在高图表示例中，我无法理解这一行代码
select id, name from target where updated_at = "val1", "val2","val3"
来自此页面 http://jsfiddle.net/d_paul/supgh9c1/4/
任何人都可以提供它的简要说明吗？
答案 0 :(得分：3)
这是三元运算符，或者更简单地是一行override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View = inflater.inflate(R.layout.fragment_home, container, false)
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
lrMath.setOnClickListener {
val matematikaIntent = Intent(requireActivity(), MathActivity::class.java)
requireActivity().startActivity(matematikaIntent)
}
fetchUser()
}
.
.
.
private fun fetchUser() {
val uid = FirebaseAuth.getInstance().currentUser?.uid
val ref = FirebaseDatabase.getInstance().getReference("/users")
ref.addListenerForSingleValueEvent(object : ValueEventListener {
@SuppressLint("SetTextI18n")
override fun onDataChange(p0: DataSnapshot) {
p0.children.forEach {
val user = it.getValue(User::class.java)
if (user != null && uid == user.uid) {
textGreetings = "Hi " + user.name + ","
Picasso.get().load(user.profileImageUrl).into(profile_button)
greetings_textview.text = textGreetings
flag = 1
}
}
}
override fun onCancelled(p0: DatabaseError) {
}
}
)
}
。一样是
if-else