1. 问题描述：
运行android项目时出现以下错误信息：
05-20 11:23:30.272: D/AndroidRuntime(1833): Shutting down VM
05-20 11:23:30.272: W/dalvikvm(1833): threadid=1: thread exiting with uncaught exception (group=0xb4ae9ba8)
05-20 11:23:30.292: E/AndroidRuntime(1833): FATAL EXCEPTION: main
05-20 11:23:30.292: E/AndroidRuntime(1833): Process: com.gditc.mmms, PID: 1833
05-20 11:23:30.292: E/AndroidRuntime(1833): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gditc.mmms/com.gditc.mmms.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.gditc.mmms.MainActivity" on path: DexPathList[[zip file "/data/app/com.gditc.mmms-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.gditc.mmms-1, /system/lib]]
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.ActivityThread.access0(ActivityThread.java:135)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.os.Handler.dispatchMessage(Handler.java:102)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.os.Looper.loop(Looper.java:136)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-20 11:23:30.292: E/AndroidRuntime(1833): at java.lang.reflect.Method.invokeNative(Native Method)
05-20 11:23:30.292: E/AndroidRuntime(1833): at java.lang.reflect.Method.invoke(Method.java:515)
05-20 11:23:30.292: E/AndroidRuntime(1833): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-20 11:23:30.292: E/AndroidRuntime(1833): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-20 11:23:30.292: E/AndroidRuntime(1833): at dalvik.system.NativeStart.main(Native Method)
05-20 11:23:30.292: E/AndroidRuntime(1833): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gditc.mmms.MainActivity" on path: DexPathList[[zip file "/data/app/com.gditc.mmms-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.gditc.mmms-1, /system/lib]]
05-20 11:23:30.292: E/AndroidRuntime(1833): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
05-20 11:23:30.292: E/AndroidRuntime(1833): at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
05-20 11:23:30.292: E/AndroidRuntime(1833): at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
05-20 11:23:30.292: E/AndroidRuntime(1833): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
05-20 11:23:30.292: E/AndroidRuntime(1833): ... 11 more05-20 11: 
