在将Android Studio更新为2.2版并将Android Gradle插件更新为2.2.0之后,在构建发行版apk时会有很多警告,例如:
Error:warning: Ignoring InnerClasses attribute for an anonymous inner class
Error:(android.support.graphics.drawable.b) that doesn’t come with an
Error:associated EnclosingMethod attribute. This class was probably produced by a
Error:compiler that did not target the modern .class file format. The recommended
Error:solution is to recompile the class from source, using an up-to-date compiler
Error:and without specifying any “-target” type options. The consequence of ignoring
Error:this warning is that reflective operations on this class will incorrectly
Error:indicate that it is not an inner class.
此外,我的发行版APK大小已增加.因此,我使用dex2jar工具将其转换为jar,并与以前的版本(使用com.android.tools.build:gradle:2.1.3构建)进行了比较.我注意到的第一件事是新版本仍然具有一些内部类,而以前的版本中没有.
然后,我在我的proguard配置中添加了-keepattributes EnclosingMethod以避免警告,但是通过现在保留所有内部类,它大大增加了文件大小.
那么,是否可以像在Android Gradle插件2.1.3中那样,在没有不必要的内部类和-keepattributes EnclosingMethod的情况下构建apk?
ProGuard配置:
# Retrolambda
-dontwarn java.lang.invoke.*
# okhttp
-dontwarn okio.**
-dontwarn okhttp3.**
-keep class okio.**
-keep class okhttp3.** { *; }
-keep interface okhttp3.** { *; }
# appcompat
-keep public class android.support.v7.widget.** { *; }
-keep public class android.support.v7.internal.widget.** { *; }
-keep public class android.support.v7.internal.view.menu.** { *; }
-keep public class * extends android.support.v4.view.ActionProvider {
public <init>(android.content.Context);
}
-keepclasseswithmembers public class * {
public static void main(java.lang.String[]);
}
-keep public class * implements com.myapppackage.InterfaceClass
-keepattributes EnclosingMethod # was added to avoid 2.2.0 warnings
# Soft obfuscation
-keep public class !com.myapppackage.subpackage.** {
public protected *;
}
模块build.gradle:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.0'
classpath 'me.tatarka:gradle-retrolambda:3.2.5'
classpath 'me.tatarka.retrolambda.projectlombok:lombok.ast:0.2.3.a2'
}
configurations.classpath.exclude group: 'com.android.tools.external.lombok'
}
应用程序build.gradle:
apply plugin: 'com.android.application'
apply plugin: 'me.tatarka.retrolambda'
android {
compileSdkVersion 24
buildToolsversion "24.0.2"
...
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
lintOptions {
abortOnError false
}
}
解决方法:
是的,Android Gradle插件中包含的默认ProGuard规则在2.2-beta2中已更改.主要更改围绕-keepattributes和-renamesourcefileattribute.
我们设法通过复制插件中包含的文件proguard-android.txt和proguard-android-optimize.txt修复了该问题,撤消了部分更改,使Gradle插件改为使用该文件:
proguardFiles 'proguard-android-modified.txt', 'proguard-rules.pro'
如果您将Android Gradle插件的版本降级到2.2-beta1并比较ProGuard文件,那么您会看到差异(是的,这不是唯一的更改…有一堆新的-keep和-keepclasseswithmembernames规则太).
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