Read Json File In Android And Populate In Listview

I write this piece of code for reading json file and show it in listview but it return empty list . I would appreciate if anybody advise me. Thanks eventList.json: { 'events'

Solution 1:

The variable sb holds the consumed JSON data.

There was no reference to actual JSON object as it was empty.

JSONObject jsonObjMain = newJSONObject();

Change the code block:

try {
   JSONObject jsonObjMain = newJSONObject(sb.toString());
   JSONArray jsonArray = jsonObjMain.getJSONArray("events");
   // ... 

There is a undefined reference to the JSON field, "msg", maybe it should be "event"?

// Getting data from individual JSONObject
String message = jsonArray.getString(i);
messages.add(message);

Solution 2:

Change to below code :

publicclassJsonActivityextendsAppCompatActivity {

    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_json);

        // Reading json file from assets folderStringBuffer sb = newStringBuffer();
        BufferedReader br = null;
        try {
            br = newBufferedReader(newInputStreamReader(getAssets().open(
                    "eventList.json")));
            String temp;
            while ((temp = br.readLine()) != null)
                sb.append(temp);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if ((br != null)) {
                try {
                    br.close(); // stop reading
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        try {
            JSONObject jsonObjMain = newJSONObject(sb.toString());
            JSONArray jsonArray = jsonObjMain.getJSONArray("events");

            ArrayList<String> messages = newArrayList<String>();
            for (int i = 0; i < jsonArray.length(); i++) {
                // Creating JSONObject from JSONArrayJSONObjectobject = jsonArray.getJSONObject(i);
                String message = object.getString("event");
                messages.add(message);
            }

            ArrayAdapter<String> adapter = newArrayAdapter<String>(JsonActivity.this,
                    android.R.layout.simple_list_item_1, messages);
            ListView list = (ListView) findViewById(R.id.eventList);
            list.setAdapter(adapter);
            list.setOnItemClickListener(newAdapterView.OnItemClickListener() {

                @OverridepublicvoidonItemClick(AdapterView<?> parent, View view,
                                        int position, long id) {
                    Toast.makeText(JsonActivity.this, "TEST List View", Toast.LENGTH_SHORT).show();

                }
            });

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }


}