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[英]How to get user info in FirebaseDatabase when user successfully sign in with google?
[英]How to get FirebaseDataBase Snapshot from current user?
private fun getUserInfo() {
val userkey = FirebaseAuth.getInstance().uid ?: ""
val ref = FirebaseDatabase.getInstance().getReference("/users/$userkey")
ref.addListenerForSingleValueEvent(object: ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val adapter = GroupAdapter<ViewHolder>()
p0.children.forEach {
Log.d("getUserInfo", it.toString())
val user = it.getValue(User::class.java)
if (user != null) {
adapter.add(UserItem(user))
}
}
UserInfo_RCView.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
}
})
}
}
class UserItem(val user: User): Item<ViewHolder>() {
override fun bind(viewHolder: ViewHolder, position: Int) {
viewHolder.itemView.UsernameSettings_txt.text = user.username
Picasso.get().load(user.profileImageUrl).into(viewHolder.itemView.ProfileImage_View)
}
override fun getLayout(): Int {
return R.layout.userinfo
}
}
我想像這樣從當前用戶制作快照,每次將$userkey
放入ref值時,應用都會因以下錯誤而崩潰:
2018-11-23 22:04:48.414 3871-3871 / my.app E / RecyclerView:未連接適配器; 跳過布局2018-11-23 22:04:49.797 3871-3871 / my.app E / AndroidRuntime:致命例外:主進程:nobrand.ljb.musicshare,PID:3871 com.google.firebase.database.DatabaseException:可以t將類型為java.lang.String的對象轉換為類型myapp.User
當我沒有將$userkey
放入我的參考值時。 該應用程序正常運行,可以按預期顯示所有用戶,但是正如我所說,我不希望那樣。 我會很感激每一個答案和建議!
如果您直接訪問正確的子節點,則不再需要代碼中的循環。
這意味着有兩種簡單的方法可以做到這一點:
我建議刪除循環,因為實際上不再需要它了,但是想顯示兩個選項。
val ref = FirebaseDatabase.getInstance().getReference("/users")
ref.orderByKey().equalTo(userkey).addListenerForSingleValueEvent(object: ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val adapter = GroupAdapter<ViewHolder>()
p0.children.forEach {
Log.d("getUserInfo", it.toString())
val user = it.getValue(User::class.java)
if (user != null) {
adapter.add(UserItem(user))
}
}
UserInfo_RCView.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
throw p0.toException();
}
})
val ref = FirebaseDatabase.getInstance().getReference("/users/$userkey")
ref.addListenerForSingleValueEvent(object: ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val adapter = GroupAdapter<ViewHolder>()
val user = p0.getValue(User::class.java)
if (user != null) {
adapter.add(UserItem(user))
}
UserInfo_RCView.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
throw p0.toException();
}
})
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