在嘗試一些ProGuard規則后，使用ProGuard導致構建失敗或用空UI強制關閉

Question

我在應用中使用ProGuard並縮小資源功能，如下所示：

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

當我構建應用程序時，它會顯示一些警告，但構建失敗，如下所示：

Information:Gradle tasks [:app:assembleRelease]
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:com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.Sasl
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.SaslClient
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.SaslException
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.SaslClient
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.SaslException
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator$1: can't find referenced class javax.security.auth.callback.NameCallback
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator$1: can't find referenced class javax.security.sasl.RealmCallback
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator$1: can't find referenced class javax.security.sasl.RealmChoiceCallback
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator$1: can't find referenced class javax.security.auth.callback.NameCallback
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator$1: can't find referenced class javax.security.sasl.RealmCallback
Warning:com.sun.mail.imap.protocol.IMAPSaslAuthenticator$1: can't find referenced class javax.security.sasl.RealmChoiceCallback
Warning:javax.activation.CommandInfo: can't find referenced class java.beans.Beans
Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class java.nio.file.Files
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:org.apache.harmony.awt.ContextStorage: can't find referenced class java.awt.Toolkit
Warning:org.apache.harmony.awt.ContextStorage: can't find referenced class java.awt.GraphicsEnvironment
Warning:org.apache.harmony.awt.ContextStorage: can't find referenced class java.awt.Toolkit
Warning:org.apache.harmony.awt.ContextStorage: can't find referenced class java.awt.GraphicsEnvironment
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.dnd.DropTargetContext
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.dnd.peer.DropTargetContextPeer
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.dnd.DragGestureEvent
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.dnd.peer.DragSourceContextPeer
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DTK: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataProvider: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.Transferable
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.UnsupportedFlavorException
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.Image
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.UnsupportedFlavorException
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.DirectColorModel
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.DataBufferInt
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.Raster
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.ComponentColorModel
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.color.ColorSpace
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.ComponentColorModel
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.DataBufferByte
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.Raster
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.DataBufferUShort
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.Image
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.ColorModel
Warning:org.apache.harmony.awt.datatransfer.DataProxy: can't find referenced class java.awt.image.WritableRaster
Warning:org.apache.harmony.awt.datatransfer.DataSnapshot: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataSnapshot: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.Transferable
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.Transferable
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.Image
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.Image
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.Graphics
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.WritableRaster
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.DataBufferInt
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.Transferable
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.Image
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.Graphics
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.BufferedImage
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.image.DataBufferInt
Warning:org.apache.harmony.awt.datatransfer.DataSource: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.Point
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceContext
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceEvent
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceContext
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceDropEvent
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceDragEvent
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceContext
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.Point
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceContext
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.Point
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceContext
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.Point
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceContext
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.Point
Warning:org.apache.harmony.awt.datatransfer.DragSourceEventProxy: can't find referenced class java.awt.dnd.DragSourceDragEvent
Warning:org.apache.harmony.awt.datatransfer.FlavorsComparator: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.NativeClipboard: can't find referenced class java.awt.datatransfer.Clipboard
Warning:org.apache.harmony.awt.datatransfer.TextFlavor: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.TextFlavor: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.TextFlavor: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:org.apache.harmony.awt.datatransfer.TextFlavor: can't find referenced class java.awt.datatransfer.SystemFlavorMap
Warning:org.apache.harmony.awt.datatransfer.TextFlavor: can't find referenced class java.awt.datatransfer.DataFlavor
Warning:there were 261 unresolved references to classes or interfaces.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> Job failed, see logs for details
Information:BUILD FAILED
Information:Total time: 3.68 secs
Information:1 error
Information:122 warnings
Information:See complete output in console

我嘗試了一些ProGuard規則來避免該問題，它成功地構建了該應用程序。 但是，當我在設備上安裝該應用程序並打開它時，它沒有顯示UI，然后設備凍結，然后被迫從系統關閉。

在我所遇到的情況下，誰能為我提供有關ProGuard的正確規則的幫助。

Answer 1

引用的類實際上不在您的項目或依賴項中，因此您無法保留它們。

有些庫是依賴於新平台代碼或其他庫而構建的，但也可以在沒有該庫的情況下工作。 如果您的項目中未包含這些依賴項，則會收到警告。 所有這些都是完全可以預期的，您只需要告訴Proguard您對此有所了解。

例如，您使用依賴於java.nio的Okio，但僅在純Java和Android O中可用。Okio設計為在沒有java.nio的情況下工作，但是您必須告訴proguard您對此表示滿意。 因此，您將此添加到您的proguard規則中：

# Okio
-keep class sun.misc.Unsafe { *; }
-dontwarn java.nio.file.*
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
-dontwarn okio.**

您可以在這里找到其他庫的更多規則： https : //github.com/krschultz/android-proguard-snippets/tree/master/libraries

如果您沒有找到圖書館的規則，但是有信心圖書館可以正常工作並且只需要關閉保護器，則-dontwarn是您的朋友。 例如

-dontwarn org.apache.harmony.awt.datatransfer.DataProxy
-dontwarn org.apache.harmony.awt.datatransfer.NativeClipboard

或者如果您想關閉軟件包中的所有內容

-dontwarn org.apache.harmony.awt.**