Method getView

app/src/main/java/eu/faircode/email/ActivityView.java:579–611

(View view, RecyclerView parent, int pos)

                }

                private View getView(View view, RecyclerView parent, int pos) {
                    if (pos == NO_POSITION)
                        return null;

                    if (!getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
                        return null;

                    TupleAccountFolder prev = adapterNavAccount.getItemAtPosition(pos - 1);
                    TupleAccountFolder account = adapterNavAccount.getItemAtPosition(pos);
                    if (pos > 0 && prev == null)
                        return null;
                    if (account == null)
                        return null;

                    if (pos > 0) {
                        if (Objects.equals(prev.category, account.category))
                            return null;
                    } else {
                        if (account.category == null)
                            return null;
                    }

                    View header = inflater.inflate(R.layout.item_nav_group, parent, false);
                    TextView tvCategory = header.findViewById(R.id.tvCategory);

                    tvCategory.setText(account.category);

                    header.measure(View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.EXACTLY),
                            View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
                    header.layout(0, 0, header.getMeasuredWidth(), header.getMeasuredHeight());

                    return header;
                }
            };
            rvAccount.addItemDecoration(categoryDecorator);
        }