此问题仅发生在Android 5中。应用程序崩溃写入该点，我创建了一个新的DateTime对象，如：
mStartTime = new DateTime(DateTimeZone.getDefault());
崩溃报告是：
java.lang.AbstractMethodError: abstract method "long boq.f()"
at org.joda.time.chrono.BasicYearDateTimeField.(BasicYearDateTimeField.java:46)
at org.joda.time.chrono.BasicChronology.assemble(BasicChronology.java:273)
at org.joda.time.chrono.GregorianChronology.assemble(GregorianChronology.java:197)
at org.joda.time.chrono.AssembledChronology.setFields(AssembledChronology.java:323)
at org.joda.time.chrono.AssembledChronology.(AssembledChronology.java:102)
at org.joda.time.chrono.BasicChronology.(BasicChronology.java:131)
at org.joda.time.chrono.BasicGJChronology.(BasicGJChronology.java:75)
at org.joda.time.chrono.GregorianChronology.(GregorianChronology.java:153)
at org.joda.time.chrono.GregorianChronology.getInstance(GregorianChronology.java:133)
at org.joda.time.chrono.GregorianChronology.getInstance(GregorianChronology.java:99)
at org.joda.time.chrono.GregorianChronology.(GregorianChronology.java:70)
at org.joda.time.chrono.GregorianChronology.getInstanceUTC(GregorianChronology.java:80)
at org.joda.time.chrono.ISOChronology.(ISOChronology.java:59)
at org.joda.time.base.BaseDateTime.(BaseDateTime.java:73)
at org.joda.time.DateTime.(DateTime.java:184)
at com.znapo.photo_sharer.asynctasks.GetAllSessionTask.onPostExecute(GetAllSessionTask.java:149)
at com.znapo.photo_sharer.asynctasks.GetAllSessionTask.onPostExecute(GetAllSessionTask.java:1)
at android.os.AsyncTask.finish(AsyncTask.java:636)
at android.os.AsyncTask.access$500(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
我的完整Proguard配置文件是：
-dontwarn org.apache.**
-dontwarn com.google.android.**
-dontskipnonpubliclibraryclassmembers
##---------------Begin: proguard configuration common for all Android apps ----------
-optimizationpasses 5
-dontpreverify
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-allowaccessmodification
-keepattributes *Annotation*
-keepattributes SourceFile,LineNumberTable
-repackageclasses ''
-keep public class * extends android.app.Activity
#-keep public class * extends android.support.v7.app.ActionBarActivity
-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
-dontnote com.android.vending.licensing.ILicensingService
# Explicitly preserve all serialization members. The Serializable interface
# is only a marker interface, so it wouldn't save them.
-keepclassmembers class * implements java.io.Serializable {
static final long serialVersionUID;
private static final java.io.ObjectStreamField[] serialPersistentFields;
private void writeObject(java.io.ObjectOutputStream);
private void readObject(java.io.ObjectInputStream);
java.lang.Object writeReplace();
java.lang.Object readResolve();
}
# Preserve all native method names and the names of their classes.
-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);
}
# Preserve static fields of inner classes of R classes that might be accessed
# through introspection.
-keepclassmembers class **.R$* {
public static <fields>;
}
# Preserve the special static methods that are required in all enumeration classes.
-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
-keep public class * {
public protected *;
}
-keep class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}
##---------------End: proguard configuration common for all Android apps ----------
#for support library
-keep class android.support.v7.** { *; }
-keep interface android.support.v7.** { *; }
-keep class android.support.v4.** { *; }
-keep class android.support.v13.** { *; }
-keep interface android.support.v4.** { *; }
-keep interface android.support.v13.** { *; }
#for retracing obfuscated stack traces
-keepattributes SourceFile,LineNumberTable
##---------------Begin: proguard configuration for Gson ----------
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature
# For using GSON @Expose annotation
-keepattributes *Annotation*
# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }
# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }
-keep class com.tweetstudio.tweet_studio_app.dto.** { *; }
##---------------End: proguard configuration for Gson ----------
##--------For Google Play services-------------##
-keep class * extends java.util.ListResourceBundle {
protected Object[][] getContents();
}
-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
public static final *** NULL;
}
-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
@com.google.android.gms.common.annotation.KeepName *;
}
-keepnames class * implements android.os.Parcelable {
public static final ** CREATOR;
}
##---------- End: proguard configuration for google play ---------------
##---------- proguard configuration for joda-time ---------------
-dontwarn org.joda.convert.**
-dontwarn javax.xml.bind.DatatypeConverter
将以下jar添加到Joda-Time的构建路径中：
joda-time-2.7.jar
joda-convert-1.7.jar
joda-time-2.7-javadoc.jar
将joda-convert-2.7.jar转换为zip并探索BasicYearDateTimeField的第46行后，我看到了这行代码：
super(DateTimeFieldType.year(), chronology.getAverageMillisPerYear());
答案 0 :(得分：4)
您可以添加以下行： -
-keep class org.joda.** { *; }
到你的proguard配置。这将阻止joda库中的代码被删除。添加此行仅为我增加了2.99 KB的apk大小。
答案 1 :(得分：1)
你可以使用这个github Joda-Time Library Git Hub Joda Time
答案 2 :(得分：0)
也许看一些文档会有所启发：
当应用程序尝试调用抽象方法时抛出。通常，编译器会捕获此错误;如果自上次编译当前正在执行的方法以来某些类的定义发生了不兼容的更改，则此错误只能在运行时发生。
承诺“long boq.f（）”将被实施并且它撒了谎。如果没有重新编译应该重新编译的内容，那么应该只能在运行时进行。
我会编写一个简单的独立程序，使用joda-time和new DateTime(DateTimeZone.getDefault());查看问题是否易于重现。如果是你已经将问题隔离到那个版本的joda-time。看看是否回滚到较旧版本会使问题消失。
你也可以重新推荐joda-time和任何与joda-time谈话的事情。这样做至少应该将此运行时错误转换为编译时错误。这应该可以很容易地看出出了什么问题。