[Compatibility] Obfucation/ProGuard Android

[Clemon-R]

Hello everyone,

I use the package on huge scale (around 1millions devices) i have a big problem, for months about the obfucation on Android, where some stuff related to FileProvider was missing.

The consequence, was that when i tried opening a file, the app just crashed without any warning or error in flutter.
Sometimes it didn't even report in Firebase.

Here the error message :
Fatal Exception: java.lang.IncompatibleClassChangeError: Class 'android.content.res.XmlBlock$Parser' does not implement interface 'n8.a' in call to 'int n8.a.next()' (declaration of 'androidx.core.content.FileProvider' appears in base.apk) at androidx.core.content.FileProvider.parsePathStrategy(FileProvider.java:19) at androidx.core.content.FileProvider.getPathStrategy(FileProvider.java:11) at androidx.core.content.FileProvider.getUriForFile(FileProvider.java:1) at com.crazecoder.openfile.utils.FileUtil.getFileUri(FileUtil.java:48) at com.crazecoder.openfile.OpenFilePlugin.startActivity(OpenFilePlugin.java:24)

After tons of trouble, and the help of Gemini, i found the rules for pro guards to make it work (i trieds tons of rules before, but here the one that work in my case)

-keep public class androidx.core.content.FileProvider { *; }
-keepnames class * implements android.os.Parcelable
-keepclassmembers class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *; }

-keep class android.content.res.XmlBlock { *; }
-keep class android.content.res.XmlBlock$Parser { *; }
-keep class org.xmlpull.** { *; }
-keep class android.content.res.XmlResourceParser { *; }

-keepclassmembers class **.R$xml {
   public static *;
}
-keep public class **.R$xml

[Hannnes1]

Thank you for that!
Those rules worked for me too, although I think the formatting got messed up when you posted.
This is what worked for me:

-keep public class androidx.core.content.FileProvider { *; }
-keepnames class * implements android.os.Parcelable
-keepclassmembers class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *; }

-keep class android.content.res.XmlBlock { *; }
-keep class android.content.res.XmlBlock$Parser { *; }
-keep class org.xmlpull.** { *; }
-keep class android.content.res.XmlResourceParser { *; }

-keepclassmembers class **.R$xml {
   public static *;
}
-keep public class **.R$xml

[Clemon-R]

You're right !
Thank for posting the good format !

[Clemon-R]

For those who want to know what happen, it's linked to the fact that too much packages doesn't use the same AndroidX Core version, so after Android obfuscation some part (like method or class) are considered 'not used/usefull' then will not be integrated to the project, so to avoid that we just don't obfuscate those parts, so the corresponding file can be found.