AnimationService.java 文件源码

public static void setActivityToolbarReset(Toolbar aMainToolbar, Toolbar aDecorativeToolbar, Activity aActivity, float fromToolbarPosition, float fromMainToolbarPosition) {
    final int TOOLBAR_TRANSLATION_DURATION = 700;
    float DECORATIVE_TOOLBAR_HEIGHT = -1 * aActivity.getResources().getDimension(R.dimen.additional_toolbar_height);
    if(fromMainToolbarPosition == 0) {
        DECORATIVE_TOOLBAR_HEIGHT += aActivity.getResources().getDimension(R.dimen.main_toolbar_height);
    } else {
        Animation moveMainToolbarAnimation = new TranslateAnimation(0, 0, fromMainToolbarPosition, 0);
        moveMainToolbarAnimation.setInterpolator(new AccelerateDecelerateInterpolator());
        moveMainToolbarAnimation.setDuration(TOOLBAR_TRANSLATION_DURATION);

        aMainToolbar.startAnimation(moveMainToolbarAnimation);
    }
    float fromTranslationY = (fromToolbarPosition < DECORATIVE_TOOLBAR_HEIGHT) ? DECORATIVE_TOOLBAR_HEIGHT : fromToolbarPosition;

    Animation moveToolbarAnimation = new TranslateAnimation(0, 0, fromTranslationY, 0);
    moveToolbarAnimation.setInterpolator(new AccelerateDecelerateInterpolator());
    moveToolbarAnimation.setDuration(TOOLBAR_TRANSLATION_DURATION);

    aDecorativeToolbar.startAnimation(moveToolbarAnimation);
}