使一个自定义视图无效会导致视图组中的所有自定义视图无效？

Question

我有一个自定义视图组。在这个自定义视图组中有许多自定义视图。这些自定义视图在布局中互相重叠。

这些重叠的视图是有意为之，以创建“层次”。因此，一个层可能创建一些静态内容，但另一个层次的视图则创建不同的动画内容。问题出现在我从另一个线程调用.postInvalidate来刷新其中一个视图，该视图基本上是以60FPS运行的动画。在层叠视图之外，设备（Galaxy S3）可以达到60FPS。

在这个自定义视图组内部，.invalidate会导致2个硬件渲染视图中的1个失效，并且一些软件视图也会随之失效。

MyCustomViewThatShouldNotInvalidate(AbstractDialLayer).onDraw(Canvas) line: 68    
MyCustomViewThatShouldNotInvalidate.onDraw(Canvas) line: 79    
MyCustomViewThatShouldNotInvalidate(View).draw(Canvas) line: 13650    
MyCustomViewThatShouldNotInvalidate(View).draw(Canvas, ViewGroup, long) line: 13534    
MyCustomViewGroup(ViewGroup).drawChild(Canvas, View, long) line: 2938    
MyCustomViewGroup(ViewGroup).dispatchDraw(Canvas) line: 2808    
MyCustomViewGroup(View).buildDrawingCache(boolean) line: 12909    
MyCustomViewGroup(View).getDisplayList(DisplayList, boolean) line: 12580    
MyCustomViewGroup(View).getDisplayList() line: 12645
RelativeLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
RelativeLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
RelativeLayout(View).getDisplayList() line: 12645    
RelativeLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
RelativeLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
RelativeLayout(View).getDisplayList() line: 12645    
NoSaveStateFrameLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
NoSaveStateFrameLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
NoSaveStateFrameLayout(View).getDisplayList() line: 12645    
ViewPager(ViewGroup).dispatchGetDisplayList() line: 2920    
ViewPager(View).getDisplayList(DisplayList, boolean) line: 12537    
ViewPager(View).getDisplayList() line: 12645    
LinearLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
LinearLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
LinearLayout(View).getDisplayList() line: 12645    
RelativeLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
RelativeLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
RelativeLayout(View).getDisplayList() line: 12645    
NoSaveStateFrameLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
NoSaveStateFrameLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
NoSaveStateFrameLayout(View).getDisplayList() line: 12645    
LinearLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
LinearLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
LinearLayout(View).getDisplayList() line: 12645    
LongPressGestureDetectingFrameLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
LongPressGestureDetectingFrameLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
LongPressGestureDetectingFrameLayout(View).getDisplayList() line: 12645    
FrameLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
FrameLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
FrameLayout(View).getDisplayList() line: 12645    
LinearLayout(ViewGroup).dispatchGetDisplayList() line: 2920    
LinearLayout(View).getDisplayList(DisplayList, boolean) line: 12537    
LinearLayout(View).getDisplayList() line: 12645    
CustomViewAbove(ViewGroup).dispatchGetDisplayList() line: 2920    
CustomViewAbove(View).getDisplayList(DisplayList, boolean) line: 12537    
CustomViewAbove(View).getDisplayList() line: 12645    
SlidingMenu(ViewGroup).dispatchGetDisplayList() line: 2920    
SlidingMenu(View).getDisplayList(DisplayList, boolean) line: 12537    
SlidingMenu(View).getDisplayList() line: 12645    
PhoneWindow$DecorView(ViewGroup).dispatchGetDisplayList() line: 2920    
PhoneWindow$DecorView(View).getDisplayList(DisplayList, boolean) line: 12537    
PhoneWindow$DecorView(View).getDisplayList() line: 12645    
HardwareRenderer$Gl20Renderer(HardwareRenderer$GlRenderer).draw(View, View$AttachInfo,         HardwareRenderer$HardwareDrawCallbacks, Rect) line: 1170    
ViewRootImpl.draw(boolean) line: 2275    
ViewRootImpl.performDraw() line: 2147    
ViewRootImpl.performTraversals() line: 1958    
ViewRootImpl.doTraversal() line: 1112    
ViewRootImpl$TraversalRunnable.run() line: 4474    
Choreographer$CallbackRecord.run(long) line: 725    
Choreographer.doCallbacks(int, long) line: 555    
Choreographer.doFrame(long, int) line: 525    
Choreographer$FrameDisplayEventReceiver.run() line: 711    
Handler.handleCallback(Message) line: 615    
Choreographer$FrameHandler(Handler).dispatchMessage(Message) line: 92    
Looper.loop() line: 137    
ActivityThread.main(String[]) line: 4918    
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not         available [native method]    
Method.invoke(Object, Object...) line: 511    
ZygoteInit$MethodAndArgsCaller.run() line: 1004    
ZygoteInit.main(String[]) line: 771    
NativeStart.main(String[]) line: not available [native method]    

- McNinja

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你有任何可以用来重现这个问题的代码吗？ - Kasra Rahjerdi

Answer 1

在视图上调用Invalidate会将无效调用链接到其在视图层次结构中的父级。如果启用硬件加速，它可能会根据HardwareRenderer类中的标志仅使一切失效。这是一种优化。您可以检查无效实现。以下是相关调用的链接-Invalidate() -check for hardware acceleration 为确保，请在该应用程序中检查您设备上的HardwareRenderer.RENDER_DIRTY_REGIONS的值。

- Aniket Awati