[*]public class InformationSummary { [*] /** [*] * id [*] */ [*] public String id; [*] [*] /** [*] * 栏目名称 [*] */ [*] public String name; [*] [*] /** [*] * 栏目图片 [*] */ [*] public String picture; [*] [*] /** [*] * 栏目内容 [*] */ [*] public String content; [*] [*] /** [*] * 新闻头条id [*] */ [*] public String newsId; [*] [*] /** [*] * 子业务编码 [*] */ [*] public String subCode; [*] [*] [*] [*] public InformationSummary(String id, String name, String picture, String content) { [*] super(); [*] this.id = id; [*] this.name = name; [*] this.picture = picture; [*] this.content = content; [*] }
如果这样写的话,有时候会报这样的错误;
06-26 17:08:59.723: W/System.err(4724): java.lang.RuntimeException: No-args constructor for class com.funo.health.bean.business.InformationSummary does not exist. Register an InstanceCreator with Gson for this type to fix this problem.
06-26 17:08:59.723: W/System.err(4724): at com.google.gson.MappedObjectConstructor.constructWithNoArgConstructor(MappedObjectConstructor.java:64)
简单认识就是我们自己写了构造函数后,本身自带的无参就会忽略,但是json.jar包中的Gson,需要!简单方法就是加上无参数构造函数!
参考:
http://stackoverflow.com/questions/3294829/java-reading-json-null