In my case, the root & intermediate certificates was successfully installed but I still got "Trust anchor for certification path not found." exception!. After digging the android document, found out that by default, secure connections (using protocols like TLS and HTTPS) from all apps trust the pre-installed system CAs, and apps targeting Android 6.0 (API level 23) and lower also trust the user-added CA store by default. If your app running on a OS with api level higher than 23 you should explicitly allow the app to trust user-added CA by adding its address to network_security_config like bellow:

<domain-config>
        <domain includeSubdomains="true">PUT_YOUR_SERVER_ADDERESS</domain>
        <trust-anchors>
            <certificates src="user" />
        </trust-anchors>
</domain-config>

您可以在运行时信任特定的证书。 只需从服务器下载，放入资产，然后使用ssl-utils-android像这样加载:

OkHttpClient client = new OkHttpClient();
SSLContext sslContext = SslUtils.getSslContextForCertificateFile(context, "BPClass2RootCA-sha2.cer");
client.setSslSocketFactory(sslContext.getSocketFactory());

在上面的例子中，我使用了OkHttpClient，但是SSLContext可以用于Java中的任何客户端。

如果你有任何问题，请提出来。我是这个小图书馆的作者。

**Set proper alias name**
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509","BC");
            X509Certificate cert = (X509Certificate) certificateFactory.generateCertificate(derInputStream);
            String alias = cert.getSubjectX500Principal().getName();
KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
            trustStore.load(null);
trustStore.setCertificateEntry(alias, cert);

我在从Android客户端连接到Kurento服务器时遇到了同样的问题。 Kurento服务器使用jks证书，所以我必须将pem转换为它。 作为转换的输入，我使用cert.pem文件，它会导致这样的错误。 但如果使用全链。pem，而不是cert.pem - all是OK的。

如果你使用了改装，你需要定制你的OkHttpClient。

retrofit =新的retrofit . builder () .baseUrl (ApplicationData.FINAL_URL) .build .client (getUnsafeOkHttpClient () ()) .addConverterFactory (GsonConverterFactory.create ()) .build ();

完整代码如下。

public class RestAdapter {

    private static Retrofit retrofit = null;
    private static ApiInterface apiInterface;

    public static OkHttpClient.Builder getUnsafeOkHttpClient() {
        try {
            // Create a trust manager that does not validate certificate chains
            final TrustManager[] trustAllCerts = new TrustManager[]{
                new X509TrustManager() {
                    @Override
                    public void checkClientTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
                    }

                    @Override
                    public void checkServerTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
                    }

                    @Override
                    public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                        return new java.security.cert.X509Certificate[]{};
                    }
                }
            };
    
                // Install the all-trusting trust manager
                final SSLContext sslContext = SSLContext.getInstance("SSL");
                sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
    
                // Create an ssl socket factory with our all-trusting manager
                final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
    
                OkHttpClient.Builder builder = new OkHttpClient.Builder();
                builder.sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0]);
                builder.hostnameVerifier(new HostnameVerifier() {
                    @Override
                    public boolean verify(String hostname, SSLSession session) {
                        return true;
                    }
                });
                return builder;
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        
        public static ApiInterface getApiClient() {
            if (apiInterface == null) {
    
                try {
                    retrofit = new Retrofit.Builder()
                            .baseUrl(ApplicationData.FINAL_URL)
                            .client(getUnsafeOkHttpClient().build())
                            .addConverterFactory(GsonConverterFactory.create())
                            .build();
    
                } catch (Exception e) {
    
                    e.printStackTrace();
                }
    
    
                apiInterface = retrofit.create(ApiInterface.class);
            }
            return apiInterface;
        }
        
    }

回复一个很旧的帖子。但也许它会帮助一些新手，如果以上都行不通的话。

解释:我知道没人想听废话解释;而是解决方案。但是在一行代码中，您试图从本地计算机访问服务到不信任您的计算机的远程计算机。您的请求需要获得远程服务器的信任。

解决方案:下面的解决方案假设您满足以下条件

试图从本地机器访问远程api。 你正在为Android应用开发 您的远程服务器在代理过滤下(您在浏览器设置中使用代理来访问远程api服务，通常是登台或开发服务器) 你是在真实的设备上测试

步骤:

你需要一个.keystore扩展文件来注册你的应用。如果你不知道如何创建.keystore文件;然后按照以下小节创建.keystore文件，否则跳转到下一小节签署Apk文件

创建.keystore文件

打开Android Studio。单击顶部菜单Build > Generate Signed APK。在下一个窗口中单击Create new…按钮。在新窗口中，请在所有字段中输入数据。记住我建议的两个密码字段应该有相同的密码;不要使用不同的密码;并且记住最上面字段的保存路径键存储路径:。输入所有字段后单击OK按钮。

签署Apk文件

现在需要使用刚才创建的.keystore文件构建一个签名应用程序。遵循以下步骤

Build > Clean Project, wait till it finish cleaning Build > Generate Signed APK Click Choose existing... button Select the .keystore file we just created in the Create .keystore file section Enter the same password you created while creating in Create .keystore file section. Use same password for Key store password and Key password fields. Also enter the alias Click Next button In the next screen; which might be different based on your settings in build.gradle files, you need to select Build Types and Flavors. For the Build Types choose release from the dropdown For Flavors however it will depends on your settings in build.gradle file. Choose staging from this field. I used the following settings in the build.gradle, you can use the same as mine, but make sure you change the applicationId to your package name productFlavors { staging { applicationId "com.yourapplication.package" manifestPlaceholders = [icon: "@drawable/ic_launcher"] buildConfigField "boolean", "CATALYST_DEBUG", "true" buildConfigField "boolean", "ALLOW_INVALID_CERTIFICATE", "true" } production { buildConfigField "boolean", "CATALYST_DEBUG", "false" buildConfigField "boolean", "ALLOW_INVALID_CERTIFICATE", "false" } } Click the bottom two Signature Versions checkboxes and click Finish button.

几乎有:

所有艰苦的工作都完成了，现在是真理的运动。为了访问通过代理备份的登台服务器，您需要在您的实际测试Android设备中进行一些设置。

Android设备的代理设置:

点击Android手机内的设置，然后点击wi-fi 长按已连接的wifi，选择“修改网络” 如果看不到代理主机名字段，则单击高级选项 在代理主机名中输入要连接的主机IP或名称。典型的登台服务器将命名为stg.api.mygoodcompany.com 端口输入四位数端口号，例如9502 点击保存按钮

最后一站:

记住，我们在签名apk文件部分生成了签名apk文件。现在是时候安装APK文件了。

打开终端，更改为已签名的apk文件夹 将你的Android设备连接到你的机器 从Android设备中删除之前安装的apk文件 执行adb安装apk文件的名称 如果由于某种原因，上述命令返回adb命令没有找到。填写完整路径为:C:\Users\shah\AppData\Local\Android\sdk\platform-tools\adb.exe安装apk文件的名称

我希望问题能得到解决。如果没有，请给我留言。

萨拉姆!