在您更改第二微调的内容，你需要调用 adapter2.notifyDataSetChanged（）。如果没有呼叫，用户界面​​不会与微调的新内容更新，你可能也有问题，引用的东西不存在了。

After you change the contents of the second Spinner, you need to call adapter2.notifyDataSetChanged(). Without that call, the UI won't update with the new contents of the Spinner, and you could also have problems referencing things that don't exist anymore.