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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

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1 回答 1

1

您正在尝试在方法第 20 行中使用对 null 的引用（例如变量 uninitialized等） 。CameraMap.GalleryCamera,onCreate()

请发布此方法的代码（并注明第 20 行）。

于 2011-02-16T16:14:55.053 回答