What limits are there on the number of Android res

问题:

One of our apps has several thousand small data files that we're currently packaging as assets. It would help our code if we could package them as raw resources. I have tried to track down what the limits are for the number of resources an app can have of each type, but I haven't found any documentation on this. Does anyone know what the limits are on the number of Android resources?

回答1:

After a lot of experimenting, it seems that you can have up to 16 bits worth of resources (65,536 resources) for each resource type. (There may be additional bits reserved for future use, which would reduce the max resource count, but I couldn't find any evidence of this.) It would be nice if someone could provide an authoritative answer, but after a year, I'm giving up.

EDIT (see the comment below by @B T): Based on this answer by hackbod in another thread, It seems that there are, indeed, 16 bits available, so one can have up to 65,535 resources of any one type (not 65,536, because zero is not available). Also, note that this limit applies only to the number of resources for a single configuration (locale, pixel density, etc.). Variations of a resource for different configurations share the same resource ID and don't contribute to the count. So you can actually have a lot more than 65,535 resources of any one type (e.g., layout or string), just not for any one configuration.

回答2:

There's no explicit documentation on this that I know of either, however one can make reasonable assumptions that the Android devs have designed Android appropriately given their recommendations. They recommend that you put strings and drawables into resources with the potential to supply different ones for different locales, screen sizes, screen densities and orientations. The sheer number of these possibilities suggests to me that they expect apps to include thousands of resources and you'll be just fine supplying a few thousand small raw resources.

回答3:

Taken into account the automatically class R and the resource value used in the api I would assume somewhere around Integer.MAX_INTEGER for string, drawable and layout id each.