菜单的隐藏与现实（旋转）

public static void hider(ViewGroup v) {
hider(v,0);
}
public static void hider(ViewGroup v,int startOffset) {
//        RotateAnimation ra = new RotateAnimation(0,180,v.getWidth()/2,v.getHeight());
//        ra.setDuration(4000);
//        ra.setFillAfter(true);
//        ra.setStartOffset(startOffset);
//        v.startAnimation(ra);
//        for (int i = 0; i<v.getChildCount();i++){
//            View children = v.getChildAt(i);
//            children.setEnabled(false);
//        }

ObjectAnimator ani = ObjectAnimator.ofFloat(v,"rotation",0,180);
v.setPivot
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X(v.getWidth()/2);
v.setPivotY(v.getHeight());
ani.setDuration(500);
ani.setStartDelay(100);
ani.start();
}
public static void show(ViewGroup v) {
show(v,0);
}
public static void show(ViewGroup v,int startOffset) {
//        RotateAnimation ra = new RotateAnimation(180,360,v.getWidth()/2,v.getHeight());
//        ra.setDuration(4000);
//        ra.setFillAfter(true);
//        ra.setStartOffset(startOffset);
//        v.startAnimation(ra);
//        for (int i = 0; i<v.getChildCount();i++){
//            View children = v.getChildAt(i);
//            children.setEnabled(true);
//        }
ObjectAnimator ani = ObjectAnimator.ofFloat(v,"rotation",180,360);
v.setPivotX(v.getWidth()/2);
v.setPivotY(v.getHeight());
ani.setDuration(500);
ani.setStartDelay(100);
ani.start();
}