The list is not displayed on

I just can’t understand what's the matter: When I load a listView into onCreate, the listView doesn’t show anything, as soon as you turn the screen off and on, the list is displayed. Help me understand the reason I'm in a stupor. AsyncTask code:

// RemoteDataTask AsyncTask private class RemoteDataTask extends AsyncTask<Void, Void, Void> { @Override protected void onPreExecute() { super.onPreExecute(); backendlessInitialize(); mProgressDialog = new ProgressDialog(ShowPUSH.this); mProgressDialog.setTitle(text1); mProgressDialog.setMessage(text2); mProgressDialog.setIndeterminate(false); mProgressDialog.show(); Typeface avenirnextregular= Typeface.createFromAsset(getAssets(), "avenirnextregular.ttf"); ((TextView) mProgressDialog.findViewById(getResources().getIdentifier("alertTitle", "id", "android"))).setTypeface(avenirnextregular); } @Override protected Void doInBackground(Void... params) { worldpopulationlist = new ArrayList<notifications>(); try { Backendless.Persistence.of( notifications.class).find(new AsyncCallback<BackendlessCollection<notifications>>(){ @Override public void handleResponse(BackendlessCollection<notifications> notification) { for (notifications pushes: notification.getData()){ notifications push = new notifications(); push.setPush((String) pushes.getPush()); push.setDatePush((String) pushes.getDatePush()); worldpopulationlist.add(push); } } @Override public void handleFault(BackendlessFault backendlessFault) { Log.i ("listView33", "error: " + backendlessFault.getMessage()); }}); } catch (Exception e) { Log.e("Error", e.getMessage()); e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { listview = (ListView) findViewById(R.id.pushes_listview); adapter = new PUSHListViewAdapter(ShowPUSH.this, worldpopulationlist); listview.setAdapter(adapter); mProgressDialog.dismiss(); } } 

Full activation code:

 public class ShowPUSH extends Activity implements SwipeRefreshLayout.OnRefreshListener { // Declare Variables ListView listview; List<ParseObject> ob; ProgressDialog mProgressDialog; PUSHListViewAdapter adapter; private List<notifications> worldpopulationlist; private SwipeRefreshLayout mSwipeRefreshLayout; String text1; String text2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.push_listview_main); setBack(); // setIcons(); SharedPreferences preferences_blurSwitch = getSharedPreferences("TEMP_BLUR", Context.MODE_PRIVATE); Integer blurSwitch = preferences_blurSwitch.getInt("TEMP_BLUR", 0); if (blurSwitch == 1){ } else{ blur(); } swipe(); // Execute RemoteDataTask AsyncTask new RemoteDataTask().execute(); } public void swipe(){ mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container); mSwipeRefreshLayout.setOnRefreshListener(this); mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.GREEN, Color.BLUE, Color.CYAN); } @Override public void onRefresh() { new RemoteDataTask().execute(); new Handler().postDelayed(new Runnable() { @Override public void run() { mSwipeRefreshLayout.setRefreshing(false); } }, 4000); } public void backendless(){ SharedPreferences YOUR_APP_ID_sp = getSharedPreferences("BACKENDLESS_APP_ID", Context.MODE_PRIVATE); SharedPreferences YOUR_SECRET_KEY_sp = getSharedPreferences("BACKENDLESS_SECRET_KEY", Context.MODE_PRIVATE); SharedPreferences APP_VERSION_sp = getSharedPreferences("BACKENDLESS_APP_VERSION", Context.MODE_PRIVATE); String YOUR_APP_ID = YOUR_APP_ID_sp.getString("BACKENDLESS_APP_ID", ""); String YOUR_SECRET_KEY = YOUR_SECRET_KEY_sp.getString("BACKENDLESS_SECRET_KEY", ""); String APP_VERSION = APP_VERSION_sp.getString("BACKENDLESS_APP_VERSION", ""); Backendless.initApp( this, YOUR_APP_ID, YOUR_SECRET_KEY, APP_VERSION ); } 

Adapter Code:

 public class PUSHListViewAdapter extends BaseAdapter { Typeface avenirnextbold; Typeface avenirnextregular; // Declare Variables Context context; LayoutInflater inflater; private List<notifications> worldpopulationlist = null; private ArrayList<notifications> arraylist; public PUSHListViewAdapter(Context context, List<notifications> worldpopulationlist) { this.context = context; this.worldpopulationlist = worldpopulationlist; inflater = LayoutInflater.from(context); this.arraylist = new ArrayList<notifications>(); this.arraylist.addAll(worldpopulationlist); } } public class ViewHolder { TextView rank; TextView country; TextView population; ImageView flag; } @Override public int getCount() { android.util.Log.i ("listView33", "worldpopulationlist.size(): " + worldpopulationlist.size()); return worldpopulationlist.size(); } @Override public Object getItem(int position) { return worldpopulationlist.get(position); } @Override public long getItemId(int position) { return position; } public View getView(final int position, View view, ViewGroup parent) { final ViewHolder holder; if (view == null) { holder = new ViewHolder(); view = inflater.inflate(R.layout.push_listview_item, null); // Locate the TextViews in listview_item.xml holder.rank = (TextView) view.findViewById(R.id.push_message); holder.country = (TextView) view.findViewById(R.id.date_push); } else { holder = (ViewHolder) view.getTag(); } // Set the results into TextViews holder.rank.setText(worldpopulationlist.get(position).getPush()); holder.country.setText(worldpopulationlist.get(position).getDatePush()); android.util.Log.i ("listView33", "older.rank.setText(worldpopulationlist.get(position).getPush());: " + worldpopulationlist.get(position).getPush()); } holder.country.setTypeface(avenirnextbold); holder.rank.setTypeface(avenirnextregular); } catch(Exception nullEx){ } return view; } 

}