gistfile1.java

1. created method in FlightSearchResultsActivity called:

private boolean isFilterApplied() {} 

private void updateFilterMessage() {
        if (isFilterApplied() && mSearchHasCompleted) {
            Set<ItineraryFilter> itineraryFilters = ItinerarySet.getInstance().itineraryFilters();
            final String sb = getSelectedFiltersString(this, itineraryFilters);
            mFilterMessagePanel.setVisibility(VISIBLE);
            mFilterMessagePanel.post(new Runnable() {
                @Override
                public void run() {
                    mFilterMessage.setText("Filters Applied: " + sb);
                }
            });
        } else {
            mFilterMessagePanel.setVisibility(GONE);
        }
    }

2.  set this updateFilterMessage() into onResume.

    public void onResume() {
        super.onResume();
        mBus.register(this);
        // KLT: This is set true so list updates after coming back from filter screen.
        if (mSearchHasCompleted) {
            updateItinerarySummaryText(ItinerarySet.getInstance());
            updateFilterMessage();
        } else if (mPartialresults != null) {
            updateItinerarySummaryText(mPartialresults);
        }
        if (ItinerarySet.getInstance() != null && ItinerarySet.getInstance().isComplete()) {
            onSearchComplete(ItinerarySet.getInstance());
        }
        mItinerarySet = ItinerarySet.getInstance();
        updateFilterMessage();
    }

3. add layout info in seach_result_header.xml

<RelativeLayout
        android:id="@+id/filter_summary_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:layout_marginTop="2dp"
        android:layout_marginBottom="5dp"
        android:visibility="gone">

        <com.tripadvisor.android.taflights.views.RobotoTextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:background="@drawable/itinerary_summary_highlighter"
            android:textColor="@color/tripadvisor_list_text_disabled_gray"
            android:textSize="13sp"
            custom:fontType="regular"/>

        <com.tripadvisor.android.taflights.views.RobotoTextView
            android:id="@+id/applied_filters_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingEnd="4dip"
            android:paddingLeft="4dip"
            android:paddingRight="4dip"
            android:paddingStart="4dip"
            android:textColor="@color/tripadvisor_list_text_disabled_gray"
            android:textSize="13sp"
            custom:fontType="regular"/>
    </RelativeLayout>
    
    4. for ticket : https://jira.tripadvisor.com/browse/FLT-1691
   
   I found that the method getSelectedFiltersString() in Utils is not right, so I am thinking is to change that when filter class is null &&
   the size in each of filters is 0, means we do not apply any filter.
   So in Utils.java, I create the filter reference for each filters. and get these reference value from mUserItineraryFilters in 
   ItinerarySet.java. So, I can iterate all the museritineraryFilter