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xamarin - 在 Xamarin 表单中对源图像使用 https 连接

问题描述

我正在使用 Xamarin Forms (4.5.0.356) 开发应用程序。

我必须使用默认绑定显示来自 HTTPS 链接的图像：

<Image Source="{Binding PhotoURL}" />

在运行时我有错误：

javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
    at com.android.org.conscrypt.ConscryptFileDescriptorSocket.startHandshake(ConscryptFileDescriptorSocket.java:219)
    at com.android.okhttp.internal.io.RealConnection.connectTls(RealConnection.java:192)
    at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:149)
    at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:112)
    at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:184)
    at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
    at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
    at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
    at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:461)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:127)
    at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:89)
    at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(Unknown Source:0)

我知道错误是由自签名证书引起的，我通常使用HttpClientHandler管理此类错误，如下所示：

var handler = new HttpClientHandler()
            {
                ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) =>
                {
                    //bypass
                    return true;
                },
            };
_httpClient = new HttpClient(handler) { BaseAddress = new Uri(Constants.HTTP_BASE_ADDRESS) };

但是，当绑定机制将 https 源分配给图像控件时，Xamarin.Android.Net.AndroidClientHandler如何管理自签名证书？

谢谢

标签： xamarinxamarin.formsxamarin.android

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