android - How to override setImageResource correctly so that it keeps the rotation of an ImageButton? -

i have created custom view class extends imagebutton. did because there new button class allowed me animations.

the actual problem have following: when click on button, want change image drawable. however, when set new image this

private void setcustombuttonicon() {     if (menabled) {         mycustombutton.setimageresource(r.drawable.mybutton_off);     } else {         mycustombutton.setimageresource(r.drawable.mybutton_on);     } } 

then rotation had, since may have been rotated during animation, not preserved.

now, obvious idea override setimageresource in custom button class. how can rotation of button preserved?

i think problem related issue:

most likely, using animation class animations. used rotationanimation superclass, did

rotateanimation animation = new rotateanimation(     fromdegrees, todegress, pivotx, pivoty); 

and applied animation custom button.

however, turns out, only animates bitmap representation of button. or, in other words, actual button/ view not rotated , remains in orientation.

therefore, every call ondraw(), happens when click on button, "reset look" of button.

so, want use objectanimator. animate whole view , fix problem preserving state of object.

you can use animator this, example:

objectanimator.offloat(mybutton, "rotation", fromdegrees, -todegrees)             .setduration(animationduration)             .start(); 

note: objectanimator added in api 11. if targeting older versions should use jake whartons nineoldandroids library. (download .jar file , add libs folder in project.)