优化JSonArray for循环 [英] Optimize JSonArray for Loop

问题描述

今天，我试图优化我就 Android开发者文档 JSONArray。我本来是要优化它，但有错误消息出来了。

Today, I'm trying to optimize my JSONArray regarding android developer documentation. I was supposed to optimize it but there is error message coming out.

JSONArray infojson = json.getJSONArray("getInfo");          
for(int i=0;i < infojson.length();i++){                                     
    JSONObject e = infojson.getJSONObject(i);
    hm = new HashMap<String, Object>();
    hm.put(MYNAME, e.getString("uname"));
    hm.put(MYAGE, e.getString("uage"));
}

和我上面的编码如下优化

And I've optimized above coding as follow

JSONArray infojson = jsonObject.getJSONArray("getInfo");
for (Object o : infojson ) {
    JSONObject jsonLineItem = (JSONObject) o;
    String myname = jsonLineItem.getString("uname");
    String myage = jsonLineItem.getString("uage");
}

不幸的是，我得到了以下错误消息存在的关于infojson）{

只能遍历数组或java.lang.Iterable的实例

推荐答案

您不能使用JSONArray用这种语法，因为它没有实现的可迭代接口。作为一个侧面说明，微性能改善你可能不会影响作为从web服务返回的JSON结果通常不是规模大的应用程序的性能。

You can't use JSONArray with the that syntax as it doesn't implement Iterable interface. As a side note, the micro performance improvement you get probably won't affect your application performance as JSON results that are returned from the WebService are typically not large in size.

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