Android 4.x 在 https 协议下无法利用 okhttp 进行网络访问的临时解决办法

来源：互联网发布：java 时间戳编辑：程序博客网时间：2024/05/18 07:53

最近公司项目迁移了服务器，同样的也由http变成了https协议。不过调试的时候发现4.x的设备都无法进行访问网络了，5.0及以上的设备没有遇到问题。百度许久未果，在谷歌爸爸上找到了答案。
原文地址：https://github.com/square/okhttp/issues/2372

解决方法如下：

1.添加以下内容的Tls12SocketFactory.java类

import java.io.IOException;import java.net.InetAddress;import java.net.Socket;import java.net.UnknownHostException;import javax.net.ssl.SSLSocket;import javax.net.ssl.SSLSocketFactory;/** * Enables TLS v1.2 when creating SSLSockets. * <p/> * For some reason, android supports TLS v1.2 from API 16, but enables it by * default only from API 20. * @link https://developer.android.com/reference/javax/net/ssl/SSLSocket.html * @see SSLSocketFactory */public class Tls12SocketFactory extends SSLSocketFactory {    private static final String[] TLS_V12_ONLY = {"TLSv1.2"};    final SSLSocketFactory delegate;    public Tls12SocketFactory(SSLSocketFactory base) {        this.delegate = base;    }    @Override    public String[] getDefaultCipherSuites() {        return delegate.getDefaultCipherSuites();    }    @Override    public String[] getSupportedCipherSuites() {        return delegate.getSupportedCipherSuites();    }    @Override    public Socket createSocket(Socket s, String host, int port, boolean autoClose) throws IOException {        return patch(delegate.createSocket(s, host, port, autoClose));    }    @Override    public Socket createSocket(String host, int port) throws IOException, UnknownHostException {        return patch(delegate.createSocket(host, port));    }    @Override    public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException, UnknownHostException {        return patch(delegate.createSocket(host, port, localHost, localPort));    }    @Override    public Socket createSocket(InetAddress host, int port) throws IOException {        return patch(delegate.createSocket(host, port));    }    @Override    public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {        return patch(delegate.createSocket(address, port, localAddress, localPort));    }    private Socket patch(Socket s) {        if (s instanceof SSLSocket) {            ((SSLSocket) s).setEnabledProtocols(TLS_V12_ONLY);        }        return s;    }}

2.在代码中添加下面的方法

public static OkHttpClient.Builder enableTls12OnPreLollipop(OkHttpClient.Builder client) {    if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT < 22) {        try {            SSLContext sc = SSLContext.getInstance("TLSv1.2");            sc.init(null, null, null);            client.sslSocketFactory(new Tls12SocketFactory(sc.getSocketFactory()));            ConnectionSpec cs = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)                    .tlsVersions(TlsVersion.TLS_1_2)                    .build();            List<ConnectionSpec> specs = new ArrayList<>();            specs.add(cs);            specs.add(ConnectionSpec.COMPATIBLE_TLS);            specs.add(ConnectionSpec.CLEARTEXT);            client.connectionSpecs(specs);        } catch (Exception exc) {            Log.e("OkHttpTLSCompat", "Error while setting TLS 1.2", exc);        }    }    return client;}

3.最后在实例化okhttp客户端的时候，作类似如下的处理

private OkHttpClient getNewHttpClient() {    OkHttpClient.Builder client = new OkHttpClient.Builder()            .followRedirects(true)            .followSslRedirects(true)            .retryOnConnectionFailure(true)            .cache(null)            .connectTimeout(5, TimeUnit.SECONDS)            .writeTimeout(5, TimeUnit.SECONDS)            .readTimeout(5, TimeUnit.SECONDS);    return enableTls12OnPreLollipop(client).build();}

采用了上面的方法后，4.x的设备也可以正常的进行网络访问了，不过又遇到了新的坑。在4.x下，第三方的图片加载框架，无论是glide还是imageloader，都无法正常加载。看来这是网站配置证书的问题，毕竟用的是免费证书，遇到问题也不足为怪了。

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