在JNI中获取项目内文件的相对路径

Question

Using JNI I can't get access to files like this:

ifstream file("file.txt");

file.txt is in folder jni , which is the same folder as the native code files

I can only access absolute path ( "/sdcard/file.txt" ), but this trick is not what I'm looking for. Tried "data/data/com.example.SomeExample/jni/file.txt" but no luck.

How should I refer to a file as reletive path when working in native code?

Answer 1

The jni folder is not added to your APK. If you want files to be bundled with your application, I'd suggest putting them in the assets folder. If the assets folder doesn't already exist, place it at the same level as the jni folder (so they are siblings).

If you take this approach you will have to use the Asset Manager. This has a native interface, found in android/asset_manager.h. To open your file use:

AAsset *a = AAssetManager_open(pAssetManager, "file.txt", AASSET_MODE_BUFFER);
if (a)
{
    const void *res = AAsset_getBuffer(a);
    //do something with the file!
    AAsset_close(a);
}

There are different flags you can pass in instead of AASSET_MODE_BUFFER .