Sdcard usage for caching requires more permissions than Google's Maps API

[mar-v-in]

This means, applications might have problems accessing or writing to the cache which can end in empty maps or no maps at all.

Possible workaround for self-compiled apps is to add android.permission.READ_EXTERNAL_STORAGE and android.permission.WRITE_EXTERNAL_STORAGE as used permission.

To use a global cache without requiring storage permission, we need a helper application (a ContentProvider?) that has the required permissions and does not require them for map tile access.

[RalfJung]

Wouldn't it be an alternative to simply fall back to a per-application cache if the read/write permissions are missing? That sounds easier to implement, at least.