Writing to a JSON file

Question

I am working on an android application using a json file in order to store data used by the application. I have a Json file in the asset folder, including one object "plants". In the Dashboard.java file, I would like to add an object to the json file. I tried this by using the put() function, but I doesnt seem to write in the actual file. Dashboard.java :

 String name = intent.getStringExtra(AddAPlant.EXTRA_TEXT1); String description = intent.getStringExtra(AddAPlant.EXTRA_TEXT2); String url = intent.getStringExtra(AddAPlant.EXTRA_TEXT3); JSONObject jsonObj= new JSONObject(); try { jsonObj.put("name", name); jsonObj.put("description", description); jsonObj.put("cameralink", url); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } plantArray = new JSONArray(); plantArray.put(jsonObj);

Json file located in asset folder :

{ "plants": [ { "name": "Pepper", "decription": "This is a big plant", "CameraLink": "https://messir.uni.lu/bicslab/blab-cam1-snapshots/gallery-images/latest.png" }, { "name": "Tomatoe", "decription": "This is a big plant", "CameraLink": "https://messir.uni.lu/bicslab/blab-cam2-snapshots/gallery-images/latest.png" }, { "name": "Small Tomato", "decription": "It needs a lot of water", "CameraLink": "https://messir.uni.lu/bicslab/blab-cam3-snapshots/gallery-images/latest.png" } ] }

Desired output :

{ "plants": [ { "name": "Pepper", "decription": "This is a big plant", "CameraLink": "https://messir.uni.lu/bicslab/blab-cam1-snapshots/gallery-images/latest.png" }, { "name": "Tomatoe", "decription": "This is a big plant", "CameraLink": "https://messir.uni.lu/bicslab/blab-cam2-snapshots/gallery-images/latest.png" }, { "name": "Small Tomato", "decription": "It needs a lot of water", "CameraLink": "https://messir.uni.lu/bicslab/blab-cam3-snapshots/gallery-images/latest.png" }, { "name": name, "decription": description, "CameraLink": url ] }

You first need to instantiate plantArray by parsing its content from the json file. You can find instructions on how do it in the answers to this question: How to parse JSON array from file? — razumichin
– razumichin, Commented Apr 26, 2020 at 10:57

denniz crypto · Accepted Answer · 2020-04-26 11:49:23Z

i do not think it is possible to write to /assets at run time check this answer

try using app specific files docs

To make changes to JSON. Read from file (String data) and initialize a JSONobject.

JSONObject obj = new JSONObject("string from your file")

 JSONObject jsonObject = new JSONObject("data from file"); JSONArray jsonArray = jsonObject.getJSONArray("plants"); JSONObject jsonObj = new JSONObject(); jsonObj.put("name", name); jsonObj.put("description", description); jsonObj.put("cameralink", url); jsonArray = jsonArray.put(jsonObj); jsonObject = jsonObject.put("plants", jsonArray); //convert json object to string String data = jsonObject.toString(); FileOutputStream fout = context.openFileOutput(filename, Context.MODE_PRIVATE); fout.write(data.getBytes());

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