Android Q: file.mkdirs() returns false

Question

We have an app that uses external storage to store some temporary files: images, binary data. The code for that has been working for a few years without big changes until re

Answer 1

There was huge privacy change in android Q by introducing Scoped Storage.

Since Q beta 4 it's possible to opt-out of that feature by:

• targeting API 28 (or lower)
• using requestLegacyExternalStorage manifest attribute (while targetting API 29):

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edit: as mentioned in other answer this does not work if app is targeting API 30 - Android 11 devices will ignore legacy storage flag.