android桌面开发动态壁纸设置问题?

我自己写了一个android桌面,但无法设置动态壁纸,但android自带的桌面又能设置,设置的动态壁纸是系统内置的,android系统为4.0,总是报如下错误:V/RenderScript( 2118): 0x128990 RS Thread exited
V/RenderScript( 2118): 0x128990 Context::~Context done
V/RenderScript( 2118): 0x128990 rsContextDestroy done
W/WindowManager( 1917): Failed looking up window
W/WindowManager( 1917): java.lang.IllegalArgumentException: Requested window android.os.BinderProxy@6e92fa40 does not exist
W/WindowManager( 1917): at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7163)
W/WindowManager( 1917): at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7154)
W/WindowManager( 1917): at com.android.server.wm.WindowManagerService.removeWindow(WindowManagerService.java:2209)
W/WindowManager( 1917): at com.android.server.wm.Session.remove(Session.java:149)
W/WindowManager( 1917): at android.view.IWindowSession$Stub.onTransact(IWindowSession.java:124)
W/WindowManager( 1917): at com.android.server.wm.Session.onTransact(Session.java:111)
W/WindowManager( 1917): at android.os.Binder.execTransact(Binder.java:338)
W/WindowManager( 1917): at dalvik.system.NativeStart.run(Native Method)
E/InputQueue-JNI( 2548): channel '6e97d310 Media:com.android.wallpaper.livepicker/com.android.wallpaper.livepicker.LiveWallpaperPreview (client)' ~ Publisher closed input channel or an error occurred. events=0x8
W/WindowManager( 1917): Failed looking up window
W/WindowManager( 1917): java.lang.IllegalArgumentException: Requested window android.os.BinderProxy@6e990550 does not exist
W/WindowManager( 1917): at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7163)
W/WindowManager( 1917): at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7154)
W/WindowManager( 1917): at com.android.server.wm.WindowManagerService.removeWindow(WindowManagerService.java:2209)
W/WindowManager( 1917): at com.android.server.wm.Session.remove(Session.java:149)
W/WindowManager( 1917): at android.view.IWindowSession$Stub.onTransact(IWindowSession.java:124)
W/WindowManager( 1917): at com.android.server.wm.Session.onTransact(Session.java:111)
W/WindowManager( 1917): at android.os.Binder.execTransact(Binder.java:338)
W/WindowManager( 1917): at dalvik.system.NativeStart.run(Native Method)

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