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04-14 19:14:18.176: D/dalvikvm(9081): GC_FOR_ALLOC freed 225K, 3% free 9326K/9584K, paused 16ms, total 16ms
04-14 19:14:18.857: D/AndroidRuntime(9081): Shutting down VM
04-14 19:14:18.857: W/dalvikvm(9081): threadid=1: thread exiting with uncaught exception (group=0x416e5ba8)
04-14 19:14:18.867: E/AndroidRuntime(9081): FATAL EXCEPTION: main
04-14 19:14:18.867: E/AndroidRuntime(9081): Process: com.example.sayhello_wb, PID: 9081
04-14 19:14:18.867: E/AndroidRuntime(9081): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sayhello_wb/com.example.sayhello_wb.MainActivity}: java.lang.NullPointerException
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.os.Handler.dispatchMessage(Handler.java:102)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.os.Looper.loop(Looper.java:136)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-14 19:14:18.867: E/AndroidRuntime(9081): at java.lang.reflect.Method.invokeNative(Native Method)
04-14 19:14:18.867: E/AndroidRuntime(9081): at java.lang.reflect.Method.invoke(Method.java:515)
04-14 19:14:18.867: E/AndroidRuntime(9081): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-14 19:14:18.867: E/AndroidRuntime(9081): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-14 19:14:18.867: E/AndroidRuntime(9081): at dalvik.system.NativeStart.main(Native Method)
04-14 19:14:18.867: E/AndroidRuntime(9081): Caused by: java.lang.NullPointerException
04-14 19:14:18.867: E/AndroidRuntime(9081): at com.example.sayhello_wb.MainActivity.onCreate(MainActivity.java:64)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.Activity.performCreate(Activity.java:5231)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-14 19:14:18.867: E/AndroidRuntime(9081): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-14 19:14:18.867: E/AndroidRuntime(9081): ... 11 more
mobileNum=findviewbyid 去哪呢?