Android L "delightful" drawable transformations -


does google allow icon transitions such these created developer? or developers responsibility create such "delightful" transitions? i'd implement these in app.

specifically icons this

you can create animated icon using animateddrawable , bitmap-based frames. on l, can use animatedstatelistdrawable create stateful animations (such check box animation).

here animateddrawable example (actually implementation check box on l preview) using 15ms-long frames can started , stopped code:

<animation-list xmlns:android="http://schemas.android.com/apk/res/android">     <item android:duration="15" android:drawable="@drawable/my_icon_frame_000" />     ...additional frames... </animation-list>

and here animatedstatelistdrawable using animateddrawable transitions implement check box animation starts , stops automatically based on view state:

<animated-selector xmlns:android="http://schemas.android.com/apk/res/android">     <item android:state_enabled="false" android:state_checked="true">         <bitmap android:src="@drawable/btn_check_to_on_mtrl_015" android:tint="?attr/colorcontrolactivated" android:alpha="?attr/disabledalpha" />     </item>     <item android:state_enabled="false">         <bitmap android:src="@drawable/btn_check_to_on_mtrl_000" android:tint="?attr/colorcontrolnormal" android:alpha="?attr/disabledalpha" />     </item>     <item android:state_checked="true" android:id="@+id/on">         <bitmap android:src="@drawable/btn_check_to_on_mtrl_015" android:tint="?attr/colorcontrolactivated" />     </item>     <item android:id="@+id/off">         <bitmap android:src="@drawable/btn_check_to_on_mtrl_000" android:tint="?attr/colorcontrolnormal" />     </item>     <transition android:fromid="@+id/off" android:toid="@+id/on">         <animation-list>             <item android:duration="15">                 <bitmap android:src="@drawable/btn_check_to_on_mtrl_000" android:tint="?attr/colorcontrolnormal" />             </item>             ...additional frames...         </animation-list>     </transition>     <transition android:fromid="@+id/on" android:toid="@+id/off">         <animation-list>             <item android:duration="15">                 <bitmap android:src="@drawable/btn_check_to_off_mtrl_000" android:tint="?attr/colorcontrolactivated" />             </item>             ...additional frames...         </animation-list>     </transition> </animated-selector>

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