Taking Collector 18.0.3 offline on Android 7.0 - java error

[TylerSchlachter]

On two projects lately I have run into the same error when trying to take a map offline. Sync and permissions are right, I can get through setting the work area extents, once I choose my extents I get the following message in a pop-up:

Map failed to download

The map '[Map Title]' failed to download with the message: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase(java.util.Locale) ' on a null object reference

This has happened on two maps in the last 2-3 weeks. Any advice on moving this forward would be appreciated.

[GeoJosh]

Hey Tyler. Are you using an Esri basemap or a custom basemap? If custom, try switching to an Esri basemap and see if the issue still occurs.

[TylerSchlachter]

I am using an ESRI basemap.

[RockyRudolph]

Hi, I have this exact same error on five different Samsung Tab Active 2 tablets. Model SM-T390 Android version 7.1.1. The same AGOL project files work fine on an iOS device.  Any troubleshooting steps we can try? Thanks

[RockyRudolph]

I tried a few other basemaps and was eventually able to get it to work with three of them. I'm not sure how to reference them but I went to the details of each one and provided the link. Not sure if this helps diagnose the issue. I didn't try all of the basemaps in AGOL.

These work
World Topo farther down the list
https://tiledbasemaps.arcgis.com/arcgis/rest/services/World_Topo_Map/MapServer
World Ocean
https://services.arcgisonline.com/arcgis/rest/services/Ocean/World_Ocean_Reference/MapServer
National Geographic
https://services.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer

These fail with the error or don't show up at all when trying to set the extent
World Street Map
https://www.arcgis.com/sharing/rest/content/items/de26a3cf4cc9451298ea173c4b324736/resources/styles/root.json
The World topo at the top of the list
https://nps.maps.arcgis.com/home/item.html?id=7dc6cea0b1764a1f9af2e679f642f0f5
World imagery
https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer
Streets (night)
https://www.arcgis.com/sharing/rest/content/items/86f556a2d1fd468181855a35e344567f/resources/styles/root.json
Navigation
https://www.arcgis.com/sharing/rest/content/items/63c47b7177f946b49902c24129b87252/resources/styles/root.json
Terrain with Labels
https://www.arcgis.com/sharing/rest/content/items/14fbc125ccc9488888b014db09f35f67/resources/styles/root.json

[RobCahalan]

Tyler, did you ever figure this out?

[RobCahalan]

I am receiving this same error on a Samsung S10e with Android version 9, Collector for ArcGIS version 18.0.3. I tried to do an Uninstall/Reinstall and still the problem persists. I tried to download on an iPad and that worked. Is there a bug with Androids?

[RobCahalan]

I figured out my issue...I did not have an extent set for my web map. I had 6 layers in my map and the first 3 added were empty data sets which made my extent global. I zoomed into my project area, saved and then "Voila!" I could download.

[BrettShaver]

I'm having the exact same issue.  I think it has to do with vector tile basemaps.  I can download the standard "World Imagery" correctly, but I cannot download the world imagery + vector tile reference layer.  I think until the beta version of collector for Android has the ability to on-demand download offline areas (as oppose to pre-setting of map areas for download), we will be forced to use non vector tile basemaps for collector.  

[Kylie]

Since this post is still getting some views, I wanted to mention here that the Android beta does support on-demand downloads. 

Also, the original post was about the released Android app, and as discussed in this thread, it doesn't support vector basemaps. The beta, however, does support them.