android - Google Firestore 保存用户输入 Kotlin

Question

这个问题我已经困扰了一段时间了。我有 3 个 inputEditText，要求用户输入他们的名字、姓氏和 ID。我想将此信息保存到 google firestore 中。我已经设置了所有依赖项，并且我知道我已将其正确连接到 google firebase。我发现的问题是，关于这个主题的每个教程都彼此不同，而且我能找到的每个教程都不能 100% 发挥作用。有没有办法将这 3 个值保存到 kotlin 中的 google firestore 中，并在另一个 Activity 中检索这些值？

Answer 1

I've been having this issue for a while. I have 3 inputEditTexts that ask the user to input their first name, last name, and their ID.

要从这些 EditText 对象获取数据，请使用以下代码行:

val firstName =  firstNameEditText.text.toString().trim()
val lastName =  lastNameEditText.text.toString().trim()
val id =  idEditText.text.toString().trim()

I wanted to save this information into Firestore.

要将数据保存在 Firestore 中，最简单的解决方案是创建一个数据类:

data class User(
    var firstName: String? = null,
    var lastName: String? = null,
    var id: String? = null
)

创建该类的对象:

val user = User(firstName, lastName, id)

并将其写入 Firestore:

val rootRef = FirebaseFirestore.getInstance()
val usersRef = rootRef.collection("users")
usersRef.document(id).set(user).addOnCompleteListener(/* ... */)

这将产生以下数据库架构:

Firestore-root
  |
  --- users (collection)
       |
       --- $id
            |
            --- firstName: "Abrahim"
            |
            --- lastName: "Mahmud"
            |
            --- id: "userIdIntroducedFromKeyboard"

要读回数据，只需调用 get() 并附加一个监听器，如下所示:

val uidRef = usersRef.document(id)
uidRef.get().addOnSuccessListener { doc ->
    if (doc != null) {
        val user = doc.toObject(User::class.java)
        Log.d(TAG, "{$user.firstName} {$user.lastName}")
    } else {
        Log.d(TAG, "No such document")
    }
}.addOnFailureListener { exception ->
    Log.d(TAG, "get failed with ", exception)
}

logcat 中的结果将是:

Abrahim Mahmud