Google Drive API无法与ProGuard(NPE)配合使用

Question

目前,我有经验,使用Google Drive API的一段代码在没有引入ProGuard的情况下运行正常.

但是,在引入ProGuard之后,我遇到了以下运行时错误.

    at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.NullPointerException
    at com.google.api.client.util.Types.getActualParameterAtPosition(Types.java:329)
    at com.google.api.client.util.Types.getIterableParameter(Types.java:309)
    at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:546)
    at com.google.api.client.json.JsonParser.parse(JsonParser.java:350)
    at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:586)
    at com.google.api.client.json.JsonParser.parse(JsonParser.java:289)
    at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:76)
    at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:71)
    at com.google.api.client.http.HttpResponse.parseAs(HttpResponse.java:491)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:456)
    at com.jstock.c.b.a(CloudFile.java:136)

请注意,崩溃发生在我的代码中(如果我使用mapping.txt进行回溯,则为com.jstock.cba)

// request is Files.List
FileList files = request.execute();

在我的项目中,我认为有以下两个关键指令,能够防止崩溃发生:我告诉ProGuard永远不要触及jackson和Google库.

-keep class org.codehaus.** { *; }
-keep class com.google.** { *; }
-keep interface org.codehaus.** { *; }
-keep interface com.google.** { *; }

但这不起作用.NPE仍然发生在Types.java上

请注意,我还有另一种尝试是,我认为混淆过程会导致NPE发生.因此,我尝试使用它来禁用它-dontobfuscate.但这一次,我将无法生成APK文件,并得到一个流行的错误消息:转换为Dalvik格式失败,错误1

以下是在Google Drive API中导致NPE的proguard配置.

-optimizationpasses 1
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

# Comment out the following line, will cause popular "Conversion to Dalvik format failed with error 1"
##-dontobfuscate

-dontwarn sun.misc.Unsafe
-dontwarn com.google.common.collect.MinMaxPriorityQueue
-dontwarn javax.swing.**
-dontwarn java.awt.**
-dontwarn org.jasypt.encryption.pbe.**
-dontwarn java.beans.**
-dontwarn org.joda.time.**
-dontwarn com.google.android.gms.**
-dontwarn org.w3c.dom.bootstrap.**
-dontwarn com.ibm.icu.text.**
-dontwarn demo.**

# Hold onto the mapping.text file, it can be used to unobfuscate stack traces in the developer console using the retrace tool
-printmapping mapping.txt

# Keep line numbers so they appear in the stack trace of the develeper console 
-keepattributes *Annotation*,EnclosingMethod,SourceFile,LineNumberTable

-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 android.support.v4.app.** { *; }
-keep interface android.support.v4.app.** { *; }
-keep class com.actionbarsherlock.** { *; }
-keep interface com.actionbarsherlock.** { *; }

# https://sourceforge.net/p/proguard/discussion/182456/thread/e4d73acf
-keep class org.codehaus.** { *; }
-keep class com.google.** { *; }
-keep interface org.codehaus.** { *; }
-keep interface com.google.** { *; }

-assumenosideeffects class android.util.Log {
  public static int d(...);
  public static int i(...);
  public static int e(...);
  public static int v(...);  
}

-keepclasseswithmembernames 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 class * extends android.app.Activity {
   public void *(android.view.View);
}

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

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

-assumenosideeffects class android.util.Log {
    public static *** d(...);
    public static *** v(...);
    public static *** i(...);
}

-keepclasseswithmembers class com.google.common.base.internal.Finalizer{
    <methods>;
}

还有什么我可以尝试的吗？

我不确定它可能是由库的组合引起的.(虽然在不引入ProGuard的情况下运行良好)

如果我查看NPE崩溃位置(Types.getActualParameterAtPosition(Types.java:329))

private static Type getActualParameterAtPosition(Type type, Class<?> superClass, int position) {
    ParameterizedType parameterizedType = Types.getSuperParameterizedType(type, superClass);
    Type valueType = parameterizedType.getActualTypeArguments()[position];
    // this is normally a type variable, except in the case where the class of iterableType is
    // superClass, e.g. Iterable<String>
    if (valueType instanceof TypeVariable<?>) {
      Type resolve = Types.resolveTypeVariable(Arrays.asList(type), (TypeVariable<?>) valueType);
      if (resolve != null) {
        return resolve;
      }
    }
    return valueType;
}

我怀疑Types.getSuperParameterizedType回来了null.所以,我进一步研究Types.getSuperParameterizedType.

public static ParameterizedType getSuperParameterizedType(Type type, Class<?> superClass) {
    if (type instanceof Class<?> || type instanceof ParameterizedType) {
    outer: while (type != null && type != Object.class) {
     Class<?> rawType;
     if (type instanceof Class<?>) {
       // type is a class
       rawType = (Class<?>) type;
     } else {
       // current is a parameterized type
       ParameterizedType parameterizedType = (ParameterizedType) type;
       rawType = getRawClass(parameterizedType);
       // check if found Collection
       if (rawType == superClass) {
         // return the actual collection parameter
         return parameterizedType;
       }
       if (superClass.isInterface()) {
         for (Type interfaceType : rawType.getGenericInterfaces()) {
           // interface type is class or parameterized type
           Class<?> interfaceClass =
               interfaceType instanceof Class<?> ? (Class<?>) interfaceType : getRawClass(
                   (ParameterizedType) interfaceType);
           if (superClass.isAssignableFrom(interfaceClass)) {
             type = interfaceType;
             continue outer;
           }
         }
       }
     }
     // move on to the super class
     type = rawType.getGenericSuperclass();
    }
    }
    return null;
}

在ProGuard处理getSuperParameterizedType后null,可能导致返回的可能根本原因是什么？

Answer 1

以下组合对我有用:

-keep class com.google.** { *;}
-keep interface com.google.** { *;}
-dontwarn com.google.**

-dontwarn sun.misc.Unsafe
-dontwarn com.google.common.collect.MinMaxPriorityQueue
-keepattributes *Annotation*,Signature
-keep class * extends com.google.api.client.json.GenericJson {
*;
}
-keep class com.google.api.services.drive.** {
*;
}

这为最近的Google云端硬盘项目提供了兼容的工作程序.

不能采取尽管所有功劳这一解决方案,最初发现这个链接点击这里

Answer 2

适当的组合是:

-keepattributes Signature,RuntimeVisibleAnnotations,AnnotationDefault

Google为项目google-api-java-client准备了proguard配置

https://github.com/google/google-api-java-client/blob/57fe35766cbba0a0d5a9a296be81468d730a29f8/google-api-client-assembly/proguard-google-api-client.txt