Added comments

modified:   ProfileAdapter.java
 modified:   TimeLineAdapter.java

app/MyHyvesBookPlusStagram/app/src/main/java/nl/myhyvesbookplus/tagram/ProfileAdapter.java

@@ -35,6 +35,8 @@ public class ProfileAdapter extends BaseAdapter {
     private TextView comment;
     private TextView nietSlechts;
     private ImageView photo;
+
+    /* Hold a reference to the current animator, so that it can be canceled mid-way. */
     private Animator mCurrentAnimator;
 
     /* ProfileAdapter constructor */

app/MyHyvesBookPlusStagram/app/src/main/java/nl/myhyvesbookplus/tagram/TimeLineAdapter.java

@@ -42,6 +42,8 @@ public class TimeLineAdapter extends BaseAdapter implements AdapterView.OnItemCl
     private Context mContext;
     private ArrayList<UriPost> mData;
     private DatabaseReference mRef;
+
+    /* Hold a reference to the current animator, so that it can be canceled mid-way. */
     private Animator mCurrentAnimator;
 
     /* TimeLineAdapter constructor */

app/MyHyvesBookPlusStagram/app/src/main/java/nl/myhyvesbookplus/tagram/controller/DownloadClass.java

@@ -33,10 +33,11 @@ public class DownloadClass {
                     + " must implement PostDownloadListener");
         }
         mDataRef = FirebaseDatabase.getInstance().getReference();
-        mList = new ArrayList<>();
     }
 
     public void getPostsFromServer() {
+        mList = new ArrayList<>();
+
         mDataRef.child("posts").addListenerForSingleValueEvent(new ValueEventListener() {
             @Override
             public void onDataChange(DataSnapshot dataSnapshot) {