Xposed hook to a system method

Question

I'm using a custom ROM that added some things in a system method (newApplication) and I would like to replace its behaviour depending on the application passed as argument.

Is it possible to use Xposed Framework to hook a system method, particularly my method of interest:

• https://developer.android.com/reference/android/app/Instrumentation#newApplication(java.lang.ClassLoader,%20java.lang.String,%20android.content.Context)
• https://android.googlesource.com/platform/frameworks/base/+/8f6f1f43eeb0d7263b626978ee2c21d4053bf610/core/java/android/app/Instrumentation.java#972

If yes, how can I do that? Because I can't figure out the package name I should be scoping the Xposed module to (using LSposed).

Many thanks.

Answer 1

Even though the method newApplication is in the system framework, it is called during runtime of each application.

So the Xposed scope I had to specify is actually the package name of the application that's passed as argument.