java - conditionally implement an interface -


so i'm trying animations in app , had way without using objectanimator , animatorlistener api 11. however, they're not smooth , robust doing animations using classes.

so made changes code in object's class check api level, objectanimator , animatorlistener stuff wouldn't called unless api level 11+.

the problem object implementing animatorlistener though functionality isn't being used in versions of code. think leading verifyerror on start of app because crashes on devices api level 10 , down.

is there way conditionally implement interface based on api level or different way achieve same thing?

thanks!

actually, ok if build against or higher sdk target, issue when code run on device missing classes higher sdk. others suggested, can go factory

public class factory {   public static <t> t getimplementation(){     if(<sdk_level_incompatible>){       return (t)new <package>.oldschoolanimator();     }else{       return (t)new <package>.superanimator();     }   } }   ... someimplementation impl = new factory().getimplementation(); ...

watchout, "someimplementation" has common super-type or interface of oldschoolanimator , superanimator classes! dont use "imports" implementation classes in factory, rather use full-qualified classnames.


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

qt - Errors in generated MOC files for QT5 from cmake -

i generated moc files qt5 using set (cmake_automoc on) set(cmake_include_current_dir on) then add moc files src using set(src src/main.cpp src/video_widget_surface.cpp src/video_widget.cpp src/video_player.cpp #moc files moc/moc_video_player.cpp moc/moc_video_widget.cpp moc/moc_video_widget_surface.cpp finally add executable using add_executable(somegui ${src}) but errors in moc files saying : /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:54:6: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:62:19: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:20: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:46: error: non-member function 'const qmetaobject* metaobject()' cannot have cv-qualifier /other/qt5.0.1/5.0.1/gcc_64/include/qtcore/qo...
Read more