我一直在更新去年发布的应用程序。今天在一个完全不同的活动上修改源代码时，我注意到其中一个活动，与我正在从事的工作完全无关，已经停止工作。它给了我这个错误：
02-08 13:59:53.850: E/AndroidRuntime(11526): FATAL EXCEPTION: main
02-08 13:59:53.850: E/AndroidRuntime(11526): java.lang.NoClassDefFoundError: uk/co/m/panic/MyLocationActivity
02-08 13:59:53.850: E/AndroidRuntime(11526): at uk.co.m.panic.ParentActivity.onItemClick(ParentActivity.java:80)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.widget.AdapterView.performItemClick(AdapterView.java:292)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.widget.AbsListView.performItemClick(AbsListView.java:1108)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.widget.ListView.performItemClick(ListView.java:4760)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2571)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.widget.AbsListView$1.run(AbsListView.java:3284)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.os.Handler.handleCallback(Handler.java:608)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.os.Handler.dispatchMessage(Handler.java:92)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.os.Looper.loop(Looper.java:156)
02-08 13:59:53.850: E/AndroidRuntime(11526): at android.app.ActivityThread.main(ActivityThread.java:5045)
02-08 13:59:53.850: E/AndroidRuntime(11526): at java.lang.reflect.Method.invokeNative(Native Method)
02-08 13:59:53.850: E/AndroidRuntime(11526): at java.lang.reflect.Method.invoke(Method.java:511)
02-08 13:59:53.850: E/AndroidRuntime(11526): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-08 13:59:53.850: E/AndroidRuntime(11526): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-08 13:59:53.850: E/AndroidRuntime(11526): at dalvik.system.NativeStart.main(Native Method)
02-08 13:59:53.850: E/AndroidRuntime(11526): Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
02-08 13:59:53.850: E/AndroidRuntime(11526): at dalvik.system.DexFile.defineClass(Native Method)
02-08 13:59:53.850: E/AndroidRuntime(11526): at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:195)
02-08 13:59:53.850: E/AndroidRuntime(11526): at dalvik.system.DexPathList.findClass(DexPathList.java:315)
02-08 13:59:53.850: E/AndroidRuntime(11526): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:58)
02-08 13:59:53.850: E/AndroidRuntime(11526): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-08 13:59:53.850: E/AndroidRuntime(11526): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-08 13:59:53.850: E/AndroidRuntime(11526): ... 15 more
通常 NoClassDefError 将类似于 minfest 中缺少活动。但在这种情况下不是。类名没有改变，但我确实更新了我的 v. android sdk，所以我不知道这是否涉及...
此行发生错误：
Intent myLocationItent = new Intent(ParentActivity.this, MyLocationActivity.class);