Android：NoClassDefFoundError但不存在

Question

我一直在更新去年发布的应用程序。在今天修改源代码时，我发现了一个完全不同的活动，与我正在工作的内容完全无关。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会像活动从minfest缺少的东西。但在这种情况下并非如此。这些类名称没有改变，但我没有更新我的v Android SDK中，所以我不知道这是否有过参与......在这条线发生

错误：

Intent myLocationItent = new Intent(ParentActivity.this, MyLocationActivity.class); 

Answer 1

如果使用.jar文件，您必须将其添加到项目根目录中的libs/文件夹中（src/, res/,等旁边）。检查这种情况。