为代码分发生成一个混淆的 JAR

Question

我正在开发一个 Android 库项目。我想将此库作为 JAR 分发给其他开发人员。在分发 JAR 之前，我想对其进行混淆。我曾尝试为此目的使用 PROGUARD，但它在最后一步失败并说

The output jar is empty. Did you specify the proper '-keep' options?

谁能指出出了什么问题？

=================编辑：错误日志=======================

ProGuard, version 4.7
Reading program jar [C:\Users\XYZ\Downloads\login.jar]
Reading library jar [D:\Softwares\Android SDK\adt-bundle-windows-x86-20130522\sdk\platforms\android-8\android.jar]
Note: the configuration refers to the unknown class 'javax.swing.plaf.ComponentUI'
Note: the configuration refers to the unknown class 'javax.swing.plaf.ComponentUI'
Note: the configuration refers to the unknown class 'javax.swing.JComponent'
Note: there were 3 references to unknown classes.
You should check your configuration for typos.
The output jar is empty. Did you specify the proper '-keep' options?

=============== 编辑：proguard.cfg =====================

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-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.app.backup.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

-keep public class MyClass extends MyView {

public static String GetSessionID () {
    }
}

-keepclasseswithmembernames class * {
   native <methods>;
}

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

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

-keepclassmembers enum * {
   public static **[] values();
   public static ** valueOf(java.lang.String);
}

-keep class * implements android.os.Parcelable {
   public static final android.os.Parcelable$Creator *;
}

Answer 1

在您的 proguard 文件中添加这一行。

 -keep class <your jar file name>.** { *; }