如何从android中的字节数组加载一个类？

byte[] classBytes = ... // 获取字节数组
ByteArrayInputStream bais = new ByteArrayInputStream(classBytes);

class CustomClassLoader extends ClassLoader {
    public Class<?> loadClass(byte[] classBytes) {
        return super.defineClass(classBytes, 0, classBytes.length);
    }
}

CustomClassLoader classLoader = new CustomClassLoader();
Class<?> clazz = classLoader.loadClass(classBytes);

Object instance = clazz.getDeclaredConstructor().newInstance();

Method method = clazz.getMethod("methodName");
method.invoke(instance);