开发时：

Question

我在生成应用程序的APK时遇到问题。

如果我调试/运行应用程序，它可以正常工作。但是当我尝试生成相应的APK时，Android Studio会给我很多警告和一个错误：

Note: there were 159 duplicate class definitions.
  (http://proguard.sourceforge.net/manual/troubleshooting.html#duplicateclass)
Warning:com.thoughtworks.xstream.converters.reflection.CGLIBEnhancedConverter$ReverseEngineeredCallbackFilter: can't find superclass or interface net.sf.cglib.proxy.CallbackFilter
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find superclass or interface java.awt.datatransfer.Transferable
Warning:org.apache.harmony.awt.datatransfer.NativeClipboard: can't find superclass or interface java.awt.datatransfer.Clipboard
Warning:library class android.content.res.XmlResourceParser extends or implements program class org.xmlpull.v1.XmlPullParser
Warning:library class org.apache.http.auth.AuthenticationException extends or implements program class org.apache.http.ProtocolException
[...]
Warning:library class org.apache.http.impl.conn.LoggingSessionOutputBuffer extends or implements program class org.apache.http.io.SessionOutputBuffer
Warning:com.itextpdf.testutils.ITextTest: can't find referenced class javax.management.OperationsException
Warning:com.itextpdf.text.pdf.BarcodeCodabar: can't find referenced class java.awt.Color
[...]
Warning:com.itextpdf.text.pdf.security.MakeXmlSignature: can't find referenced class javax.xml.crypto.dsig.spec.C14NMethodParameterSpec
[...]
Warning:com.sun.mail.handlers.image_gif: can't find referenced class java.awt.datatransfer.DataFlavor
[...]
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.Sasl
[...]
Warning:com.thoughtworks.xstream.converters.extended.ColorConverter: can't find referenced class java.awt.Color
[...]
Warning:org.apache.harmony.awt.ContextStorage: can't find referenced class java.awt.Toolkit
[...]
Warning:org.spongycastle.jce.provider.X509LDAPCertStoreSpi: can't find referenced class javax.naming.directory.InitialDirContext
[...]
Warning:library class android.content.Intent depends on program class org.xmlpull.v1.XmlPullParser
[...]
Warning:library class org.apache.http.client.HttpClient depends on program class org.apache.http.HttpResponse
[...]
Warning:library class org.xmlpull.v1.XmlPullParserFactory depends on program class org.xmlpull.v1.XmlPullParser
Warning:there were 1077 unresolved references to classes or interfaces.
         You may need to add missing library jars or update their versions.
         If your code works fine without the missing classes, you can suppress
         the warnings with '-dontwarn' options.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
Warning:there were 141 instances of library classes depending on program classes.
         You must avoid such dependencies, since the program classes will
         be processed, while the library classes will remain unchanged.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#dependency)
Warning:there were 5 unresolved references to program class members.
         Your input classes appear to be inconsistent.
         You may need to recompile the code.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedprogramclassmember)
:vet:proguardInternalRelease FAILED
Error:Execution failed for task ':PROJECTNAME:proguardInternalRelease'.
> java.io.IOException: Please correct the above warnings first.
Information:BUILD FAILED
Information:Total time: 13.878 secs
Information:1 error
Information:679 warnings
Information:See complete output in console

该项目由一个图书馆项目组成，在settings.gradle：

中作为外部项目导入

include ':library'
project(':library').projectDir = new File(settingsDir, '../Library/library')

包含所有依赖项。

图书馆的build.gradle是

apply plugin: 'com.android.library'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 21
        multiDexEnabled true
    }

    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
    }

}

dependencies {
    compile 'com.google.android.gms:play-services:+'
    compile 'com.android.support:support-v13:21.0.+'
    compile 'com.android.support:multidex:1.0.0'
    compile('ch.acra:acra:4.5.0') {
        exclude group: 'org.json'
    }
    compile 'org.apache.httpcomponents:httpcore:4.3'
    compile('org.apache.httpcomponents:httpmime:4.3.1') {
        exclude group: 'org.apache.httpcomponents', module: 'httpcore'
        exclude group: 'org.apache.httpcomponents', module: 'httpclient'
    }
    compile('javax.mail:mail:1.4.7') {
        exclude module: 'activation'
    }
    compile 'com.madgag.spongycastle:pkix:1.50.0.0'
    compile 'org.ccil.cowan.tagsoup:tagsoup:1.2.1'
    compile ('com.itextpdf.tool:xmlworker:5.5.1'){
        exclude module: 'itextpdf'
    }
    compile('com.thoughtworks.xstream:xstream:1.4.4') {
        exclude group: 'xmlpull', module: 'xmlpull'
    }
    compile 'com.google.zxing:core:3.0.1'
    compile files('libs/activation.jar')
    compile files('libs/additionnal.jar')
    compile files('libs/miniTemplator.jar')
    compile files('libs/itextg-5.5.1.jar')
}

，项目build.gradle是

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "my.package.name"
        minSdkVersion 15
        targetSdkVersion 21
        multiDexEnabled true
    }

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    productFlavors {
        def BOOLEAN = "boolean"
        def TRUE = "true"
        def FALSE = "false"
        def A_FIELD= "A_FIELD"

        internal {
            buildConfigField BOOLEAN, A_FIELD, FALSE
        }

        official {
            buildConfigField BOOLEAN, A_FIELD, TRUE
        }
    }


    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
    }
}

dependencies {
    compile project(':library')
}

afterEvaluate {
    tasks.matching {
        it.name.startsWith('dex')
    }.each { dx ->
        if (dx.additionalParameters == null) {
            dx.additionalParameters = []
        }
        dx.additionalParameters += '--multi-dex'
    }
}

