在Kotlin上使用Cloud Firestore设置全局变量

object GlobalVariables {
    var myVariable: String = ""
}

GlobalVariables.myVariable = "Hello, World!"

val db = FirebaseFirestore.getInstance()

val documentRef = db.collection("globalVariables").document("myVariable")
documentRef.set(mapOf("value" to GlobalVariables.myVariable))

val documentRef = db.collection("globalVariables").document("myVariable")
documentRef.get()
    .addOnSuccessListener { document ->
        if (document != null && document.exists()) {
            val value = document.getString("value")
            GlobalVariables.myVariable = value ?: ""
        }
    }
    .addOnFailureListener { exception ->
        // 处理获取数据失败的情况
    }