw
06-29 10:50:49.917 10438-10438/com.dualbrotech.playwithprizes E/dalvikvm:  Could not find class 'android.view.WindowInsets', referenced from method  android.support.v4.widget.DrawerLayout.onMeasure
06-29 10:50:49.918 10438-10438/com.dualbrotech.playwithprizes E/dalvikvm: Could not find class 'android.view.WindowInsets', referenced from method android.support.v4.widget.DrawerLayout.onMeasure
06-29 10:50:51.219 10438-10611/com.dualbrotech.playwithprizes   E/NativeCrypto: Unknown error during handshake
06-29 10:50:52.194 10438-10615/com.dualbrotech.playwithprizes E/NativeCrypto: ssl=0x541654b8 cert_verify_callback x509_store_ctx=0x540adab8 arg=0x0
ssl=0x541654b8 cert_verify_callback calling verifyCertificateChain authMethod=ECDHE_RSA
06-29 10:50:52.254 10438-10618/com.dualbrotech.playwithprizes E/NativeCrypto: Unknown error during handshake
06-29 10:50:52.296 10438-10438/com.dualbrotech.playwithprizes E/error: javax.net.ssl.SSLException: Connection closed by peer
06-29 10:51:31.769 10438-10618/com.dualbrotech.playwithprizes E/NativeCrypto: Unknown error during handshake
06-29 10:51:35.491 10438-10618/com.dualbrotech.playwithprizes E/NativeCrypto: Unknown error during handshake
06-29 10:51:35.503 10438-10438/com.dualbrotech.playwithprizes E/error: javax.net.ssl.SSLException: Connection closed by peer

Answer 1

如果没有适当的logcat，问题将无法解决。但是，您的API服务器似乎有SSL证书问题。您可能会考虑为API服务器管理有效的SSL证书，这会消除我认为的错误。

作为解决方法，您可以考虑将所有不安全的证书信任为described here。

为了方便起见，我正在从教程中复制代码。

OkHttpClient okHttpClient = UnsafeOkHttpClient.getUnsafeOkHttpClient();

Retrofit.Builder builder = new Retrofit.Builder()  
        .baseUrl("http://10.0.2.2:3000/")
        .client(okHttpClient)
        .addConverterFactory(GsonConverterFactory.create());

Retrofit retrofit = builder.build();

UserService userClient = retrofit.create(UserService.class);

Call<ResponseBody> call = userClient.profilePicture("https://revoked.badssl.com/");  
call.enqueue(new Callback<ResponseBody>() {  
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        Toast.makeText(BadSSLActivity.this, "got response" , Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        Toast.makeText(BadSSLActivity.this, "SSL error?" , Toast.LENGTH_SHORT).show();
    }
});

请仔细阅读本教程以获得更好的理解。希望有帮助。

Answer 2

如果您查看 Retrofit 的官方文档，它会说“Retrofit 至少需要 Java 8+ 或 Android API 21+。”，其中 API 21 是棒棒糖版本.因此，任何低于此值的内容都将不受支持。

棒棒糖以下无法进行改装

2 个答案: