android - RecyclerView predictive item animations not working (APPEARING) -

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i have recyclerview gridlayoutmanager (support lib v7). update adapter , make notifyitemmoved. if item source position on screen , destination position on screen - "move animation" played. in case if item @ position out of screen(position 1000, or other far viewport) , moved viewport appear "fade in animation".

looks predictive item animations not working despite on fact supportspredictiveitemanimations() returns true. doing wrong? should override methods enable it?

i reading source code of recyclerview, , in javadoc of dispatchlayout method written like:

  • persistent views moved ({@link itemanimator#animatemove(viewholder, int, int, int, int)})
  • removed views removed ({@link itemanimator#animateremove(viewholder)})
  • added views added ({@link itemanimator#animateadd(viewholder)})
  • disappearing views moved off screen
  • appearing views moved on screen

nevertheless itemanimator doesn't distinguish added , appearing. possible fix predictife animations or @ least make appearing animation "move outside of screen animation" lefting added animation is?

you can try override getextralayoutspace(recyclerview.state state) of linearlayoutmanager provide manager space predictive animations.

example : 

@override protected int getextralayoutspace(recyclerview.state state) {     return getheight(); // add page better predictive animations }

the space added either @ start or @ end depending on previous scroll delta of scroll view. can take @ implementation of onlayoutchildren of linearlayoutmanager more details.


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