Android ProGuard can'；编译版本apk时找不到类

我对proguard和volley库（）有问题。它在调试模式下构建得很好，但在发行版中，它给出了一个错误。我在Stackoverflow上尝试了所有的解决方案，但没有一个对我有效。这是错误

Information:Gradle tasks [:app:assembleRelease]
:app:preBuild UP-TO-DATE
:app:preReleaseBuild UP-TO-DATE
:app:checkReleaseManifest
:app:preDebugBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72311Library UP-TO-DATE
:app:prepareComAndroidSupportDesign2311Library UP-TO-DATE
:app:prepareComAndroidSupportRecyclerviewV72311Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42311Library UP-TO-DATE
:app:prepareReleaseDependencies
:app:compileReleaseAidl UP-TO-DATE
:app:compileReleaseRenderscript UP-TO-DATE
:app:generateReleaseBuildConfig UP-TO-DATE
:app:generateReleaseAssets UP-TO-DATE
:app:mergeReleaseAssets UP-TO-DATE
:app:generateReleaseResValues UP-TO-DATE
:app:generateReleaseResources UP-TO-DATE
:app:mergeReleaseResources UP-TO-DATE
:app:processReleaseManifest UP-TO-DATE
:app:processReleaseResources UP-TO-DATE
:app:generateReleaseSources UP-TO-DATE
:app:processReleaseJavaRes UP-TO-DATE
:app:compileReleaseJavaWithJavac UP-TO-DATE
:app:compileReleaseNdk UP-TO-DATE
:app:compileReleaseSources UP-TO-DATE
:app:proguardRelease
Unexpected error while performing partial evaluation:
  Class       = [com/android/volley/toolbox/HttpClientStack]
  Method      = [performRequest(Lcom/android/volley/Request;Ljava/util/Map;)Lorg/apache/http/HttpResponse;]
  Exception   = [java.lang.IllegalArgumentException] (Can't find common super class of [com/android/volley/Request] (with 2 known super classes) and [com/android/volley/toolbox/HttpClientStack$HttpPatch] (with 1 known super classes))
Exception while processing task 
java.lang.IllegalArgumentException: Can't find common super class of [com/android/volley/Request] (with 2 known super classes) and [com/android/volley/toolbox/HttpClientStack$HttpPatch] (with 1 known super classes)
    at proguard.evaluation.value.TypedReferenceValue.findCommonClass(TypedReferenceValue.java:441)
    at proguard.evaluation.value.TypedReferenceValue.generalize(TypedReferenceValue.java:277)
    at proguard.evaluation.value.TypedReferenceValue.generalize(TypedReferenceValue.java:201)
    at proguard.evaluation.value.ReferenceValue.generalize(ReferenceValue.java:298)
    at proguard.evaluation.Variables.generalize(Variables.java:136)
    at proguard.evaluation.TracedVariables.generalize(TracedVariables.java:118)
    at proguard.optimize.evaluation.PartialEvaluator.evaluateSingleInstructionBlock(PartialEvaluator.java:690)
    at proguard.optimize.evaluation.PartialEvaluator.evaluateInstructionBlock(PartialEvaluator.java:609)
    at proguard.optimize.evaluation.PartialEvaluator.evaluateInstructionBlockAndExceptionHandlers(PartialEvaluator.java:567)
    at proguard.optimize.evaluation.PartialEvaluator.visitCodeAttribute0(PartialEvaluator.java:271)
    at proguard.optimize.evaluation.PartialEvaluator.visitCodeAttribute(PartialEvaluator.java:188)
    at proguard.optimize.evaluation.SimpleEnumUseChecker.visitCodeAttribute(SimpleEnumUseChecker.java:115)
    at proguard.classfile.attribute.CodeAttribute.accept(CodeAttribute.java:101)
    at proguard.classfile.ProgramMethod.attributesAccept(ProgramMethod.java:81)
    at proguard.classfile.attribute.visitor.AllAttributeVisitor.visitProgramMember(AllAttributeVisitor.java:95)
    at proguard.classfile.util.SimplifiedVisitor.visitProgramMethod(SimplifiedVisitor.java:92)
    at proguard.classfile.ProgramMethod.accept(ProgramMethod.java:73)
    at proguard.classfile.ProgramClass.methodsAccept(ProgramClass.java:516)
    at proguard.optimize.evaluation.SimpleEnumUseChecker.visitProgramClass(SimpleEnumUseChecker.java:102)
    at proguard.classfile.ProgramClass.accept(ProgramClass.java:358)
    at proguard.classfile.ClassPool.classesAccept(ClassPool.java:124)
    at proguard.optimize.Optimizer.execute(Optimizer.java:389)
    at proguard.ProGuard.optimize(ProGuard.java:328)
    at proguard.ProGuard.execute(ProGuard.java:127)
    at proguard.gradle.ProGuardTask.proguard(ProGuardTask.java:1074)
    at com.android.build.gradle.tasks.AndroidProGuardTask.doMinification(AndroidProGuardTask.java:139)
    at com.android.build.gradle.tasks.AndroidProGuardTask$1.run(AndroidProGuardTask.java:115)
    at com.android.builder.tasks.Job.runTask(Job.java:48)
    at com.android.build.gradle.tasks.SimpleWorkQueue$EmptyThreadContext.runTask(SimpleWorkQueue.java:41)
    at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:227)
    at java.lang.Thread.run(Thread.java:745)
:app:dexRelease UP-TO-DATE
:app:validateExternalOverrideSigning
:app:packageRelease FAILED
Error:Execution failed for task ':app:packageRelease'.
> Unable to compute hash of C:\Users\MyName\AndroidStudioProjects\AppName\app\build\intermediates\classes-proguard\release\classes.jar
Information:BUILD FAILED
Information:Total time: 37.612 secs
Information:1 error
Information:0 warnings
Information:See complete output in console

这是我在proguard-rules.pro中的设置

-dontwarn org.apache.http.**
-dontwarn android.net.http.AndroidHttpClient
-dontwarn com.google.android.gms.**
-dontwarn com.android.volley.toolbox.**

---

您必须保持以下截击库：

-keep class com.android.volley.** { *; }

---

在我的情况下，我的构建中缺少这一行。gradle:

proguardFiles getDefaultProguardFile("proguard-android.txt")

默认规则包含该规则

-dontoptimize

---

错误的主要原因是什么

如果将

android{usebrary'org.apache.http.legacy'}

添加到

build.gradle

，是否也会发生这种情况？请发布

build.gradle

脚本？谢谢