JNI loading : Warning : Do not hardcode use Context.getFilesDir().getPath() instead

Question

I am facing a problem in one of my app, I have the following code to load a lib (JNI) the app needs :

static {
    // load the JNI library
    Log.i("JNI", "loading JNI library...");
    System.load("/data/data/com.mypackage.appname/lib/libxxxxxx.so");
    Log.i("JNI", "JNI library loaded!");
}

So i get get the warning : "Do note hardcode use Context.getFilesDir().getPath() instead" which is totally rightful (It's not going to be portable on every devices). The thing is, because I am using static I can't call for Context.getFilesDir().getPath().

Do you have any ideas on how I can proceeded to do it ?

In system.Load I get : Do not hardcode "/data/"; use Context.getFilesDir().getPath() instead — Joze
– Joze, Commented Mar 5, 2013 at 9:23
Arrived here due to the lint warning saying the same in Eclipse. Spotted this post, which if correct, is a little worrying: code.google.com/p/android/issues/detail?id=43533 — brandall
– brandall, Commented Mar 5, 2013 at 20:32
You would normally accomplish this using System.loadLibrary() which takes only the name of the library without path, lib prefix, or .so extension (all of which are automatically filled in as appropriate for the platform in use) — Chris Stratton
– Chris Stratton, Commented May 19, 2013 at 18:08

Ali · Accepted Answer · 2014-03-30 14:46:54Z

12

your warning is absolutely clear, try the following way instead:

make the following class:

public class MyApplication extends Application {
    private static Context c;

    @Override
    public void onCreate(){
        super.onCreate();

        this.c = getApplicationContext();
    }

    public static Context getAppContext() {
        return this.c;
    }
}

declare the above class in your android manifest:

<application android:name="com.xyz.MyApplication"></application>

And then

static {
    // load the JNI library
    Log.i("JNI", "loading JNI library...");

    System.load(MyApplication.getAppContext().getFilesDir().getParentFile().getPath() + "/lib/libxxxxxx.so");

    Log.i("JNI", "JNI library loaded!");
}

P.S not tested

edited Mar 30, 2014 at 14:46

answered Mar 5, 2013 at 9:19

Ali

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3 Comments

Joze Over a year ago

Thanks for your answer but I get : Cannot make a static reference to the non-static method getFilesDir() from the type Context

Joze Over a year ago

Just tried it but I get : /data/data/com.mypackage.appname/files instead of what I need : /data/data/com.mypackage.appname/ (no files). Any guesses ?

Joze Over a year ago

Works perfectly. Thanks a lot ! Validated + "+1" ;)

Community · Accepted Answer · 2017-05-23 12:33:35Z

1

You can get Context from your class derived from Application. take a look into example So you can use your application context everywhere:)

edited May 23, 2017 at 12:33

CommunityBot

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answered Mar 5, 2013 at 9:19

Taras

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