How to use fopen for JNI native functions when building .aar?

Question

I’m trying to build a .aar library which contains native/C++ codes, so there is a jni folder at src\main\jni in the structure. One of the C++ function uses fopen to read a text file. The text file to be read is at src\main\jni along with other .cpp/.h as well. I’ve changed the file path for fopen to "/data/data/[package name]/files/XXX.txt" but it still fails. I’ve searched for some related posts but so far there’s no clear solution... thanks for any suggestions! (I'm using Android Studio 2.1.1)

The `src` folder will not be there at runtime. – user207421 May 26 '16 at 10:42 — user207421, May 26 '16 at 10:42

score 1 · Accepted Answer · edited May 23 '17 at 11:44

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You should put the text file in the assets folder instead and use the AAssetManager API to read it at runtime. This is summarised in this post: Android read text file from asset folder using C (ndk)

edited May 23 '17 at 11:44

Community

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answered May 26 '16 at 10:23

gmetal

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Thanks! Where should I add the assets folder ? **src\main\jni** or **src\main** ? – Alison May 26 '16 at 10:56
The assets folder, which will be available at runtime in your app, must be placed in src/main. – gmetal May 26 '16 at 11:05
assets folder and AssetManager really works for me, thank you! – Alison May 27 '16 at 07:55

How to use fopen for JNI native functions when building .aar?

1 Answers1