ProGuard for Android的新文档说要在项目主目录的 default.properties 文件中添加一行。但是，在打开此文件时，我在顶部阅读：
# This file is automatically generated by Android Tools.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
我错过了什么吗？
另外，有没有办法只为来自 Eclipse 的生产构建启用 ProGuard（即，在导出成品时）？
Android SDK（r20 或更高版本）
请检查 project.properties 中引用的预定义 proguard.config
proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt
更多信息： http: //proguard.sourceforge.net/manual/examples.html#androidapplication
在 Gradle 上：
buildTypes {
release {
minifyEnabled true
shrinkResources true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
...
}
}
在这里您可以查看我不断更新的 proguard“默认”文件：https ://medium.com/code-procedure-and-rants/android-my-standard-proguard-ffeceaf65521
Android SDK（r19 或更低版本）
您可以将其添加到 default.properties。到目前为止，我一直在手动添加而没有问题。
如果添加该行：
proguard.config=proguard.cfg
如前所述，它只会在导出签名应用程序时使用 ProGuard（Android 工具 => 导出签名应用程序）
如果您使用 Android 2.3 之前的 SDK 启动项目，proguard.cfg则不会创建该文件（default.properties在 2.3> 旁边）。
要启用它的自动创建，只需简单地更新到 Android 2.3 的 SDK 并使用现有源（这是您当前拥有的项目的源）创建一个新项目。
proguard.cfg将自动创建填充。
如果仍然如此，您想手动创建它，这就是它应该包含的内容：
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontwarn android.support.**
-verbose
-dontoptimize
-dontpreverify
-keepattributes *Annotation*
-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 com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService
-keep public class * extends android.support.v4.app.Fragment
-keep public class * extends android.app.Fragment
-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 public class * extends android.view.View {
void set*(***);
*** get*();
}
-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 **.R$* {
public static <fields>;
}
我想我已经回答了上面所有的问题。
更新：
逐行解释：
#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
# 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
-dontwarn android.support.**
#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/*
# 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.
#To repackage classes on a single package
#-repackageclasses ''
#Uncomment if using annotations to keep them.
#-keepattributes *Annotation*
#Keep classes that are referenced on the AndroidManifest
-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.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService
#Compatibility library
-keep public class * extends android.support.v4.app.Fragment
-keep public class * extends android.app.Fragment
#To maintain custom components names that are used on layouts XML.
#Uncomment if having any problem with the approach below
#-keep public class custom.components.package.and.name.**
# 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*();
}
#To remove debug logs:
-assumenosideeffects class android.util.Log {
public static *** d(...);
public static *** v(...);
public static *** w(...);
}
#To avoid changing names of methods invoked on layout's onClick.
# Uncomment and add specific method names if using onClick on layouts
#-keepclassmembers class * {
# public void onClickButton(android.view.View);
#}
#Maintain java native methods
-keepclasseswithmembernames class * {
native <methods>;
}
#To maintain custom components names that are used on layouts XML:
-keep public class * extends android.view.View {
public <init>(android.content.Context);
}
-keep public class * extends android.view.View {
public <init>(android.content.Context, android.util.AttributeSet);
}
-keep public class * extends android.view.View {
public <init>(android.content.Context, android.util.AttributeSet, int);
}
#Maintain enums
-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
#To keep parcelable classes (to serialize - deserialize objects to sent through Intents)
-keep class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}
#Keep the R
-keepclassmembers class **.R$* {
public static <fields>;
}
###### ADDITIONAL OPTIONS NOT USED NORMALLY
#To keep callback calls. Uncomment if using any
#http://proguard.sourceforge.net/index.html#/manual/examples.html#callback
#-keep class mypackage.MyCallbackClass {
# void myCallbackMethod(java.lang.String);
#}
#Uncomment if using Serializable
#-keepclassmembers class * implements java.io.Serializable {
# private static final java.io.ObjectStreamField[] serialPersistentFields;
# private void writeObject(java.io.ObjectOutputStream);
# private void readObject(java.io.ObjectInputStream);
# java.lang.Object writeReplace();
# java.lang.Object readResolve();
#}
更新 2：
在最近的 ADT/Proguard 中使用-keepclasseswithmembers而不是-keepclasseswithmembernames
只是一个跟进，因为我正在寻找同样的东西 - 这里的答案已经过时 - 最近基本的 proguard 配置在 sdk 目录中 - 所以你只需要将它放入你的 project.properties 中：
proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt
如果要进行特定于项目的修改，请创建一个 proguard-project.txt 并将该行更改为：
proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
至少从 ADT 16 开始，您确实可以在 中添加该行project.properties，它将被保留。您可以尝试更改目标 SDK 版本，并查看project.properties相应更新，但添加的行仍然存在。所以，我认为警告只是措辞不当；这意味着文件中的设置target将被项目设置覆盖，而不是反之亦然。
ADT 版本 17 对 ProGuard 配置进行了更改。ProGuard 从 4.4 更新到 4.7，并引入了配置文件参考中的差异。请注意，现有项目将保持不变，使它们没有包含在此和较新 ADT 版本中的较新规则集。上面ligi已经指出的更新配置安排的相关文档可在以下位置获得：-
http://tools.android.com/recent/proguardimprovements “其次，我们改变了配置文件的处理方式。”
您可以将该行添加到 中build.properties，如 中所述default.properties。