How do I detect if the app uses React Native, given APK file?

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滥情空心 2021-02-07 15:52

I downloaded APK file from Google Play, and want to know if the develop of the application have used React Native library. What\'s a quick and stable way to do that? (Would be e

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  • 2021-02-07 16:37

    The accepted solution certainly will get you the right answer, but it will be quite slow. It is what I did originally, and it was not fast enough for my needs since I was running this script across hundreds of APKs. I developed an alternate solution and executed it before the original made it through 5% of the APKs.

    The reason I don't like checking for layouts having com_facebook in the name (the other pre-existing solution) is that it is entirely plausible for an app to be using another Facebook SDK that contains a layout file starting with that string. I don't know of any false positives, but it seemed reasonably likely that there would be some.

    Instead I check for the presence of libreactnativejni.so which I have to imagine only gets used if React Native is being used. (I originally was looking for libyoga.so, but I had a few false positives, I think because there's a logging library by the same name.)

    Specifically, this condition on a Mac in a bash script is what I'm using (I think it's portable, but have not tested):

    if [ "$(unzip -l $apkfile | grep libreactnativejni.so | wc -l)" -gt "0" ]
    then 
    echo "Uses RN"
    fi
    
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  • 2021-02-07 16:47

    I can offer you 2 solutions:

    • Solution 1

    You can use dex2jar. When you open the generated jar file, you can check if it uses React Native if there is a folder /com/facebook/react/.

    • Solution 2

      1. Rename your application APK app.apk into app.zip
      2. Decompress your zip file
      3. Use dexdump from AndroidSDK$ANDROID_HOME/build-tools//dexdump:dexdump classes.dex`
      4. Search for com/facebook/react in the output of dexdump
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  • 2021-02-07 16:47

    Not sure if this proven way.

    Download the apk from the store to your PC, I used APK Downloader FireFox extension (if you don't have the app apk already).

    Open apk with Zip software (I am on Linux so I used Ark). Now you can see parts of the project.

    Go to res->layout and search for com_facebook..., In my case it was com_facebook_activity_layout.xml. If you have one layout with com_facebook in it then this apk was created with React.

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