Removing Log call using proguard

Question

I am trying to use proguard to strip all my logs: I have entered the following line in my proguard-project.txt:

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

And my project.properties looks like this:

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

Inspite of this the logs continue to show in my application. What exactly am I doing wrong here?

Answer 1

You shouldn't specify the '*' wildcard, because that includes methods like 'Object#wait()'. Better explicitly list the methods:

-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:

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

or with the contemporary Android Gradle plugin

buildTypes {
    releaseSomeBuildType {
        ...
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'your-proguard-file.pro'
    }
}   

Answer 2

It's pretty late and I came across the same problem. I am using Android studio 1.3 and this is what I did.

1. Add the log methods that you want to strip in your release build in proguard-android-optimize.txt:

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

2. In your build.gradle (Module: app) set proguard-android-optimize.txt as default proguard file instead of proguard-android.txt:

   buildTypes {
       release {
           minifyEnabled true
           debuggable false
           proguardFiles getDefaultProguardFile('proguard-android-optimize.txt')
       }
   }
   

This is because in proguard-android.txt optimization is turned off by default with flags

-dontoptimize
-dontpreverify 

This worked for me, hope it helps others.

Answer 3

You need to do it like this:

-assumenosideeffects class android.util.Log {
public static int d(...);
public static int v(...);
public static int i(...);
public static int w(...);
public static int e(...);
public static int wtf(...);
    }

and expand for all the log methods you are using.