我已经编写了一个Android应用程序，我想使用Proguard生成一个Apk，然后我想混淆代码。我使用 Android Studio 3。
在我的build.gradle中，我有：
buildTypes {
release {
shrinkResources true
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
我知道Proguard配置在"proguard-android.txt"和"proguard-rules.pro"中。 一开始我在构建过程中遇到了错误，我用"proguard-rules.pro"解决了它们，并添加了一些行：
-dontwarn org.**
-dontwarn com.**
-dontwarn java.**
-dontwarn javax.**
-dontwarn sun.**
之后，建筑物就可以了，但是当我在设备中运行时，由于混淆而出现错误; 我得到的前两个是：
E/dalvikvm: Could not find class 'android.hardware.display.DisplayManager', referenced from method l.a.i.aX
E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
然后，经过一些日志，我得到
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NoSuchFieldError: UNKNOWN
at java.lang.reflect.Method.getDefaultValue(Native Method)
at java.lang.reflect.Method.getDefaultValue(Method.java:362)
at org.apache.harmony.lang.annotation.AnnotationFactory.getElementsDescription(AnnotationFactory.java:75)
at org.apache.harmony.lang.annotation.AnnotationFactory.<init>(AnnotationFactory.java:115)
at org.apache.harmony.lang.annotation.AnnotationFactory.createAnnotation(AnnotationFactory.java:97)
at java.lang.reflect.Field.getAnnotation(Native Method)
at java.lang.reflect.Field.getAnnotation(Field.java:212)
at com.a.a.d.f.a(Unknown Source)
at com.a.a.a.e.a(Unknown Source)
at com.a.a.a.e.a(Unknown Source)
然后应用终止。
为了解决我尝试的第一个错误：
-keep class android.** { *; }
但它不起作用...
有人可以帮忙吗？
在"proguard-android.txt"(由Android STudio构建...)中我有：
-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>(...);
}
我在"proguard-rules.pro"中使用以下文本解决了：
## ________________________________________________________________________________________________________________
-dontwarn org.**
-dontwarn com.**
-dontwarn java.**
-dontwarn javax.**
-dontwarn sun.**
## ________________________________________________________________________________________________________________
-keep class android.** { *; }
-keep class org.** { *; }
-keep class java.** { *; }
-keep class javax.** { *; }
-keep class sun.** { *; }
-keep class de.mindpipe.** { *; }
-keep class com.j256.** { *; }
## ________________________________________________________________________________________________________________
## Preserve line numbers in the obfuscated stack traces.
-keepattributes LineNumberTable
-keepattributes SourceFile