How can I access .so file in apk at runtime?

Question

I'd like to access(read) my .so file built in NDK at runtime in order to check up on its hash value.

To do that, I used AAssetManager_open() function but always failed.

const char* filename = "/data/data/com.mycompany.app/lib/libmyndk.so"; // failed with this.

const char* filename = "assets/libmyndk.so"; // Also failed with this.

AAsset* asset = AAssetManager_open(mgr, (const char*) filename, AASSET_MODE_UNKNOWN);

Please let me know why it persist to fail.

score 1 · Accepted Answer · answered Nov 10 '14 at 07:05

I solved out this issue. We don't need to use AssetManager for just simply accessing.

just use fopen() in NDK(c/c++ files).

for example,

void initNDK()
{
     const char* filename = "/data/data/com.company.app/lib/libmyndk.so";
     FILE* fp = fopen(filename, "rb");
     if(fp) 
         TRACE("Success");
     else
         TRACE("Failure");
}

Thank you All.

score 0 · Answer 2 · answered Nov 10 '14 at 05:31

0

you have load .so file during application start.

By

static {
    System.loadLibrary("libpacman");
}

Than you can access file .

i hope this is help you.

answered Nov 10 '14 at 05:31

Bhagirathsinh Gohil

673
1
9
25

Pretty good idea. but What can I do with this? Could you give an example to read the so file in binary mode or anything else? – GT Kim Nov 10 '14 at 06:01

score 0 · Answer 3 · answered Nov 10 '14 at 05:51

0

Have you tried:

const char* filename = "libmyndk.so";

answered Nov 10 '14 at 05:51

sybond

167
9

Yes, it fails. AAssetManager_open() returns NULL. – GT Kim Nov 10 '14 at 06:00
But strangely, the following statement also fails. const char* filename = "AndroidManifest.xml"; – GT Kim Nov 10 '14 at 06:03

score 0 · Answer 4 · answered Nov 10 '14 at 06:54

Above all, I succeeded in reading/accessing some file in assets folder with AAssetManager_open(). But this AAssetManager_xxxx() functions seem to be only available to access files in assets folder.

What I want to do is to access my .so file built in NDK. Still looking for answer.

score -1 · Answer 5 · edited May 23 '17 at 12:23

-1

If you want to use native files you need to use android NDK.

This link will help you if you use Eclipce: How do I import a native library (.so file) into Eclipse?

And this is for Android Studio: http://www.kylethielk.com/blog/include-native-so-library-in-apk-with-android-studio/

I hope it helps to resolve your problem.

edited May 23 '17 at 12:23

Community

1
1

answered Nov 10 '14 at 12:58

QArea

4,955
1
12
22

How can I access .so file in apk at runtime?

5 Answers5