viewPager.setAdapter(adapter); 从这个https://www.javatpoint.com/android-tablayout#:~:text=Tabs%20are%20created%20using%20newTab,method%20addTab(Tab)%20method。 但仍然获取错误空对象引用: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.viewpager.widget.ViewPager....