Proguard (R8) negate operator not working to keep anything except certain packages

Question

The negator (exclamation mark) in proguard should allow me to keep anthing but the apache libraries: ``` -keep class !org.apache.** ``` According to those answers. That's the way to go: - How to negate classname with Proguard - Enable Proguard for only two packages in large Android application - Android proguard Ignore All Classes except of one - Proguard Android do not obfuscate anything except few classes - Proguard: How to keep everything except specific condition? - Can we shrink all classes but only obfuscate some with proguard? However, it obfuscates all classes in my APK. That's part of my build.gradle (I have Android Studio 3.5.3) ``` compileSdkVersion 29 buildToolsVersion "29.0.2" //... buildTypes { release { minifyEnabled true proguardFiles /*getDefaultProguardFile('proguard-android.txt'),*/ 'proguard-rules.pro' // Enables resource shrinking, which is performed by the // Android Gradle plugin. shrinkResources false } } dependencies { //Utility libs implementation 'org.apache…

Accepted Answer

I had to add `,**` to get it working. Thanks T. Neidhart!

```
-keep class !org.apache.**,**
```

The previous example preserved class names but still obfuscated members. So I had to add `{ *; }`:

```
-keep class !org.apache.**,** { *; }
```

That's how I obfuscate multiple packages (I have to use them all in one keep rule!)

```
-keep class !org.apache.**, !org.zeroturnaround.**, !com.drew.**, ** { *; }
```

To find out what my problem is with `-dontshrink -dontoptimize -dontobfuscate -keep,allowshrinking,allowoptimization,allowobfuscation class org.apache.**` I could add `-whyareyoukeeping` according to https://www.guardsquare.com/en/products/proguard/manual/usage

Proguard (R8) negate operator not working to keep anything except certain packages

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