I am building one app in which I request a PHP file from server. This PHP file returns a JSONArray having JSONObjects as its elements eg,
[
{
"uniqid":"h5Wtd",
"name":"Test_1",
"address":"tst",
"email":"ru_tst@tst.cc",
"mobile":"12345",
"city":"ind"
},
{...},
{...},
...
]
my code:
/* jArrayFavFans is the JSONArray i build from string i get from response.
its giving me correct JSONArray */
JSONArray jArrayFavFans=new JSONArray(serverRespons);
for (int j = 0; j < jArrayFavFans.length(); j++) {
try {
if (jArrayFavFans.getJSONObject(j).getString("uniqid").equals(id_fav_remov)) {
//jArrayFavFans.getJSONObject(j).remove(j); //$ I try this to remove element at the current index... But remove doesn't work here ???? $
//int index=jArrayFavFans.getInt(j);
Toast.makeText(getParent(), "Object to remove...!" + id_fav_remov, Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
How do I remove a specific element from this JSONArray?
Try this code
ArrayList<String> list = new ArrayList<String>();
JSONArray jsonArray = (JSONArray)jsonObject;
if (jsonArray != null) {
int len = jsonArray.length();
for (int i=0;i<len;i++){
list.add(jsonArray.get(i).toString());
}
}
//Remove the element from arraylist
list.remove(position);
//Recreate JSON Array
JSONArray jsArray = new JSONArray(list);
Edit: Using ArrayList
will add "\\"
to the key and values. So, use JSONArray
itself
JSONArray list = new JSONArray();
JSONArray jsonArray = new JSONArray(jsonstring);
int len = jsonArray.length();
if (jsonArray != null) {
for (int i=0;i<len;i++)
{
//Excluding the item at position
if (i != position)
{
list.put(jsonArray.get(i));
}
}
}
In case if someone returns with the same question for Android platform, you cannot use the inbuilt remove()
method if you are targeting for Android API-18 or less. The remove()
method is added on API level 19. Thus, the best possible thing to do is to extend the JSONArray
to create a compatible override for the remove()
method.
public class MJSONArray extends JSONArray {
@Override
public Object remove(int index) {
JSONArray output = new JSONArray();
int len = this.length();
for (int i = 0; i < len; i++) {
if (i != index) {
try {
output.put(this.get(i));
} catch (JSONException e) {
throw new RuntimeException(e);
}
}
}
return output;
//return this; If you need the input array in case of a failed attempt to remove an item.
}
}
EDIT As Daniel pointed out, handling an error silently is bad style. Code improved.
public static JSONArray RemoveJSONArray( JSONArray jarray,int pos) {
JSONArray Njarray=new JSONArray();
try{
for(int i=0;i<jarray.length();i++){
if(i!=pos)
Njarray.put(jarray.get(i));
}
}catch (Exception e){e.printStackTrace();}
return Njarray;
}
JSONArray jArray = new JSONArray();
jArray.remove(position); // For remove JSONArrayElement
Note :- If remove()
isn't there in JSONArray
then...
API 19 from Android (4.4) actually allows this method.
Call requires API level 19 (current min is 16): org.json.JSONArray#remove
Right Click on Project Go to Properties
Select Android from left site option
And select Project Build Target greater then API 19
Hope it helps you.
i guess you are using Me version, i suggest to add this block of function manually, in your code (JSONArray.java) :
public Object remove(int index) {
Object o = this.opt(index);
this.myArrayList.removeElementAt(index);
return o;
}
In java version they use ArrayList, in ME Version they use Vector.
You can use reflection
A Chinese website provides a relevant solution:http://blog.csdn.net/peihang1354092549/article/details/41957369
If you don't understand Chinese, please try to read it with the translation software.
He provides this code for the old version:
public void JSONArray_remove(int index, JSONArray JSONArrayObject) throws Exception{
if(index < 0)
return;
Field valuesField=JSONArray.class.getDeclaredField("values");
valuesField.setAccessible(true);
List<Object> values=(List<Object>)valuesField.get(JSONArrayObject);
if(index >= values.size())
return;
values.remove(index);
}
In my case I wanted to remove jsonobject with status as non zero value, so what I did is made a function "removeJsonObject" which takes old json and gives required json and called that function inside the constuctor.
public CommonAdapter(Context context, JSONObject json, String type) {
this.context=context;
this.json= removeJsonObject(json);
this.type=type;
Log.d("CA:", "type:"+type);
}
public JSONObject removeJsonObject(JSONObject jo){
JSONArray ja= null;
JSONArray jsonArray= new JSONArray();
JSONObject jsonObject1=new JSONObject();
try {
ja = jo.getJSONArray("data");
} catch (JSONException e) {
e.printStackTrace();
}
for(int i=0; i<ja.length(); i++){
try {
if(Integer.parseInt(ja.getJSONObject(i).getString("status"))==0)
{
jsonArray.put(ja.getJSONObject(i));
Log.d("jsonarray:", jsonArray.toString());
}
} catch (JSONException e) {
e.printStackTrace();
}
}
try {
jsonObject1.put("data",jsonArray);
Log.d("jsonobject1:", jsonObject1.toString());
return jsonObject1;
} catch (JSONException e) {
e.printStackTrace();
}
return json;
}
To Remove some element from Listview in android then it will remove your specific element and Bind it to listview.
BookinhHistory_adapter.this.productPojoList.remove(position);
BookinhHistory_adapter.this.notifyDataSetChanged();
We can use iterator to filter out the array entries instead of creating a new Array.
'public static void removeNullsFrom(JSONArray array) throws JSONException {
if (array != null) {
Iterator<Object> iterator = array.iterator();
while (iterator.hasNext()) {
Object o = iterator.next();
if (o == null || o == JSONObject.NULL) {
iterator.remove();
}
}
}
}'
static JSONArray removeFromJsonArray(JSONArray jsonArray, int removeIndex){
JSONArray _return = new JSONArray();
for (int i = 0; i <jsonArray.length(); i++) {
if (i != removeIndex){
try {
_return.put(jsonArray.getJSONObject(i));
} catch (JSONException e) {
e.printStackTrace();
}
}
}
return _return;
}
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