fragment在activity里面实例化

private void initMenuFragment() {    MenuParams menuParams = new MenuParams();    menuParams.setActionBarSize((int) getResources().getDimension(R.dimen.tool_bar_height));    menuParams.setMenuObjects(getMenuObjects());    menuParams.setClosableOutside(false);    mMenuDialogFragment = ContextMenuDialogFragment.newInstance(menuParams);    mMenuDialogFragment.setItemClickListener(this);    mMenuDialogFragment.setItemLongClickListener(this);}