SearchView去掉下划线

 SearchView calSearchView = (SearchView) findViewById(R.id.sv_search_text);

        if (calSearchView != null) {

            try {        //--拿到字节码

                Class<?> argClass = calSearchView.getClass();

                //--指定某个私有属性,mSearchPlate是搜索框父布局的名字

                Field ownField = argClass.getDeclaredField("mSearchPlate");

                //--暴力反射,只有暴力反射才能拿到私有属性

                ownField.setAccessible(true);

                View mView = (View) ownField.get(calSearchView);

                //--设置背景

                mView.setBackgroundColor(Color.TRANSPARENT);

            } catch (Exception e) {

                e.printStackTrace();

            }

        }