Is there a way to convert JSON Array to normal Java Array for android ListView data binding?
Is there a way to convert JSON Array to normal Java Array for android ListView data binding?
Using Java Streams you can just use an IntStream mapping the objects:
JSONArray array = new JSONArray(jsonString);
List<String> result = IntStream.range(0, array.length())
.mapToObj(array::get)
.map(Object::toString)
.collect(Collectors.toList());
private String[] getStringArray(JSONArray jsonArray) throws JSONException {
if (jsonArray != null) {
String[] stringsArray = new String[jsonArray.length()];
for (int i = 0; i < jsonArray.length(); i++) {
stringsArray[i] = jsonArray.getString(i);
}
return stringsArray;
} else
return null;
}
We can simply convert the JSON into readable string, and split it using "split" method of String class.
String jsonAsString = yourJsonArray.toString();
//we need to remove the leading and the ending quotes and square brackets
jsonAsString = jsonAsString.substring(2, jsonAsString.length() -2);
//split wherever the String contains ","
String[] jsonAsStringArray = jsonAsString.split("\",\"");
To improve Pentium10s Post:
I just put the elements of the JSON array into the list with a foreach loop. This way the code is more clear.
ArrayList<String> list = new ArrayList<String>();
JSONArray jsonArray = (JSONArray)jsonObject;
jsonArray.forEach(element -> list.add(element.toString());
You can use iterator:
JSONArray exportList = (JSONArray)response.get("exports");
Iterator i = exportList.iterator();
while (i.hasNext()) {
JSONObject export = (JSONObject) i.next();
String name = (String)export.get("name");
}
I know that the question was for Java. But I want to share a possible solution for Kotlin because I think it is useful.
With Kotlin you can write an extension function which converts a JSONArray into an native (Kotlin) array:
fun JSONArray.asArray(): Array<Any> {
return Array(this.length()) { this[it] }
}
Now you can call asArray() directly on a JSONArray instance.