如何修复它以便可以编译APK？

编辑：在我的proguard-rules.pro中添加了很多-dontwarn选项后，无论如何我得到了错误，我无法解决这些警告（Here有一些提示，但没有对于这些警告......）：

Warning:com.itextpdf.text.pdf.security.PdfPKCS7: can't find referenced method 'ASN1Integer(int)' in program class org.spongycastle.asn1.ASN1Integer
Warning:com.sun.activation.viewers.ImageViewer: can't find referenced method 'java.awt.Component add(java.awt.Component)' in program class com.sun.activation.viewers.ImageViewer
Warning:com.sun.activation.viewers.ImageViewer: can't find referenced method 'java.awt.Toolkit getToolkit()' in program class com.sun.activation.viewers.ImageViewer
Warning:com.sun.activation.viewers.ImageViewer: can't find referenced method 'void invalidate()' in program class com.sun.activation.viewers.ImageViewer
Warning:com.sun.activation.viewers.ImageViewer: can't find referenced method 'void validate()' in program class com.sun.activation.viewers.ImageViewer
Warning:com.sun.activation.viewers.ImageViewer: can't find referenced method 'void doLayout()' in program class com.sun.activation.viewers.ImageViewer
Warning:com.sun.activation.viewers.ImageViewerCanvas: can't find referenced method 'void invalidate()' in program class com.sun.activation.viewers.ImageViewerCanvas
Warning:com.sun.activation.viewers.ImageViewerCanvas: can't find referenced method 'void repaint()' in program class com.sun.activation.viewers.ImageViewerCanvas
Warning:com.sun.activation.viewers.TextEditor: can't find referenced method 'void setLayout(java.awt.LayoutManager)' in program class com.sun.activation.viewers.TextEditor
Warning:com.sun.activation.viewers.TextEditor: can't find referenced method 'void invalidate()' in program class com.sun.activation.viewers.TextEditor
Warning:com.sun.activation.viewers.TextViewer: can't find referenced method 'void setLayout(java.awt.LayoutManager)' in program class com.sun.activation.viewers.TextViewer
Warning:com.sun.activation.viewers.TextViewer: can't find referenced method 'java.awt.Component add(java.awt.Component)' in program class com.sun.activation.viewers.TextViewer
Warning:com.sun.activation.viewers.TextViewer: can't find referenced method 'void invalidate()' in program class com.sun.activation.viewers.TextViewer
Warning:javax.activation.ActivationDataFlavor: can't find referenced method 'boolean isMimeTypeEqual(java.awt.datatransfer.DataFlavor)' in program class javax.activation.ActivationDataFlavor
Warning:there were 14 unresolved references to program class members.
         Your input classes appear to be inconsistent.
         You may need to recompile the code.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedprogramclassmember)
:vet:proguardInternalRelease FAILED
Error:Execution failed for task ':vet:proguardInternalRelease'.
> java.io.IOException: Please correct the above warnings first.

Answer 1

这些都是令人讨厌的清理工作。现在更好的库包括它们在库包中的设置，但旧的（或更长的）库仍然不是。以下是我遵循的流程：

开发时：

每当包含新库时，请务必查看其文档以了解其建议的ProGuard设置。（如果你勤勉于此，它可以节省很多混乱并在以后挖掘。）
如果库作者提供了一个AAR包（例如将'@aar'添加到gradle依赖行的末尾以获得完整的AAR而不是更简单的JAR），他们甚至可能在那里包含必要的ProGuard异常你将自动获得。（但根据我的经验，大多数作者还没有采取额外的步骤。）
每当在需要动态内省的自定义代码中添加新的命名空间/类时，例如在使用依赖注入容器或JSON解析器时，请确保ProGuard设置为根据其包名称选择它们，或者自己添加一个一次一堂课。

构建并获取错误后：

从所有以前缀error:开头的行开始，然后warning:（note:行不会停止构建）。
检查每行提到的命名空间。查找关联的库（例如com.newrelic.SomeClass可能是New Relic库）。如果找不到，请尝试Google搜索以查看命名空间是否可以帮助您跟踪github README或其他可能识别命名空间包含哪个库的内容。或者，查看 Android Studio＆gt;项目＆gt;套餐＆gt;库列表（第一次显示需要一段时间）并在那里跟踪命名空间。希望源代码可用，并在文件头注释中包含库详细信息。
查找该库的文档。希望它提到必要的ProGuard更改。
重建。

库文档所说的所有更改，但仍然收到警告：

开始添加-dontwarn行。例如：-dontwarn com.newrelic.**（不要忘记双星号，因此它会忽略该命名空间下的整个树;否则单个星号将只忽略命名空间的直接子节点。）
如果你开始使用盲dontwarn语句，你必须测试已编译的应用程序（APK）！因为它现在很可能会崩溃你，即使调试（非ProGuard）版本一直运行良好。确保测试您使用的所有库，检查logcat消息，并确保使用dontwarn执行盲目跳过的所有代码路径/类！

搞砸了，我的老板说我必须释放这个东西：

禁用ProGuard： - （

使用Android Studio中的项目属性对话框，或编辑模块build.gradle文件并更改android { buildTypes { release { minifyEnabled true } } }并将其设置为 false 。

您不会获得ProGuard优化，APK会更大，代码也不会被混淆。但是如果你的老板现在只需要它并且你没有时间进行调试，那么禁用它就不会是世界末日。

虽然你真的应该使用ProGuard。或许现在是时候与老板讨论如何让开发人员有更多时间来做我们需要的无聊技术。

使用ProGuard缩小功能时，无法使用Android Studio构建APK

1 个答案:

开发时：

构建并获取错误后：

库文档所说的所有更改，但仍然收到警告：

搞砸了，我的老板说我必须释放这个东西：