JSONArray rewrites its contents

I am trying to generate an Array using the following method:

json = new JSONObject();
jsArray = new JSONArray();
for (int i = 1; i < j; i++) {
    CheckBox checkBox = (CheckBox) findViewById(i);
    if (checkBox.isChecked()) {
        try {
            String ean = (String) checkBox.getText();
            json.put("ean", ean);
            jsArray.put(json);
            Log.v("jsArray", jsArray.toString());
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

The output I am getting from this code is as follows (the last line being important):

04-06 19:07:02.238: V/jsArray(9894): [{"ean":"8029694000"}]
04-06 19:07:02.238: V/jsArray(9894): [{"ean":"8029694200"},{"ean":"8029694200"}]
04-06 19:07:02.238: V/jsArray(9894): [{"ean":"8029694300"},{"ean":"8029694300"},{"ean":"8029694300"}]

However, I actually want this result:

[{"ean":"8029694000"}, {"ean":"8029694200"}, {"ean":"8029694300"}]

I'm puzzled as to why the Array keeps getting overwritten with the "old" ean variables?

androidarraysjson

Answer â„–1

According to @SatelliteSD's explanation, the issue arises from using the same JSONObject within each iteration. This causes the values in that object to be updated repeatedly, resulting in multiple outputs of the same value. To rectify this problem, consider rewriting your code as shown below:

jsArray = new JSONArray();
for (int i = 1; i < j; i++) {
    CheckBox checkBox = (CheckBox) findViewById(i);
    if (checkBox.isChecked()) {
        try {
            String ean = (String) checkBox.getText();
            JSONObject json = new JSONObject();
            json.put("ean", ean);
            jsArray.put(json);
            Log.v("jsArray", jsArray.toString());
        } catch (JSONException e) {
            // Handle JSON exception
            e.printStackTrace();
        }
    }
}

Answer â„–2

Your information is stored within the "json" object, as well as having a reference to that same data in your json jsArray. Consequently, when you retrieve and display the contents of the array, it will only show the data from the final assignment made within the loop.

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