AlertDialog单元测试 - java.lang.VerifyError：操作数堆栈上的错误类型

Question

我有一个活动MyActivity.java，其中我使用AlertDialog生成AlertDialog.Builder(this);。 现在，我正在尝试为junit编写一个单元测试（MyActivity.java），将其视为一个简单的java类，并为Android的框架类创建阴影类。当我尝试运行测试时，我在尝试实例化类时遇到错误：java.lang.VerifyError: Bad type on operand stack

java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    com/domain/myApp/MyActivity.myMethod()V @31: invokespecial
  Reason:
    Type 'com/domain/myApp/MyActivity' (current frame, stack[2]) is not assignable to 'android/content/Context'
  Current Frame:
    bci: @31
    flags: { }
    locals: { 'com/domain/myApp/MyActivity', 'android/content/res/Resources' }
    stack: { uninitialized 26, uninitialized 26, 'com/domain/myApp/MyActivity' }
  Bytecode:
    0x0000000: 120f 123a b800 112a b400 03c6 000a 120f
    0x0000010: 123b b800 3c2a b600 184c bb00 3d59 2ab7
    0x0000020: 003e 4d2a 2c2b 123f b600 40b6 0041 2b12
    0x0000030: 42b6 0040 b600 432b 1244 b600 402a b700
    0x0000040: 45b6 0046 2b12 47b6 0040 bb00 4859 2ab7
    0x0000050: 0049 b600 4abb 004b 592a b700 4cb6 004d
    0x0000060: b600 4eb5 0003 2ab4 0003 b600 4f2a b400
    0x0000070: 0312 51b6 0052 c000 534e 2db6 0054 57b1
    0x0000080:                                        
  Stackmap Table:
    same_frame(@21)


    at com/domain/myApp/MyActivityTest.before(MyActivityTest.java:93)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.DefaultInternalRunner$1.run(Unknown Source)
    at org.mockito.internal.runners.DefaultInternalRunner.run(Unknown Source)
    at org.mockito.junit.MockitoJUnitRunner.run(Unknown Source)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

根据我的研究，这个错误正在发生，因为我试图在静态上下文中引用this（AlertDialog.Builder）。所以基本上我试图在它完全构建之前引用MyActivity。 我想如果在我的AlertDialog的影子课中我将AlertDialog.Builder类非静态化，那么在测试期间不会出现这个问题。但事实并非如此。有没有人有任何线索如何为此获得解决方法？

Answer 1

发生这种情况是因为你必须拥有Activity的影子类。 实际的Activity类扩展了ContextThemeWrapper类，扩展了ContextWrapper类，扩展了抽象的Context类。 只需创建一个阴影Context类，并使用它来扩展你的影子Activity类。 这整个错误基本上是不兼容的类型错误。