In Android Studio, when using the getApplicationContext() method in getInstance() in a Fragment in onCreateView() , the app crashes. How to fix?

Question

Java

Below is part of the Fragment code. Absolutely, the error is in the following line:

mDbxAcctMgr = DbxAccountManager.getInstance(activity.getApplicationContext(), APP_KEY, APP_SECRET);

Android does not give an error, but when Fragment is called, the application crashes. Can you please tell me why and how to fix it? APP_KEY and APP_SECRET are special keys that I got from the official website. They are required to use DropBox in the application.

public class MusicFragment extends Fragment {

    Activity activity;
    private DbxAccountManager mDbxAcctMgr;
    private static final String APP_KEY = "u**************";
    private static final String APP_SECRET = "q**************";

    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof Activity){
            activity=(Activity) context;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.activity_music, container, false);
        mDbxAcctMgr = DbxAccountManager.getInstance(activity.getApplicationContext(), APP_KEY, APP_SECRET);
        return view;
    }
}

Here is what the logs say:

Process: com.mopchik.mopchik, PID: 26357
    java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList] couldn't find "libDropboxSync.so"
        at java.lang.Runtime.loadLibrary0(Runtime.java:984)
        at java.lang.System.loadLibrary(System.java:1562)
        at com.dropbox.sync.android.NativeHttp.<clinit>(NativeHttp.java:364)
        at com.dropbox.sync.android.NativeLib.<init>(NativeLib.java:33)
        at com.dropbox.sync.android.NativeLib.<clinit>(NativeLib.java:11)
        at com.dropbox.sync.android.NativeLib.getInstance(NativeLib.java:26)
        at com.dropbox.sync.android.CoreAccountManager.initNativeLib(CoreAccountManager.java:109)
        at com.dropbox.sync.android.CoreAccountManager.<init>(CoreAccountManager.java:89)
        at com.dropbox.sync.android.DbxAccountManager.getInstance(DbxAccountManager.java:112)
        at com.dropbox.sync.android.DbxAccountManager.getInstance(DbxAccountManager.java:99)
        at com.mopchik.mopchik.MusicFragment.onCreateView(MusicFragment.java:61)
        at android.support.v4.app.Fragment.performCreateView(Fragment.java:2346)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1428)
        at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1759)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1827)
        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2596)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2383)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2338)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2245)
        at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:703)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6195)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

Answer 1

The log directly says that the .so library from dropbox was not found. The text from the title of the question has nothing to do with it. I connected the library incorrectly, most likely. Recheck. If everything is correct, you can try using ReLinker.
Unzip the apk and see if the mentioned .so is there