Esri seems to have dropped support for Collector on Android devices running OS v. 5 or lower, or there is a bug that primarily affects those devices. Our organization is getting sync failure on several makes and models of devices running Android 5 or lower, while devices running 6, 7, and 8 are able to sync. Also, one of our volunteers reports that Collector is not available in the Google Play Store for his device, which runs Android 4.0. This is troubling since Google reported in December that nearly 30% of active devices are running Android 5 or lower. Also, Collector routinely crashes after about 10 minutes or less on my Android 8.1 device (Pixel 2XL). Our organization has been experiencing difficulty using Collector on Android devices in general since we began using ArcGIS, but since the software is ideal for our application we have tried to deal with the problems as best as we can, which is hard when asking volunteers to deal with the frustration.
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My group operates in a large area (National Forest) and has need of Imagery basemaps with high resolution. We can download several (25) separate Imagery basemaps to the level we desire to cover our work area, but then we cannot easily differentiate them from one another to know which area each of them covers. One of the Ideas posted on GeoNet is adding the ability to label the basemaps in Collector to solve that problem. However, other map applications have the ability to add tiles to an existing downloaded map, effectively merging the basemap downloads to be used seamlessly over a large area. I have seen instances where the download manager is 'smart' and will only download tiles that do not already exist on the device. Using this method, you can either add area (extent) to a map or even add resolution (map detail) to an existing downloaded basemap. This would be a great solution to our problem, bypassing the need to label the basemaps or even to change basemaps when moving to other areas. It would also be more efficient as far as device memory; currently we have to overlap the basemap coverage to avoid having to change maps frequently when our route crisscrosses the edge of the basemap coverage. It would also add the ability to tailor the downloaded basemap coverage to irregular shapes, rather than the standard square.
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