Xamarin Android ProGuard 启用

Question

我正在开发 xamarin 应用程序。当我在 android 属性中启用“ProGuard”时，在构建应用程序时，我收到以下错误：

"java.exe" exited with code1.

proguard cfg 文件有以下内容：

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

开发环境：
视觉工作室 2015
Xamarin 4.0.4.4

Answer 1

我在启用 ProGuard 时遇到了同样的问题。按照this link 上的建议，我通过手动更新我的proguard 解决了这个问题。这些步骤很容易遵循，他们解决了问题。希望对您有所帮助。

1. 从以下位置下载 ProGuard zip 文件：https://sourceforge.net/projects/proguard/files/。在撰写本文时，ProGuard 的最新版本是 5.3。
2. ProGuard 没有安装程序，因此您需要解压缩文件并将 proguard 文件夹结构复制到以下步骤中确定的位置。
3. 启动 SDK 管理器并记下左上角菜单选项下的路径。在我的情况下，这是 C:\Users\Sahar\AppData\Local\Android\android-sdk。 proguard 文件夹位于该路径的 tools 文件夹中（在我的例子中是 C:\Users\Sahar\AppData\Local\Android\android-sdk\tools\proguard）。
4. 关闭所有可能正在访问 SDK 的开发环境，并将 proguard 文件夹重命名为 proguard.old。
5. 将新版本的 proguard 文件夹复制到 tools 文件夹中，必要时将其重命名为 proguard（在我的例子中，复制的文件夹是从 proguard5.3 重命名的）。
6. 最后将配置文件从 proguard.old 文件夹复制到新文件夹。就我而言，这些是：- proguard-android.txt、proguard-android-optimize.txt 和 proguard-project.txt。
7. 在启用 ProGuard 的情况下清理并重建您的项目。

Answer 2

Proguard 从我的应用程序中删除 Google Play 服务库时遇到问题。

我必须将以下文本行添加到此文件夹中的 proguard-android.txt 文件中：

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

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

完成proguard-android.txt文件

-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>(...);
}