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static Future getStateByDeviceID() async { var headers = <String, String>{'Authorization': basicAuth}; Response r = await get( Uri.http(url, "driverTablet/getStateByDeviceID/" + Constant.deviceID), headers: headers); if (r.body.contains('"Result":null')) { return null; } else { var json = jsonDecode(r.body); return GetStateByDeviceID.fromJson(json); } }