选项1:使用boolean accountsAdded=false;，在需要时将其设置为true

Option #1: Use boolean accountsAdded=false;, setting it to true when needed

选项2:使用l.findViewById(R.id.accounts)并查看是否返回null

Option #2: Use l.findViewById(R.id.accounts) and see if that returns null

顺便说一句，如果R.layout.forms的根窗口小部件不是R.id.accounts View，您将崩溃，因此请通过addView()将view而不是item添加到l.

BTW, you will crash if the root widget of R.layout.forms is not the R.id.accounts View, so please add view, not item, to l via addView().