安卓11 反射IKeyChainService

在 Android 11 中，IKeyChainService 接口已被标记为隐藏，并且无法通过公共 API 直接访问。如果您需要使用该接口，可以通过反射来实现访问。

以下是一个示例代码，展示了如何使用反射来访问 IKeyChainService 接口：

import android.os.IBinder;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class KeyChainServiceReflection {

    private static final String SERVICE_NAME = "android.security.IKeyChainService";

    public static IBinder getKeyChainServiceBinder() throws ClassNotFoundException,
            NoSuchMethodException, IllegalAccessException, InvocationTargetException {

        Class<?> serviceManagerClass = Class.forName("android.os.ServiceManager");
        Method getServiceMethod = serviceManagerClass.getMethod("getService", String.class);
        IBinder binder = (IBinder) getServiceMethod.invoke(null, SERVICE_NAME);

        return binder;
    }

    public static Object getKeyChainService() throws ClassNotFoundException,
            NoSuchMethodException, IllegalAccessException, InvocationTargetException {

        IBinder binder = getKeyChainServiceBinder();

        Class<?> iKeyChainServiceClass = Class.forName(SERVICE_NAME);
        Method asInterfaceMethod = iKeyChainServiceClass.getMethod("asInterface", IBinder.class);
        Object iKeyChainService = asInterfaceMethod.invoke(null, binder);

        return iKeyChainService;
    }
}

您可以使用 `getKeyChainService()` 方法来获取 IKeyChainService 接口的实例。例如，以下是如何使用此方法来获取证书链：

import android.security.IKeyChainService;
import java.lang.reflect.InvocationTargetException;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;

public class KeyChainHelper {

    public static X509Certificate[] getCertificateChain(String alias) throws Exception {
        IKeyChainService keyChainService = (IKeyChainService) KeyChainServiceReflection.getKeyChainService();

        Certificate[] certificates = keyChainService.getCertificateChain(alias);
        X509Certificate[] x509Certificates = new X509Certificate[certificates.length];

        for (int i = 0; i < certificates.length; i++) {
            x509Certificates[i] = (X509Certificate) certificates[i];
        }

        return x509Certificates;
    }
}

请注意，由于 IKeyChainService 接口是隐藏的，因此在使用反射来访问它时，可能会存在不稳定性和兼容性问题。此外，使用隐藏的 API 可能会导致应用被 Google Play 商店拒绝。因此，应该谨慎地使用此方法，并尽可能地避免使用隐藏的 API。