Fix #215 - Add occupancy (#948)

* Use vector icon for occupancy
* Switch LinearLayouts to ConstraintLayouts to hold occupancy views
* Realign chevron in vehicle marker balloon - Caveat - "the actual position of the view stays at the original position (before translation), it will be translated only visually. Thereby, onClick events will be only triggered from within the old position. See https://stackoverflow.com/a/51652722/937715."  This is ok for us because the entire layout is one giant hit target based on what the Google Maps API supports for marker balloons, so we can't even detect the hit target for the chevron itself.
* Parse responses for arrivals-and-departures-for-stop, trip-details, and trips-for-route APIs
* Add occupancy visibility and color unit tests - Note that directing inflating views doesn't seem to work in unit tests with getContext() or getTargetContext() so we'll use the adapter here instead to do it for us
* Add occupancy content description utility method and unit tests
* Add "About occupancy" menu option for arrivals list
* Add real-time occupancy About placeholder text - This should be replaced with icons after the design is finalized
* Reformat XML and add tools text
* Also do cleanup for hard-coded strings for debugging, extra imports, whitespace

onebusaway-android/build.gradle

@@ -60,6 +60,8 @@ android {
 
         multiDexEnabled true
 
+        vectorDrawables.useSupportLibrary = true
+
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
@@ -423,6 +425,7 @@ dependencies {
     }
     implementation 'android.arch.lifecycle:extensions:1.1.1'
     implementation 'android.arch.lifecycle:common-java8:1.1.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2'
     implementation 'commons-io:commons-io:2.4'
     // Open311 client library
     implementation 'edu.usf.cutr:open311client:1.0.9'

onebusaway-android/src/amazon/java/org/onebusaway/android/map/googlemapsv2/VehicleOverlay.java

@@ -26,6 +26,21 @@
  */
 package org.onebusaway.android.map.googlemapsv2;
 
+import android.app.Activity;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.drawable.GradientDrawable;
+import android.location.Location;
+import android.os.Handler;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
 import com.amazon.geo.mapsv2.AmazonMap;
 import com.amazon.geo.mapsv2.model.BitmapDescriptor;
 import com.amazon.geo.mapsv2.model.BitmapDescriptorFactory;
@@ -39,27 +54,14 @@
 import org.onebusaway.android.io.elements.ObaTrip;
 import org.onebusaway.android.io.elements.ObaTripDetails;
 import org.onebusaway.android.io.elements.ObaTripStatus;
+import org.onebusaway.android.io.elements.OccupancyState;
 import org.onebusaway.android.io.request.ObaTripsForRouteResponse;
 import org.onebusaway.android.ui.TripDetailsActivity;
 import org.onebusaway.android.ui.TripDetailsListFragment;
 import org.onebusaway.android.util.ArrivalInfoUtils;
 import org.onebusaway.android.util.MathUtils;
 import org.onebusaway.android.util.UIUtils;
 
-import android.app.Activity;
-import android.content.Context;
-import android.content.res.Resources;
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.graphics.drawable.GradientDrawable;
-import android.location.Location;
-import android.os.Handler;
-import android.util.Log;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.widget.ImageView;
-import android.widget.TextView;
-
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -901,6 +903,7 @@ public View getInfoContents(Marker marker) {
             TextView lastUpdatedView = (TextView) view.findViewById(R.id.last_updated);
             ImageView moreView = (ImageView) view.findViewById(R.id.trip_more_info);
             moreView.setColorFilter(r.getColor(R.color.switch_thumb_normal_material_dark));
+            ViewGroup occupancyView = view.findViewById(R.id.occupancy);
 
             // Get route/trip details
             ObaTrip trip = mLastResponse.getTrip(status.getActiveTripId());
@@ -967,6 +970,16 @@ public View getInfoContents(Marker marker) {
                 mMarkerRefreshHandler.postDelayed(mMarkerRefresh, MARKER_REFRESH_PERIOD);
             }
 
+            if (status.getRealtimeOccupancy() != null) {
+                // Real-time occupancy data
+                UIUtils.setOccupancyVisibilityAndColor(occupancyView, status.getRealtimeOccupancy(), OccupancyState.REALTIME);
+                UIUtils.setOccupancyContentDescription(occupancyView, status.getRealtimeOccupancy(), OccupancyState.REALTIME);
+            } else {
+                // Hide occupancy by setting null value
+                UIUtils.setOccupancyVisibilityAndColor(occupancyView, null, OccupancyState.REALTIME);
+                UIUtils.setOccupancyContentDescription(occupancyView, null, OccupancyState.REALTIME);
+            }
+
             return view;
         }