Maps: Avoid OOM with large maps

Adding the tile renderer layer before setting the track boundaries would
load the entire maps to memory, which would cause OOM issues for some
large maps.

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/maps/MapsManager.java

@@ -63,6 +63,7 @@ public final class MapsManager {
     private Polyline polyline;
 
     private TileRendererLayer tileRendererLayer;
+    private boolean tileRenderedAdded;
 
     private boolean isMapLoaded = false;
 
@@ -153,8 +154,8 @@ public final class MapsManager {
             theme = MapTheme.DEFAULT;
         }
         tileRendererLayer.setXmlRenderTheme(theme);
-
-        mapView.getLayerManager().getLayers().add(0, tileRendererLayer);
+        // Do not add the tile renderer layer before setting the bounding box in setTrack,
+        // otherwise we load the entire map to memory and might crash with OOM
     }
 
     public boolean isMapLoaded() {
@@ -169,7 +170,9 @@ public final class MapsManager {
         }
 
         if (tileRendererLayer != null) {
-            mapView.getLayerManager().getLayers().remove(tileRendererLayer);
+            if (tileRenderedAdded) {
+                mapView.getLayerManager().getLayers().remove(tileRendererLayer);
+            }
             tileRendererLayer.onDestroy();
             tileRendererLayer.getTileCache().purge();
             tileRendererLayer = null;
@@ -205,7 +208,6 @@ public final class MapsManager {
             mapView.addLayer(polyline);
         }
         polyline.setPoints(points);
-        mapView.getLayerManager().redrawLayers();
 
         mapView.setCenter(new LatLong(minLat + (maxLat - minLat) / 2, minLon + (maxLon - minLon) / 2));
         final DisplayMetrics displayMetrics = mContext.getResources().getDisplayMetrics();
@@ -215,6 +217,11 @@ public final class MapsManager {
                 mapView.getModel().displayModel.getTileSize()
         );
         mapView.setZoomLevel(zoom);
+
+        if (!tileRenderedAdded) {
+            mapView.getLayerManager().getLayers().add(0, tileRendererLayer);
+            tileRenderedAdded = true;
+        }
     }
 
     public void reload() {