小编Gav*_*nan的帖子

我将菜单抽屉用作清单，并且 onDrawerClosed 根据 int 值将向用户收费或不保存更改。但是 onDrawerClosed 方法调用了两次，一次使用 int 和正确的值，一次使用 int 和值 0？这导致我的程序同时调用 if 和 else 语句，以便保存更改并提示他们付款。

//Used so that when drawer closed banned list saves
public void drawerListener(){
    mDrawer.addDrawerListener(new DrawerLayout.DrawerListener() {
        @Override
        public void onDrawerSlide(View drawerView, float slideOffset) {
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            customAdaptor.clearJustChanged();
        }

        @Override
        public void onDrawerClosed(View drawerView) {
            System.out.println("Cost of Changes:" + customAdaptor.getUserCostOfChange());
            if (customAdaptor.getUserCostOfChange() > 0) {
                getBuyAlert(customAdaptor.getUserCostOfChange());
                customAdaptor.setUserCostOfChange(0);
            }
            else {
                bannedList = customAdaptor.getBannedList();
                databaseReference.child("BannedApps").setValue(bannedList);
            }
        }

        @Override
        public void onDrawerStateChanged(int newState) …