CODEWITHSUNDEEP
androidandroid-ndkstorageexternalsd-card
Ji.Hoon. Kim
Ji.Hoon. Kim

Reputation: 31

Removable Storage Access in Android with NDK API

My question should be kinda simple but I search a lot from the internet, cannot find the answer.

I could get the path of secondary removable storage(sdcard) with below code

String ExternalSdcardPath = System.getenv("SECONDARY_STORAGE") + "/Sample/";

and I could get path like this , /storage/external_SD/Sample/

and I tried to create file with NDK API ( fopen(ExternalSdcardPath, "a+"); )

but I couldn't create and read file with fopen..

can you please tell me how to create and read file with fopen api in removable path(secondary_storage) ?

Upvotes: 0

Views: 723

Answers (1)

CommonsWare
CommonsWare

Reputation: 1006539

I could get the path of secondary removable storage(sdcard) with below code

There is no requirement for that environment variable to exist, let alone point to something meaningful.

I couldn't create and read file with fopen

You do not have direct filesystem access to arbitrary locations on removable storage on Android 4.4+.

can you please tell me how to create and read file with fopen api in removable path(secondary_storage) ?

Your only places for direct filesystem access to removable storage is in the locations returned by getExternalFilesDirs(), getExternalCacheDirs(), and getExternalMediaDirs(). Those are all methods on Context (e.g., an activity or service). If they return 2+ values, the second and subsequent ones are on removable storage. Your Java code can supply those paths to your NDK code.

Upvotes: 2

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