我有一组键值对,如下所示:
{
"320x240":"http:\/\/static.example.com\/media\/content\/2012\/Jul\/mercedes-benz-a-klasse-red-t_320x240.jpg",
"300x225":"http:\/\/static.zigwheels.com\/media\/content\/2012\/Jul\/mercedes-benz-a-klasse-red-t_300x225.jpg",
"200x150":"http:\/\/static.zigwheels.com\/media\/content\/2012\/Jul\/mercedes-benz-a-klasse-red-t_200x150.jpg"
}
我目前正在做的是:
try {
images_object = new JSONObject(imageList);//imageList is a String of the above array //of key value pairs
Iterator<?> keys = images_object.keys();
String string_images = "";
if(keys.hasNext()) {
String key = (String)keys.next();
String value = (String)images_object.get(key);
string_images = "[" + value;
}
while( keys.hasNext() ){
String key = (String)keys.next();
String value = (String)images_object.get(key);
string_images = string_images + "," + value;
}
string_images = string_images + "]";
String encoded_json_string = JSONObject.quote(string_images);
images = new JSONArray(encoded_json_string);//images is of type JSONArray but it is null
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
但是,图像是NULL。为什么?我错过了什么?
答案 0 :(得分:4)
您可以将JSONObject
中当前JSONArray
的所有值设为:
Iterator<String> keys = images_object.keys();
JSONArray images = new JSONArray();
while( keys.hasNext() ){
String key = keys.next();
String value = images_object.optString(key);
//add value to JSONArray from JSONObject
images.put(value);
}
编辑
简化解决方案是使用images_object.names()
获取密钥,您可以将JSONArray
个密钥传递给toJSONArray
方法,以获取JSONArray
JSONArray keys=images_object.names();
JSONArray values=images_object.toJSONArray(keys);
总结简化解决方案是:
JSONArray images=images_object.toJSONArray(images_object.names());