Android, JAVA ListView Help

[sachi911]

I have a ListView on my app that extends the BaseAdapter. When i debug it via usb debugging, first time the ListView works. But when i run the app again or go back to the activity that contains the ListView, it doesnt populate. I just get a blank activity.

Here is my Adapter

public class CustomListAdapter extends BaseAdapter {

    private Activity activity;
    private LayoutInflater inflater;
    private List<Guide> guideItems;

    public CustomListAdapter(Activity activity, List<Guide> guideItems) {
        this.activity = activity;
        this.guideItems = guideItems;
    }

    @Override
    public int getCount() {
        return guideItems.size();
    }
    @Override
    public Object getItem(int location) {
        return guideItems.get(location);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

       // if (inflater == null)
            inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       // if (convertView == null)
        //    convertView = inflater.inflate(R.layout.customrow, null);
        convertView = inflater.inflate(R.layout.customrow, parent, false);

        //if (imageLoader == null)
        //    imageLoader = AppController.getInstance().getImageLoader();
       // NetworkImageView thumbNail = (NetworkImageView) convertView
       //         .findViewById(R.id.thumbnail);

        TextView ngno = (TextView) convertView.findViewById(R.id.txt_ListNgno);
        TextView name = (TextView) convertView.findViewById(R.id.txt_ListName);
        TextView email = (TextView) convertView.findViewById(R.id.txt_ListEmail);

        // getting guide data for the row
        Guide g = guideItems.get(position);
        //thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
        ngno.setText(g.getNgno());
        name.setText(g.getName());
        email.setText(g.getEmail());

        return convertView;
    }
}

This is my ListView Activity.

public class ViewGuidesActivity extends AppCompatActivity {

    private static final String TAG = ViewGuidesActivity.class.getSimpleName();
    private ProgressDialog pDialog;
    private List<Guide> guideList = new ArrayList<Guide>();
    private ListView listView;
    private CustomListAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_guides);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        this.getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        listView = (ListView) findViewById(R.id.list);
        adapter = new CustomListAdapter(this, guideList);
        listView.setAdapter(adapter);

        pDialog = new ProgressDialog(this);
        // Showing progress dialog before making http request
        pDialog.setMessage("Loading...");
        pDialog.show();

        // Creating volley request obj
        JsonArrayRequest movieReq = new JsonArrayRequest(AppConfig.URL_GET_GUIDE_LIST,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();

                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Guide guide = new Guide();
                                guide.setNgno(obj.getString("ngno"));
                                guide.setEmail(obj.getString("email"));
                                guide.setName(obj.getString("name"));


                                // adding guide to guide array
                                guideList.add(guide);

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

                        }

                        // notifying list adapter about data changes                  
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d(TAG, error.toString());
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                hidePDialog();

            }
        });

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(movieReq);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
                Guide newGuide = guideList.get(position);
                String email = newGuide.getEmail();
                String ngno = newGuide.getNgno();
                //System.out.println(email);

                Intent i = new Intent(getApplicationContext(), GuideDetails.class);
                i.putExtra("email", email);
                i.putExtra("ngno", ngno);
                startActivity(i);
            }
        });

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        hidePDialog();
    }

    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }
    
}

Any ideas why this happens? only way to fix this is to clear my application cache thought settings and run the app again. then it works the first time and same story happens. Do i have to purge the adapter memory or something when i leave the activity? ​

 

[hodakolla]

BUMPER