DrawerLayout动画关于

 ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, mDrawerLayout, mToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                //获取mDrawerLayout中的第一个子布局，也就是布局中的RelativeLayout
                //获取抽屉的view
                View mContent = mDrawerLayout.getChildAt(0);
                float scale = 1 - slideOffset;
                float endScale = 0.8f + scale * 0.2f;
                float startScale = 1 - 0.3f * scale;

                //设置左边菜单滑动后的占据屏幕大小
                drawerView.setScaleX(startScale);
                drawerView.setScaleY(startScale);
                //设置菜单透明度
                drawerView.setAlpha(0.6f + 0.4f * (1 - scale));

                //设置内容界面水平和垂直方向偏转量
                //在滑动时内容界面的宽度为 屏幕宽度减去菜单界面所占宽度
                mContent.setTranslationX(drawerView.getMeasuredWidth() * (1 - scale));
                //设置内容界面操作无效（比如有button就会点击无效）
                mContent.invalidate();
                //设置右边菜单滑动后的占据屏幕大小
                mContent.setScaleX(endScale);
                mContent.setScaleY(endScale);
            }
        };
        toggle.syncState();
        mDrawerLayout.addDrawerListener(toggle);
 //可以加效果
 switch (event) {

                    case Snackbar.Callback.DISMISS_EVENT_SWIPE:
                    case Snackbar.Callback.DISMISS_EVENT_CONSECUTIVE:
                    case Snackbar.Callback.DISMISS_EVENT_MANUAL:
                    case Snackbar.Callback.DISMISS_EVENT_TIMEOUT:
                        //TODO 网络操作
                        Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
                        break;
                    case Snackbar.Callback.DISMISS_EVENT_ACTION:
                        Toast.makeText(MainActivity.this, "撤销了删除操作", Toast.LENGTH_SHORT).show();
                        break;

                }