android - Why view.onLayout() is called repetitively when changed=false? -


from official docs:

android docs - view

protected void onlayout (boolean changed, int left, int top, int right, int bottom)  parameters changed new size or position view left    left position, relative parent top     top position, relative parent right   right position, relative parent bottom  bottom position, relative parent

why custom view called repetitively changed=false? normal?

here's call tree:

synoptic.onlayout(boolean, int, int, int, int) line: 130     synoptic(view).layout(int, int, int, int) line: 11282    synoptic(viewgroup).layout(int, int, int, int) line: 4224    relativelayout.onlayout(boolean, int, int, int, int) line: 925   relativelayout(view).layout(int, int, int, int) line: 11282  relativelayout(viewgroup).layout(int, int, int, int) line: 4224  linearlayout.setchildframe(view, int, int, int, int) line: 1628  linearlayout.layouthorizontal() line: 1617   linearlayout.onlayout(boolean, int, int, int, int) line: 1401    linearlayout(view).layout(int, int, int, int) line: 11282    linearlayout(viewgroup).layout(int, int, int, int) line: 4224    swipeview(framelayout).onlayout(boolean, int, int, int, int) line: 431   swipeview(horizontalscrollview).onlayout(boolean, int, int, int, int) line: 1382     swipeview.onlayout(boolean, int, int, int, int) line: 154    swipeview(view).layout(int, int, int, int) line: 11282   swipeview(viewgroup).layout(int, int, int, int) line: 4224   linearlayout.setchildframe(view, int, int, int, int) line: 1628  linearlayout.layoutvertical() line: 1486     linearlayout.onlayout(boolean, int, int, int, int) line: 1399    linearlayout(view).layout(int, int, int, int) line: 11282    linearlayout(viewgroup).layout(int, int, int, int) line: 4224    framelayout.onlayout(boolean, int, int, int, int) line: 431  framelayout(view).layout(int, int, int, int) line: 11282     framelayout(viewgroup).layout(int, int, int, int) line: 4224     linearlayout.setchildframe(view, int, int, int, int) line: 1628  linearlayout.layoutvertical() line: 1486     linearlayout.onlayout(boolean, int, int, int, int) line: 1399    linearlayout(view).layout(int, int, int, int) line: 11282    linearlayout(viewgroup).layout(int, int, int, int) line: 4224    phonewindow$decorview(framelayout).onlayout(boolean, int, int, int, int) line: 431   phonewindow$decorview(view).layout(int, int, int, int) line: 11282   phonewindow$decorview(viewgroup).layout(int, int, int, int) line: 4224   viewrootimpl.performtraversals() line: 1514  viewrootimpl.handlemessage(message) line: 2467   viewrootimpl(handler).dispatchmessage(message) line: 99  looper.loop() line: 137  activitythread.main(string[]) line: 4424     method.invokenative(object, object[], class, class[], class, int, boolean) line: not available [native method]   method.invoke(object, object...) line: 511   zygoteinit$methodandargscaller.run() line: 784   zygoteinit.main(string[]) line: 551  nativestart.main(string[]) line: not available [native method]

the key part here docs is:

called layout when view should assign size , position each of children.

if view inside viewgroup set wrap_content , changes size (e.g. text inside textview changes longer string) onlayout in viewgroup occur. because views given size when laid out, without call view never given new size.


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