我已经按照教程了解如何在 [android-developer][1] 上制作活动库
[1]: http: //developer.android.com/guide/tutorials/views/hello-gallery.html但我得到了下一个错误:
02-12 17:54:06.221: ERROR/AndroidRuntime(1330): Uncaught handler: thread main exiting due to uncaught exception
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.addsensor.CameraMap/com.addsensor.CameraMap.GalleryCamera}: java.lang.NullPointerException
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.app.ActivityThread.access$1800(ActivityThread.java:112)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.os.Handler.dispatchMessage(Handler.java:99)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.os.Looper.loop(Looper.java:123)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.app.ActivityThread.main(ActivityThread.java:3948)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at java.lang.reflect.Method.invokeNative(Native Method)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at java.lang.reflect.Method.invoke(Method.java:521)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at dalvik.system.NativeStart.main(Native Method)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): Caused by: java.lang.NullPointerException
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at com.addsensor.CameraMap.GalleryCamera.onCreate(GalleryCamera.java:20)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
02-12 17:54:06.301: ERROR/AndroidRuntime(1330): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231)
我还更改了有人在 [stackoverflow][1] 上评论的一件事
[1]:Android Hello,Gallery 教程——“R.styleable 无法解析”但我仍然收到错误消息。这是一个简单的活动,我不知道如何去做。任何人都知道?¿或如何解决它?¿
谢谢