Proguard: can't find referenced class

Question

There are a few questions around but no solution that works for me. I thought it was suppose to be easy to use. I just get a console full of can't find referenced class

This is my proguard-project.txt

-injars      bin/classes
-injars      libs
-outjars     bin/classes-processed.jar
-libraryjars C:/Users/ME/android-sdks/platforms/android-10/android.jar

-dontpreverify
-repackageclasses ''
-allowaccessmodification
-optimizations !code/simplification/arithmetic
-keepattributes *Annotation*

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider

-keep public class * extends android.view.View {
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}

-keepclassmembers class * extends android.content.Context {
   public void *(android.view.View);
   public void *(android.view.MenuItem);
}

-keepclassmembers class * implements android.os.Parcelable {
    static android.os.Parcelable$Creator CREATOR;
}

-keepclassmembers class **.R$* {
    public static <fields>;
}

and project.properties

#Proguard enabled
proguard.config=C:/Users/ME/android-sdks/tools/proguard/proguard-android.txt:proguard-project.txt

some of the classes with warnings are:

org.apache.avalon.framework.logger.Logger
org.apache.log4j.Category
org.apache.log4j.Priority
org.apache.log4j.Logger
...
javax.servlet.ServletContextListener
javax.servlet.ServletContextEvent
org.w3c.dom.html.HTMLAnchorElement
org.w3c.dom.html.HTMLObjectElement
org.w3c.dom.html.HTMLTableSectionElement
org.w3c.dom.html.HTMLFrameSetElement
...
org.w3c.dom.events.DocumentEvent
org.w3c.dom.traversal.NodeFilter
...
org.w3c.dom.ranges.Range
org.w3c.dom.ranges.RangeException
...
org.w3c.dom.html.HTMLDocument

Answer 1

If you have an error such as:

Warning: com.package...: can't find referenced class com.secondpackage....Classname

Just add to your file proguard-android.txt:

#if it is class:
-keep class com.package.*{ *; }
#or if it is interface:
-keep interface com.package.*{ *; }
#or if it is a class that extends from any other
-keep class * extends com.example.Model
#or if you know only and of className
-keep class **Starter { *; }
#or if you want to keep only fields of classes
-keepclassmembers class com.package.** {
   *;
}

Also if you dont want to see all of notes in log use:

-dontnote com.package.**

This file name is written in build Gradle

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

Or if you want to add many files for example use the following repo And for add all of files:

 buildTypes {
        release {
            minifyEnabled true

            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            proguardFiles fileTree(include: ['*.pro'], dir: '../libraries').asList().toArray()
        }

libraries folder should be at D:\workspace\MyProject\libraries