下面有个zip 可下来看看 求解。。
03-19 09:08:10.257: ERROR/AndroidRuntime(262): ERROR: thread attach failed
03-19 09:08:17.247: ERROR/AndroidRuntime(269): Uncaught handler: thread main exiting due to uncaught exception
03-19 09:08:17.558: ERROR/AndroidRuntime(269): java.lang.RuntimeException: Unable to start activity ComponentInfo{abc.com/abc.com.A2}: java.lang.NullPointerException
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.os.Handler.dispatchMessage(Handler.java:99)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.os.Looper.loop(Looper.java:123)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.ActivityThread.main(ActivityThread.java:4363)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at java.lang.reflect.Method.invoke(Method.java:521)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at dalvik.system.NativeStart.main(Native Method)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): Caused by: java.lang.NullPointerException
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at abc.com.A2.onCreate(A2.java:19)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
03-19 09:08:17.558: ERROR/AndroidRuntime(269): ... 11 more
A2。java L19.
main_bt1 没有通过findViewById(R.id.xxx); 方式初始化哈。