{
"key1": "value1",
"key2": "value2",
"key3": "value3"
}
How I can get each item's key and value without knowing the key nor value beforehand?
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1stackoverflow.com/questions/9151619/…Jesse Jashinsky– Jesse Jashinsky2012-11-26 22:06:28 +00:00Commented Nov 26, 2012 at 22:06
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5 Answers
Use the keys() iterator to iterate over all the properties, and call get() for each.
Iterator<String> iter = json.keys();
while (iter.hasNext()) {
String key = iter.next();
try {
Object value = json.get(key);
} catch (JSONException e) {
// Something went wrong!
}
}
3 Comments
tudor -Reinstate Monica-
Note: You can't use the short form for (String s: json.keys()) { ... } It's a real shame that neither JSONArray nor JSONObject are iterable. :-(
Pravinsingh Waghela
what is json here? Json Object, Json Array or anthing else?
Nicolás Carrasco-Stevenson
@PravinsinghWaghela it's a JSONObject as specified in the question
Short version of Franci's answer:
for(Iterator<String> iter = json.keys();iter.hasNext();) {
String key = iter.next();
...
}
3 Comments
Pravinsingh Waghela
what is json here? Json Object, Json Array or anthing else?
Roozbeh Zabihollahi
json is JsonObject
Denny
@PravinsinghWaghela pretty sure the OP asked how to loop through a json object.
You'll need to use an Iterator to loop through the keys to get their values.
Here's a Kotlin implementation, you will realised that the way I got the string is using optString(), which is expecting a String or a nullable value.
val keys = jsonObject.keys()
while (keys.hasNext()) {
val key = keys.next()
val value = targetJson.optString(key)
}
Comments
You shold use the keys() or names() method. keys() will give you an iterator containing all the String property names in the object while names() will give you an array of all key String names.
You can get the JSONObject documentation here
http://developer.android.com/reference/org/json/JSONObject.html
Comments
Take a look at the JSONObject reference:
http://www.json.org/javadoc/org/json/JSONObject.html
Without actually using the object, it looks like using either getNames() or keys() which returns an Iterator is the way to go.
1 Comment
Weetu
Wrong link. The
JSONObject in Android doesn't have getNames(). developer.android.com/reference/org/json/JSONObject.html