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<blockquote data-quote="sachi911" data-source="post: 20128510" data-attributes="member: 265113">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

[CODE]public class CustomListAdapter extends BaseAdapter {

&nbsp; &nbsp; private Activity activity;
&nbsp; &nbsp; private LayoutInflater inflater;
&nbsp; &nbsp; private List&lt;Guide&gt; guideItems;

&nbsp; &nbsp; public CustomListAdapter(Activity activity, List&lt;Guide&gt; guideItems) {
&nbsp; &nbsp; &nbsp; &nbsp; this.activity = activity;
&nbsp; &nbsp; &nbsp; &nbsp; this.guideItems = guideItems;
&nbsp; &nbsp; }

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

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

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

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

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

&nbsp; &nbsp; &nbsp; &nbsp; return convertView;
&nbsp; &nbsp; }
}[/CODE]


This is my ListView Activity.


[CODE]public class ViewGuidesActivity extends AppCompatActivity {

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


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

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

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

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

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

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

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


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

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

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }

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

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; });

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

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

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

&nbsp; &nbsp; }

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

&nbsp; &nbsp; private void hidePDialog() {
&nbsp; &nbsp; &nbsp; &nbsp; if (pDialog != null) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pDialog.dismiss();
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pDialog = null;
&nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; }
&nbsp; &nbsp; 
}[/CODE]


Any ideas why this happens? <img src="/styles/default/xenforo/smilies/default/sad.gif"&nbsp; class="smilie" loading="lazy" alt=":(" title="Sad&nbsp; &nbsp; :(" data-shortname=":(" /> 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? </blockquote>

[QUOTE="sachi911, post: 20128510, member: 265113"] [CENTER][SIZE="3"]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[/SIZE] [CODE]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; } }[/CODE] [SIZE="3"]This is my ListView Activity.[/SIZE] [CODE]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; } } }[/CODE] [SIZE="3"]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? [/SIZE][/CENTER] [/QUOTE]

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