How to Parse a Local JSON File from Assets into a ListView in Android?

How to Parse a Local JSON File from the Assets Folder into a ListView?

Parsing JSON files from local assets is a common task in Android programming, especially when working with static data. Here's how you can achieve this effectively:

1. Reading the JSON File:

public String loadJSONFromAsset() {
    String json = null;
    try {
        InputStream is = getActivity().getAssets().open("formules.json");
        int size = is.available();
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();
        json = new String(buffer, "UTF-8");
    } catch (IOException ex) {
        ex.printStackTrace();
        return null;
    }
    return json;
}

This method opens the "formules.json" file from the assets folder, reads its contents into a buffer, and returns the resulting JSON string.

2. Parsing the JSON String:

try {
    JSONObject obj = new JSONObject(loadJSONFromAsset());
    JSONArray m_jArry = obj.getJSONArray("formules");
    ArrayList<HashMap<String, String>> formList = new ArrayList<>();
    HashMap<String, String> m_li;

    for (int i = 0; i < m_jArry.length(); i++) {
        JSONObject jo_inside = m_jArry.getJSONObject(i);
        String formula_value = jo_inside.getString("formule");
        String url_value = jo_inside.getString("url");

        //Add values to the ArrayList as follows:
        m_li = new HashMap<>();
        m_li.put("formule", formula_value);
        m_li.put("url", url_value);

        formList.add(m_li);
    }
} catch (JSONException e) {
    e.printStackTrace();
}

Here, we parse the JSON string into a JSONObject. We then iterate through the "formules" array and extract the "formule" and "url" values. We store these values in a HashMap and add it to an ArrayList.

3. Displaying the Data in a ListView:

Once you have the data in an ArrayList, you can use an ArrayAdapter to display it in a ListView. Create an ArrayAdapter with the appropriate context and layout, and set it to your ListView.

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