Java 使用ProGuard导致生成失败，或在尝试某些ProGuard规则后强制关闭空UI

我正在我的应用程序中使用ProGuard和shrink资源功能，如下所示：

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

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

当我构建应用程序时，它会显示一些警告，但构建不成功，如下所示：

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

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

我尝试了一些ProGuard规则来避免这个问题，它成功地构建了应用程序。但当我在我的设备上安装并打开应用程序时，它显示没有UI，然后显示设备freez，然后它被迫从系统关闭

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在我的情况下，有人能帮我为ProGuard制定正确的规则吗。

引用的类实际上不在您的项目或依赖项中，因此您不能保留它们

有些库依赖于新的平台代码或其他库而构建，但设计为在没有它的情况下也可以工作。如果项目中没有包含这些依赖项，则会收到警告。所有这些都是完全可以预料的，你只需要告诉proguard你知道这件事

例如，您使用依赖于java.nio的Okio，但它仅在普通java和Android O中可用。Okio设计为在没有java.nio的情况下工作，但您必须告诉proguard您对此没有问题。因此，您将此添加到proguard规则中：

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

您可以在此处找到其他库的更多规则：

如果你找不到一个图书馆的规则，但确信这个图书馆会工作，只需要闭上proguard的嘴——dontwarn是你的朋友。例如

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

或者如果你想把包裹里的东西都封起来

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

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您是否在proguard.txt文件中指定了不应混淆的类和包？在文件中尝试选项单击“使缓存无效/重新启动studio”。另外，清理项目并重建可能会有所帮助。@SripadRaj这与模糊处理无关，请阅读我的答案以了解发生这种情况的原因。@Omi仍然存在相同的问题。我认为解决方案是为ProGuard制定正确的规则，以避免出现警告，同时不要让应用程序被迫关闭，而用户界面是空的。我很不幸得到了正确的规则，所以我在这里发布了…@SripadRaj问题是我如何知道我应该保留哪些类。。！这些类是警告信息中显示的吗？！