Make calls to database asyncronous

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/fragment/FeedFragment.java

@@ -2,6 +2,7 @@ package in.ac.iitb.gymkhana.iitbapp.fragment;
 
 
 import android.app.Activity;
+import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.design.widget.FloatingActionButton;
 import android.support.v4.app.Fragment;
@@ -13,6 +14,7 @@ import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Toast;
 
 import com.google.gson.Gson;
 
@@ -75,8 +77,7 @@ public class FeedFragment extends BaseFragment {
         super.onStart();
 
         appDatabase = AppDatabase.getAppDatabase(getContext());
-        final List<Event> events = appDatabase.dbDao().getAllEvents();
-        displayEvents(events);
+        new showEventsFromDB().execute();
 
         updateFeed();
 
@@ -99,8 +100,7 @@ public class FeedFragment extends BaseFragment {
                     List<Event> events = newsFeedResponse.getEvents();
                     displayEvents(events);
 
-                    appDatabase.dbDao().deleteEvents();
-                    appDatabase.dbDao().insertEvents(events);
+                    new updateDatabase().execute(events);
                 }
                 //Server Error
                 feedSwipeRefreshLayout.setRefreshing(false);
@@ -114,6 +114,25 @@ public class FeedFragment extends BaseFragment {
         });
     }
 
+    private class updateDatabase extends AsyncTask<List<Event>, Void, Integer> {
+        @Override
+        protected Integer doInBackground(List<Event>... events) {
+            appDatabase.dbDao().deleteEvents();
+            appDatabase.dbDao().insertEvents(events[0]);
+            return 1;
+        }
+    }
+
+    private class showEventsFromDB extends AsyncTask<String, Void, List<Event>> {
+        @Override
+        protected List<Event> doInBackground(String... events) {
+            return appDatabase.dbDao().getAllEvents();
+        }
+        protected void onPostExecute(List<Event> result) {
+            displayEvents(result);
+        }
+    }
+
     private void displayEvents(final List<Event> events) {
         final FeedAdapter feedAdapter = new FeedAdapter(events, new ItemClickListener() {
             @Override