How to configure proguard to ONLY remove android logging calls

Question

I'm trying to configure proguard to ONLY remove calls to android.util.Log from my Android app (for the release build). I specifically don't want proguard to do any obfuscation or minification of the code.

This is the configuration I've tried but it doesn't remove the Log calls (I assume because of the -keep class **)

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-keepattributes Exceptions,InnerClasses,Signature,Deprecated,SourceFile,LineNumberTable,*Annotation*,EnclosingMethod

-keep class ** {
    *;
}

-assumenosideeffects class android.util.Log {
    *;
}

Is what I'm asking even possible with proguard?

Answer 1

You can remove logging calls with this option in proguard-project.txt:

-assumenosideeffects class android.util.Log {
    public static boolean isLoggable(java.lang.String, int);
    public static int v(...);
    public static int i(...);
    public static int w(...);
    public static int d(...);
    public static int e(...);
}

This option is only relevant if optimization is not disabled, like in proguard-android.txt. You have to specify proguard-android-optimize.txt instead, in project.properties:

proguard.config=${sdk.dir}/tools/proguard/proguard-android-optimize.txt:proguard-project.txt

You can disable shrinking and obfuscation if you wish. You can also preserve the internal API of your application from optimization if you wish:

-keep class myapp.** { *; }

Disabling these steps and keeping all code of course isn't optimal from a ProGuard point of view.

Answer 2

In build.gradle

buildTypes {

        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

---

In proguard-rules.pro

-dontwarn **
-target 1.7
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose

-optimizations !code/simplification/arithmetic,!code/allocation/variable
-keep class **
-keepclassmembers class *{*;}
-keepattributes *

#This will not remove error log
-assumenosideeffects class android.util.Log {
   public static boolean isLoggable(java.lang.String, int);
    public static int v(...);
    public static int i(...);
    public static int w(...);
    public static int d(...);
   #public static int e(...);
}