Menu
How is it possible to access files which are generated from a DocumentFile in Android KitKat/Lollipop in Native JNI Code, so I can use fopen, fread, etc. I'm particular asking this to access the external SD-Card files via the NDK.
783
androidx.documentfile.provider.DocumentFile. Representation of a document backed by either a DocumentsProvider or a raw file on disk. This is a utility class designed to emulate the traditional File interface. It offers a simplified view of a tree of documents, but it has substantial overhead.
It is also possible to use other developers’ libraries or your own if there is something that you absolutely need to use. The “ndk-build” script is the heart of the Android NDK and it is responsible for automatically going through your project and determining what to build.
***Securing Keys using ndk-build… (Item-01) step 01: Create a folder “jni” under src/main. step 02: Create a file ‘Android.mk’ under “jni” folder with following content: step 03: Create another file ‘Application.mk’ file under “jni” folder with the following content:
The Android Native Development Kit (NDK): a set of tools that allows you to use C and C++ code with Android. CMake: an external build tool that works alongside Gradle to build your native library.
You can use file descriptors:
ParcelFileDescriptor filePfd;
DocumentFile file;
filePfd = getContentResolver().openFileDescriptor(file.getUri(), "w");
int fd = filePfd.getFd();
This int fd can be passed to JNI and used as usual C++ file descriptor:
FILE* file = NULL;
file = fdopen(fd, "r+b");
And you need permission to access to file or directory on SD-card
145
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
