private void buildAnimation() {
        mFlipAnimation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        mFlipAnimation.setInterpolator(new LinearInterpolator());
        mFlipAnimation.setDuration(mRotateAniTime);
        mFlipAnimation.setFillAfter(true);

        mReverseFlipAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
        mReverseFlipAnimation.setDuration(mRotateAniTime);
        mReverseFlipAnimation.setFillAfter(true);
    }
Using an object to specify the last update time.

@param object
ptr-lib/src/in/srain/cube/views/ptr/PtrClassicDefaultHeader.java