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I am analyzing a dex file and to ease with reverse engineering, I converted it a jar so it could be decompiled. In the file android/support/v17/leanback/media/MediaControllerGlue.class, the following import appears:

import android.support.v4.media.session.MediaControllerCompat;

However, this class is not defined. In fact, there is no android/support/v4/media package in the file.

To confirm, this, I listed the referenced type in the type_ids section of the dex file, and sure enough, the following type is present: android/support/v4/media/MediaControllerCompat. However, when I then iterate over all entries in the class_defs section, this class is nowhere to be found.

I am new to Android (this is actually an Amazon Firestick APK) development/reverse engineering so I'm not sure how this is possible. Is there some way of defining classes in a separate library that would exist outside of the APK?

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  • Did you check whether there are multiple dex files? What tool did you use to do the jar conversion?
    – Antimony
    Commented Jul 25, 2019 at 14:44
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    There is only one dex file. I used dex2jar but the problem doesn't lie in the jar conversion since I inspected the contents of the dex file directly.
    – genghiskhan
    Commented Jul 25, 2019 at 15:40

1 Answer 1

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As it turns out, this class (and other not defined in the DEX file) are part of the standard Android library. Therefore, I suppose they're linked from a shared object at runtime.

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