ElementListUnion - 简单的xml为通用列表对象提供重复的注释

时间:2013-03-21 19:03:29

标签: android generics deserialization unmarshalling simple-framework

我正在尝试使用elementlistunion

反序列化List字段
Customer.java

 @ElementListUnion({ @ElementList(inline = false, type = Thing.class),
        @ElementList(inline = false, type = AnotherThing.class) })
List<Object> things = new ArrayList<Object>();

其中Thing和AnotherThing是2个POJO。但是我得到以下异常

03-21 18:56:31.940: E/AndroidRuntime(2289): Caused by:
org.simpleframework.xml.core.PersistenceException: Duplicate annotation
of name 'things' on
@org.simpleframework.xml.ElementListUnion(value=
[@org.simpleframework.xml.ElementList(data=false,
 empty=true, entry=, inline=false, name=, required=true, type=class
 com.data.Thing), @org.simpleframework.xml.ElementList(data=false,
 empty=true, entry=, inline=false, name=, required=true, type=class
 com.data.AnotherThing)]) on field 'things' java.util.List
 com.data.Customer.things

我一直坚持这一整天。请帮助。

以下是我的回复xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<customer>
  <address>
     <no>122</no>
      <street>xxx</street>
  </address>
  <id>122</id>
  <name>James Bond</name>
  <things>
      <thing>
        <val>185</val>
      </thing>
      <thing>
        <val>162</val>
      </thing>
   </things>

1 个答案:

答案 0 :(得分:0)

我不知道你为什么要在ElementsListUnion中创建两个类。你可以使用

@ElementList(inline = false, type = Thing.class) 

而不是这个或

 @ElementListUnion({ @ElementList(inline = false, type = Thing.class, required = false),
        @ElementList(inline = false, type = AnotherThing.class, required = false) }) 

如果每次都不发送两种元素类型。