NPE during onVisibilityChanged

[GoogleCodeExporter]

java.lang.NullPointerException
at 
org.mikeyin.livewallpaper.GalleryWallpaper$GalleryEngine.onVisibilityChanged(Gal
leryWallpaper.java:204)
at 
android.service.wallpaper.WallpaperService$Engine.reportVisibility(WallpaperServ
ice.java:637)
at 
android.service.wallpaper.WallpaperService$Engine.doVisibilityChanged(WallpaperS
ervice.java:620)
at 
android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessag
e(WallpaperService.java:842)
at 
com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java
:61)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:144)
at android.app.ActivityThread.main(ActivityThread.java:4937)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)

Original issue reported on code.google.com by yincrash on 15 Oct 2010 at 11:19