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Kai Pastor edited this page Aug 27, 2016 · 13 revisions

Difference between mobile platform and desktop version

  • Screen size
  • Screen resolution
  • Touch control instead of mouse + keyboard
  • Non-traditional file storage

File storage

External Storage on Android

Cf. https://source.android.com/devices/storage/

Although called "external", this storage may include emulated storage which actually resides on internal storage.

  • Traditional storage
    • Portable storage: a physical media, such as an SD card (since Android 1.0) or USB device (since Android 6.0)
    • Emulated storage: a portion of the internal (unremovable) storage, exposed through an emulation layer (since Android 3.0)
  • Adoptable storage (since Android 6.0): provided by physical media, like an SD card or USB, but encrypted and formatted to behave like internal storage, and thus tied to a particular device.

How Mapper looks from maps

Given the WRITE_EXTERNAL_STORAGE permission, Mapper is able read from to write to some locations which used to cover the internal memory and memory cards (SD cards). Mapper looks for a folder named OOMapper in the following locations:

  • the location given in the environment variable EXTERNAL_STORAGE
  • all locations given in the environment variable SECONDARY_STORAGE (separated by :)

If this folder was not found in the previous locations, it continues with the following ones (serving as a fallback):

  • /
  • /mnt
  • /mnt/sdcard
  • /sdcard
  • /storage
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