Develop Reference

ProGuard - Obfuscate and Shrink "app" module only?

I am trying to use ProGuard first time to obfuscate only "app" module of my project. But i either face problems generating apk or the generated apk simply crash the app.
I have already tried following ProGuard rule:
-keep class !com.example.mypackage.**{ *; }
But it generates following error:
Warning:library class android.content.res.XmlResourceParser extends or
implements program class org.xmlpull.v1.XmlPullParser
So i want to know if i can just obfuscate and shrink only single module without using any other functionality.

The rule itself will not create this warning. It looks like you included something as compile dependency that contains the XmlPullParser class which is already present in the Android SDK jar.
This warnings is usually harmless and can be ignored by adding -ignorewarnings to your ProGuard configuration, but I would check all your dependencies and investigate where this class is included from.

Android ProGuard obfuscation of library: keep class not working

Intro: I have in AS 1 project with 2 models:
Android library project with some "Public API class"
Android APP dependent on above library (the library module is on the dependency list)
Task: I want to obfuscate my library project because I want to expose it as public SDK but keep my code protected...
What I did: So I made custom ProGuard rules:
-dontshrink
-dontoptimize
-dontpreverify
-keep class com.org.my_public_api_class_name
I skip all other stages in order to eliminate where the bug is to only obfuscation stage.
Result: Build of the APP module fails with errors like
Error: cannot find symbol class my_public_api_class_name
It seems for me that the problem is that the obfuscation NOT skipped the class I wanted to, so now he has some meaningless name and therefore in the APP, where I'm using him, The original name not exist.
Thanks,

To exclude your class from obfuscation, try this:
-keep class com.org.my_public_api_class_name**
-keepclassmembers class com.org.my_public_api_class_name** {*;}

Note: android.support.v4.text.ICUCompatIcs: can't find dynamically referenced class libcore.icu.ICU

I started getting the message with the latest Android Build Tools (ABT) v19.0.3 today. At first glance, I thought this might be an issue with ABT. However, a closer investigation reveals that this message:
android.support.v4.text.ICUCompatIcs: can't find dynamically referenced class libcore.icu.ICU
is only shown when Proguard is used. Answers on the net has yeilded no solution for me. Perhaps, this is only an issue with Proguard (the version I'm using is bundled with Android SDK v22.3).
I have added the following directives to proguard-project.txt file, but it makes no difference:
-keep interface android.support.v4.** { *; }
-keep class android.support.v4.** { *; }
Does anyone else come across this message and has a possible solution? Maybe Eric from Proguard might be able to shed some light into this issue. Maybe a code cleanup is required with Proguard? I'm interested to know the solution.

The note says that a support class is using reflection to access a runtime class that isn't present in the target runtime. In general, it could be a sign of compatibility problems. In this case, it's harmless; the developers of the support library are precisely using reflection to avoid any linking problems with different runtime environments. You can suppress the note with:
-dontnote android.support.**

Proguard + RenderScript support library error

I have a project that is using the new RenderScript support library and is also using proguard for obfuscation.
Proguard was working great on the code when using the normal RenderScript SDK (android.renderscript.*). And the code is working great with the RenderScript support library when compiled in a non-release build where proguard does not run.
But, bring the two together and the result is this:
Warning: android.support.v8.renderscript.RenderScript: can't find referenced class android.os.SystemProperties
Warning: android.support.v8.renderscript.RenderScript: can't find referenced class android.os.SystemProperties
Warning: android.support.v8.renderscript.RenderScriptThunker: can't find referenced method 'android.renderscript.RenderScript create(android.content.Context,int)' in class android.renderscript.RenderScript
You should check if you need to specify additional program jars.
Warning: there were 2 unresolved references to classes or interfaces.
You may need to specify additional library jars (using '-libraryjars').
Warning: there were 1 unresolved references to program class members.
Your input classes appear to be inconsistent.
You may need to recompile them and try again.
Alternatively, you may have to specify the option
'-dontskipnonpubliclibraryclassmembers'.
I know just enough about proguard to be dangerous. One thing I have learned is that the suggestions in the warning/error messages tend not to necessarily point at the actual cause of the issue. This time is no different: implementing the suggested changes in the warnings results in no change of the output.
Can the RenderScript support library be used with proguard? And if so, is there some magic that I need to add to my proguard config to make it work?

-dontwarn android.support.v8.**
actually encountered this yesterday...

For androidX
-keep class androidx.renderscript.** { *; }

Combining the previous two ansers, in any modern app that uses Renderscript, you should add the follwing to your proguard-rules.pro file.
# Render Script
-keep class android.support.v8.renderscript.** { *; }
-keep class androidx.renderscript.** { *; }
This will take care of both apps that use the Android support library, or Android X

Problems compiling an Android App with Ant and Proguard

I have an Android App which consists on different modules. The Main module is using some libs like Google's GSON or the v4.support.package. A custom build script with the right proguard.cfg will build it, too.
Now I must integrate another "Android-Library" which uses partly the same libs (GSON support.v4). Beside from getting a lot of Notes like
Note: duplicate definition of program class [com.google.gson.Gson]
I get also some Notes like
[proguard] Note: com.google.gson.UnsafeAllocator: can't find dynamically referenced class sun.misc.Unsafe
[proguard] Note: the configuration refers to the unknown class 'sun.misc.Unsafe'
that I find strange cause i have some 'keeps' in my Proguard.cfg especially for that:
-keepattributes Signature, Annotation
-keep class com.google.gson.** {*;}
-keep class sun.misc.Unsafe { *; }
which works well on my project without referencing the module-library inside it.
I'm on the Latest SDK and Tools, and added a custom proguard.cfg to the module-library, which works well on the module-lib itself (if build in standalone-mode).
It seems to me, that the build is not depending on custom proguard.cfg inside library-projects. Any idea on what to try highly appreciated

I finally found a solution for it myself:
with the last Android Tools (16), every Android-Library gets compiled on its own first.
So when the lib has not a "standart" build and defines some custom build script including proguard --keeps, and this --keeps are defined on the same Project (excluding Android SDK classes, as thei're not compiled) it leads to an proguard error.
The Solution was do remove proguard out of the lib and copy the --keeps inside the main App