The following JSON Object (a variable named json_object) is composed of two values

• peripheral_devices
• peripheral_tests

both of which are arrays:

{
    "peripheral_devices": [
        {
            "_id": 1,
            "active": -1,
            "battery": "63",
            "bt_firmware_version": "btv1.7.777",
            "configured": 0,
            "connected": 0,
            "consumer_id": 22,
            "create_date": 1635807323224,
            "device_id": 72,
            "discovered": 0,
            "firmware_version": "v3.14",
            "hardware_version": "null",
            "icon": "icon_device_bp5",
            "last_connect_date": 1640023710420,
            "mac_address": "8C:DE:52:41:FC:57",
            "model": "BP5 41FC57",
            "name": "BP5",
            "other_id": "-1",
            "paired": -1,
            "type_id": 1,
            "update_date": 1635807323224,
            "user_id": 13
        },
        {
            "_id": 3,
            "active": -1,
            "battery": "90",
            "bt_firmware_version": "1.0.0",
            "configured": -1,
            "connected": 0,
            "consumer_id": 22,
            "create_date": 1635807323239,
            "device_id": 72,
            "discovered": 0,
            "firmware_version": "1.0.0",
            "hardware_version": "5.0.0",
            "icon": "icon_device_hs2s",
            "last_connect_date": 1640022147928,
            "mac_address": "00:4D:32:0C:B7:2C",
            "model": "HS2S 11070",
            "name": "HS2S",
            "other_id": "-1",
            "paired": -1,
            "type_id": 3,
            "update_date": 1635807323239,
            "user_id": 13
        }
    ],
    "peripheral_tests": [
        {
            "_id": 199,
            "consumer_id": 22,
            "create_date": 1640020949760,
            "end_date": 1640020949078,
            "mood_id": -1,
            "notes": "",
            "start_date": 1640020939533,
            "status_id": 1,
            "type_id": 2,
            "update_date": 0,
            "user_id": -99
        },
        {
            "_id": 198,
            "consumer_id": 22,
            "create_date": 1640020904183,
            "end_date": -1,
            "metric_bps": {,
            "mood_id": -1,
            "notes": "",
            "start_date": 1640020863742,
            "status_id": 1,
            "type_id": 1,
            "update_date": 0,
            "user_id": -99
        },
        {
            "_id": 197,
            "consumer_id": 22,
            "create_date": 1640020834664,
            "end_date": 1640020828741,
            "mood_id": -1,
            "notes": "",
            "start_date": 1640020822580,
            "status_id": 1,
            "type_id": 3,
            "update_date": 0,
            "user_id": -99
        }
    ]
}

and derived as follows:

JSONObject json_object = new JSONObject(post_data);

Using org.json.JSONArray.JSONArray:

JSONArray peripheral_devices = json_object.getJSONArray("peripheral_devices");

works as expected and a json array is parsed from json_object. However, using the same technique to get the second array in the object does not:

JSONArray json_tests = new JSONArray("peripheral_tests");

throws exception:

A JSONArray text must start with '[' at 1 [character 2 line 1]

Why? What am I not understanding?

CodePudding user response：

You code

JSONArray json_tests = new JSONArray("peripheral_tests");

Take string in the constructor which is the JSON data and peripheral_tests is not JSON array, to get peripheral_tests you need to get it from json_object like

JSONArray peripheral_devices = json_object.getJSONArray("peripheral_tests");

CodePudding user response：

The input JSON is invalid, accoring to JSON Lint ...which may lead to unexpected results:

Error: Parse error on line 69:
..."metric_bps": {              ,               "mood_id": -1,
----------------------^
Expecting 'STRING', '}', got ','