安卓问题，程序运行之后，出现unfortunately， has stopped，求解决

[lrzhangshuai]

ogcat：

02-26 01:15:29.880: W/dalvikvm(953): threadid=1: thread exiting with uncaught exception (group=0xb4a6bba8)
02-26 01:15:29.890: E/AndroidRuntime(953): FATAL EXCEPTION: main
02-26 01:15:29.890: E/AndroidRuntime(953): Process: com.example.xiaoxiong, PID: 953
02-26 01:15:29.890: E/AndroidRuntime(953): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.xiaoxiong/com.example.xiaoxiong.MainActivity}: java.lang.NullPointerException
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.ActivityThread.access$800(ActivityThread.java:135)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.os.Handler.dispatchMessage(Handler.java:102)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.os.Looper.loop(Looper.java:136)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.ActivityThread.main(ActivityThread.java:5017)
02-26 01:15:29.890: E/AndroidRuntime(953): at java.lang.reflect.Method.invokeNative(Native Method)
02-26 01:15:29.890: E/AndroidRuntime(953): at java.lang.reflect.Method.invoke(Method.java:515)
02-26 01:15:29.890: E/AndroidRuntime(953): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-26 01:15:29.890: E/AndroidRuntime(953): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-26 01:15:29.890: E/AndroidRuntime(953): at dalvik.system.NativeStart.main(Native Method)
02-26 01:15:29.890: E/AndroidRuntime(953): Caused by: java.lang.NullPointerException
02-26 01:15:29.890: E/AndroidRuntime(953): at com.example.xiaoxiong.MainActivity.onCreate(MainActivity.java:30)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.Activity.performCreate(Activity.java:5231)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
02-26 01:15:29.890: E/AndroidRuntime(953): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
02-26 01:15:29.890: E/AndroidRuntime(953): ... 11 more

[pochuanpiao]

原因是：Caused by: java.lang.NullPointerException 看看你的代码，MainActivity 30行 at com.example.xiaoxiong.MainActivity.onCreate(MainActivity.java:30)

[sheng9hhd]

楼上说的对，看空指针异常