使用 Proguard 在 res/raw 中使用 XML 文件时出现 NullPointerException

Question

我在我的应用程序中使用了simple XML serializer，并且似乎已通过在 proguard.cfg 中使用以下行成功地将其从 Proguard 混淆中排除，这要感谢SO question：

-keep public class org.simpleframework.**{ *; } 
-keep class org.simpleframework.xml.**{ *; } 
-keep class org.simpleframework.xml.core.**{ *; } 
-keep class org.simpleframework.xml.util.**{ *; } 

我能够签署和导出 apk，但是当我尝试运行我的应用程序时，它在尝试访问 res/raw 目录 (R.raw.home_screen_menu) 中的 XML 文件时崩溃并出现 NullPointerException。

我将 R.java 排除在外：

-keepclassmembers class **.R$* {
    public static <fields>;
}

我整天都在玩这个配置文件，但没有任何运气。有没有人遇到过这个问题或类似的问题？我尝试的最新方法是使用如下所示的“adaptresource”选项：

-adaptresourcefilenames    **.xml
-adaptresourcefilecontents **.xml

供参考，这里是我的proguard.cfg的内容：

#Use 5 step of optimization 
-optimizationpasses 5

#When not preverifing in a case-insensitive filing system, such as Windows. This tool will unpack your processed jars,(if using windows you should then use):
-dontusemixedcaseclassnames

#Specifies not to ignore non-public library classes. As of version 4.5, this is the default setting
-dontskipnonpubliclibraryclasses

#Preverification is irrelevant for the dex compiler and the Dalvik VM, so we can switch it off with the -dontpreverify option.
-dontpreverify

#Specifies to write out some more information during processing. If the program terminates with an exception, this option will print out the entire stack trace, instead of just the exception message.
-verbose

#The -optimizations option disables some arithmetic simplifications that Dalvik 1.0 and 1.5 can't handle. Note that the Dalvik VM also can't handle aggressive overloading (of static fields).
#To understand or change this check http://proguard.sourceforge.net/index.html#/manual/optimizations.html
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-dump ../bin/class_files.txt
-printseeds ../bin/seeds.txt
-printusage ../bin/unused.txt
-printmapping ../bin/mapping.txt 

-dontskipnonpubliclibraryclassmembers

#Ignore warnings for roboguice.activity.RoboAccountAuthenticatorActivity
-dontwarn roboguice.activity.RoboAccountAuthenticatorActivity

-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 class com.google.inject.Binder

# Keep annotations
-keepattributes *Annotation*
-keepattributes Signature

#To remove debug logs:
-assumenosideeffects class android.util.Log {
    public static *** d(...);
    public static *** v(...);
    public static *** w(...);
}

# Roboguice
-keepclassmembers class * {
    @com.google.inject.Inject <init>(...);
}

# SimpleXML
-keep public class org.simpleframework.**{ *; } 
-keep class org.simpleframework.xml.**{ *; } 
-keep class org.simpleframework.xml.core.**{ *; } 
-keep class org.simpleframework.xml.util.**{ *; } 
-dontwarn javax.xml.stream.**
-dontwarn javax.xml.namespace.**

-keep public class roboguice.**

# There's no way to keep all @Observes methods, so use the On*Event convention to identify event handlers
-keepclassmembers class * { 
    void *(**On*Event); 
}

-keep public class * extends android.view.View {
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);
}

-keepclasseswithmembers class * {
    native <methods>;
}

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

-keepclasseswithmembers 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 *;
}

-keepclassmembers class * implements android.os.Parcelable {
    static android.os.Parcelable$Creator CREATOR;
}

-keepclassmembers class **.R$* {
    public static <fields>;
}

Answer 1

我也有同样的问题。最后我解决了这个问题和答案。我把最后的配置留在这里：

build.gradle：

buildTypes {
    release {
        minifyEnabled true
        shrinkResources true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

dependencies {
    compile('org.simpleframework:simple-xml:2.7.1') {
        exclude module: 'stax'
        exclude module: 'stax-api'
        exclude module: 'xpp3'
    }
}

proguard-rules.pro（添加到默认的 proguard 配置）

-dontwarn javax.xml.**

-keep public class org.simpleframework.**{ *; }
-keep class org.simpleframework.xml.**{ *; }
-keep class org.simpleframework.xml.core.**{ *; }
-keep class org.simpleframework.xml.util.**{ *; }

-keepattributes Signature
-keepattributes *Annotation*

# Ignore our XML Serialization classes
-keep public class your.annotated.pojo.models.*{
  public protected private *;
}

希望对某人有所帮助

Answer 2

原来原始文件被单独留下并且没问题。问题是我的类用于带有简单 XML 序列化器注释的序列化。我在我的应用程序中添加了日志语句，并在违规行发现了这个错误：“属性 'id' 在第 2 行的类 com.xxx.ListViewItems 中没有匹配项”。这让我意识到私有的“id”变量被混淆了，Simple XML 序列化程序无法识别。这是 ListViewItems.java 中的代码：

@Attribute(required=false)
private String id;  // This was being obfuscated and thus unrecognizable!

这是我添加到 Proguard 以完全跳过混淆类的内容（可能有更好的方法）：

# Ignore our XML Serialization classes
-keep public class com.xxx.ListViewItems {
  public protected private *;
}