Xamarin Android ProGuard Enable

Question

I am working on an xamarin application. When I turn on "ProGuard" in the android properties, when I create the application, I get the following error:

"java.exe" exited with code1. 

The proguard cfg file has the following:

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

Developing environment:
Visual studio 2015
Xamarin 4.0.4.4

Answer 1

I had the same issue when turning on ProGuard. Following the tips of this link , I fixed the problem by updating my proguard manually. The steps are pretty simple and they fixed the problem. Hope this helps you.

• Download the ProGuard zip file from https://sourceforge.net/projects/proguard/files/ . At the time of writing the latest version of ProGuard was 5.3.
• ProGuard does not have an installer, so you need to unzip the file and copy the proguard folder structure to the location specified in the following steps.
• Launch the SDK manager and note the path in the upper left corner of the menu. In my case, it was C: \ Users \ Sahar \ AppData \ Local \ Android \ android-sdk. The proguard folder is in the tools folder of this path (in my case it was C: \ Users \ Sahar \ AppData \ Local \ Android \ android-sdk \ tools \ proguard).
• Close all development environments that can access the SDK and rename the proguard folder to proguard.old.
• Copy the new version proguard folder to the tool folder and rename it to proguard if necessary (in my case, the copied folder was renamed from proguard5.3).
• Finally, copy the configuration files from the proguard.old folder to the new folder. In my case, these were: proguard-android.txt, proguard-android-optimize.txt and proguard-project.txt.
• Clean and rebuild your project with ProGuard enabled.

Answer 2

I had a problem when Proguard removed Google Play Services libraries from my application.

I had to add the following lines of text to the proguard-android.txt file found in this folder:

/(Path to your Android SDK Folder)/tools/proguard

 -keep public class com.google.android.gms.* { public *; } -dontwarn com.google.android.gms.** 

Full proguard-android.txt file

 -keep public class com.google.android.gms.* { public *; } -dontwarn com.google.android.gms.** # This is a configuration file for ProGuard. # http://proguard.sourceforge.net/index.html#manual/usage.html -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -verbose # Optimization is turned off by default. Dex does not like code run # through the ProGuard optimize and preverify steps (and performs some # of these optimizations on its own). -dontoptimize -dontpreverify # Note that if you want to enable optimization, you cannot just # include optimization flags in your own project configuration file; # instead you will need to point to the # "proguard-android-optimize.txt" file instead of this one from your # project.properties file. -keepattributes *Annotation* -keep public class com.google.vending.licensing.ILicensingService -keep public class com.android.vending.licensing.ILicensingService # For native methods, see http://proguard.sourceforge.net/manual/examples.html#native -keepclasseswithmembernames class * { native <methods>; } # keep setters in Views so that animations can still work. # see http://proguard.sourceforge.net/manual/examples.html#beans -keepclassmembers public class * extends android.view.View { void set*(***); *** get*(); } # We want to keep methods in Activity that could be used in the XML attribute onClick -keepclassmembers class * extends android.app.Activity { public void *(android.view.View); } # For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations -keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); } -keepclassmembers class * implements android.os.Parcelable { public static final android.os.Parcelable$Creator CREATOR; } -keepclassmembers class **.R$* { public static <fields>; } # The support library contains references to newer platform versions. # Don't warn about those in case this app is linking against an older # platform version. We know about them, and they are safe. -dontwarn android.support.** # Understand the @Keep support annotation. -keep class android.support.annotation.Keep -keep @android.support.annotation.Keep class * {*;} -keepclasseswithmembers class * { @android.support.annotation.Keep <methods>; } -keepclasseswithmembers class * { @android.support.annotation.Keep <fields>; } -keepclasseswithmembers class * { @android.support.annotation.Keep <init>(...); }