无法在 Kotlin 中构建发布版本

Posted 2023-04-15

【中文标题】无法在 Kotlin 中构建发布版本

【英文标题】：Unable to build a release build in Kotlin

【发布时间】：2017-10-30 09:57:37

【问题描述】：

将我的 android 项目转换为 Kotlin 后，我无法构建发布版本，该错误似乎与 Proguard 相关。

我看到了 155 条类似警告

Warning:com.example.app.activity.MainActivity$1: can't find referenced field 'android.view.View decorView' in program class com.example.app.activity.MainActivity
Warning:com.example.app.activity.MainActivity$2: can't find referenced field 'android.os.Handler handler' in program class com.example.app.activity.MainActivity

构建失败

Error:Execution failed for task ':MyApp:transformClassesAndResourcesWithProguardForFreeRelease'.
> Job failed, see logs for details

如果我将 build.grade 中的这些指令从 true 更改为 false，则构建成功。

minifyEnabled true
shrinkResources true

对可能出现的问题有什么建议吗？

编辑：

proguard 文件如下：

proguard-android.txt

# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html

-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

# If you want to enable optimization, you should include the
# following:
# -optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
# -optimizationpasses 5
# -allowaccessmodification
#
# Note that you cannot just include these flags in your own
# configuration file; if you are including this file, optimization
# will be turned off. You'll need to either edit this file, or
# duplicate the contents of this file and remove the include of this
# file from your project's proguard.config path property.

-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 * extends android.app.backup.BackupAgent
-keep public class * extends android.preference.Preference
-keep public class * extends android.support.v4.app.Fragment
-keep public class * extends android.app.Fragment
-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 public class * extends android.view.View 
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);


-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);


# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-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>;


# 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.**
-dontwarn io.codetail.animation.**

proguard-rules.txt

# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in /home/francesc/droids/android-sdk-linux/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the ProGuard
# include property in project.properties.
#
# For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

# Add any project specific keep options here:

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the javascript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview 
#   public *;
#

-keep class com.nineoldandroids.**  *; 
-dontwarn io.codetail.animation.**

签名配置如下所示

signingConfigs 
    myConfig 
        Properties keyProps = new Properties()
        keyProps.load(new FileInputStream(file('../release.properties')))
        storeFile file(keyProps["store"])
        keyAlias keyProps["alias"]
        storePassword keyProps["storePass"]
        keyPassword keyProps["keyPass"]
    


buildTypes 
    release 
        proguardFiles 'proguard-android.txt', 'proguard-rules.txt'
        minifyEnabled true
        shrinkResources true
        signingConfig signingConfigs.myConfig
    

【问题讨论】：

可能有用***.com/questions/33547643/…

您的活动中有自定义视图吗？

可能，您可以将 shrinkResources 设置为“true”，因为它只影响资源，而不影响代码

您的活动中是否存在字段 decorView 和处理程序？它们可能会因优化而被删除。

能否为 Proguard 添加所有相关配置？

【参考方案1】：

尝试将@Keep 注释添加到有问题的类（例如MainActivity），看看它是否有帮助。如果是这样，则意味着 minify 正在重命名某些资源，不应该重命名它，因为其他一些资源需要它的原始名称。

【参考方案2】：

尝试在没有 proguard 的情况下进行构建，以了解谁应对该问题负责。