Android：如何使用signInWithCustomToken自动诱使Firestore并监听/观察特定集合中的文档更改

我知道如何使用signInWithCustomToken进行自动验证，但我不知道如何在Android中侦听/观察文档更改。我知道如何做它的角度，所以我将粘贴贝娄只是举例说明

如果我关闭Firestore规则验证，我可以使用

val db = FirebaseFirestore.getInstance()
db.collection("transfer")
    .get()
    .addOnSuccessListener { result ->
        for (document in result) {
            Log.d(TAG, "${document.id} => ${document.data}")
        }
    }
    .addOnFailureListener { exception ->
        Log.w(TAG, "Error getting documents.", exception)
    }

但我需要在Firestore中保持Auth正常运行

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {

    match /{document=**} {
      allow read, update, write: if request.auth.uid != null;
    }
  }
}

我知道如何在Android中使用CustomToken进行连接

      lateinit var auth: FirebaseAuth// ...
        auth = FirebaseAuth.getInstance()


        auth.signInWithCustomToken("eyJhbGc 
*** a valid customtoken *** Wi3KcvX4ILYN7kWySB4uuDtoNE_rIvXvD7VOpvCuLZ65d5lJHTBRhfAKJMiKyokQbWTZQ1GkQ")
            .addOnCompleteListener(this) { task ->
                if (task.isSuccessful) {
                    // Sign in success, update UI with the signed-in user's information
                    Log.d(TAG, "signInWithCustomToken:success")
                    val user = auth.currentUser
                    //updateUI(user)
                } else {
                    // If sign in fails, display a message to the user.
                    Log.w(TAG, "signInWithCustomToken:failure", task.exception)
                    Toast.makeText(baseContext, "Authentication failed.",
                        Toast.LENGTH_SHORT).show()
                    //updateUI(null)
                }
            }

但我在FirebaseAuth中看不到允许我设置集合和listen/obeser/snapshot以利用Firestore的真实数据库功能进行更改的方法

为了举例说明我在Android/Kotlin中所做的工作，下面是我如何使用Angular快照和customtoken成功实现它的

import { Component } from '@angular/core';
import { Observable } from 'rxjs';
import { AngularFirestore, AngularFirestoreCollection } from '@angular/fire/firestore';

import { HttpClient, HttpHeaders } from '@angular/common/http';
import { map } from 'rxjs/operators';
import 'rxjs/Rx';

import { AngularFireAuth } from '@angular/fire/auth';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html'
})
export class AppComponent {
  public transfers: Observable<any[]>;

  transferCollectionRef: AngularFirestoreCollection<any>;

  constructor(public auth: AngularFireAuth, public db: AngularFirestore) {
    this.listenSingleTransferWithToken();
  }


  async listenSingleTransferWithToken() {
    await this.auth.signInWithCustomToken("ey *** valid customtoken *** daG1Q");
    this.transferCollectionRef = this.db.collection<any>('transfer', ref => ref.where("id", "==", "1"));
    this.transfers = this.transferCollectionRef.snapshotChanges().map(actions => {
      return actions.map(action => {
        const data = action.payload.doc.data();
        const id = action.payload.doc.id;
        return { id, ...data };
      });
    });

  }

***编辑

***找到当前解决方案。由于这是我在Firestore/Android中的第一个项目，任何推荐都将不胜感激。顺便说一句，这是有效的：

package com.example.demo
//https://developer.android.com/training/basics/firstapp/starting-activity
//https://firebase.google.com/docs/firestore/quickstart#kotlin+ktx

// Tutorial to CustomToken
//https://firebase.google.com/docs/auth/android/custom-auth#kotlin+ktx

//Tutorial to Snatshot Listeners and its queries
//https://firebase.google.com/docs/firestore/query-data/listen#kotlin+ktx

import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.firestore.FirebaseFirestore

class MainActivity : AppCompatActivity() {

    lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {
        val TAG = "MainActivity"
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        auth = FirebaseAuth.getInstance()

        auth.signInWithCustomToken("eyJ **** uXa-CSuHUrg")
            .addOnCompleteListener(this) { task ->
                if (task.isSuccessful) {
                    Log.d(TAG, "*** signInWithCustomToken:success")
                } else {
                    // If sign in fails, display a message to the user.
                    Log.w(TAG, "signInWithCustomToken:failure", task.exception)
                    Toast.makeText(
                        baseContext, "Authentication failed.",
                        Toast.LENGTH_SHORT
                    ).show()
                }
            }

        //val db = FirebaseFirestore.getInstance()

        FirebaseFirestore.getInstance().collection("transfer")
            .whereEqualTo("id", "1")
            .addSnapshotListener { value, e ->
                if (e != null) {
                    Log.w(TAG, "Listen failed.", e)
                    return@addSnapshotListener
                }

                val transfer = ArrayList<String>()
                for (doc in value!!) {
                    doc.getString("status")?.let {
                        transfer.add(it)
                    }
                }
//                for (document in value) {
//                    Log.d(TAG, "${document.id} => ${document.data}")
//                }
                Log.d(TAG, "*** transfer: $transfer")
            }
    }

}

目前的工作方案：

---

对于身份验证和自定义令牌，您可以在使用Kotlin的Android上查看以下内容。另一个将向您展示如何在CloudFireStore中使用Kotlin实现任何实时更新的侦听器。希望能有帮助。@sllopis，谢谢，但我还是被卡住了。如果您注意到我的问题，这表明我知道如何使用CustomToken auth.signInWithCustomToken.addOnCompleteListener登录，但我可以添加快照侦听器。我需要一些方法，比如在我使用CustomToken登录后进行快照更改，而您建议的两个链接都没有显示出来how@sllopis我刚刚从Android Studio添加了一个打印屏幕，显示CustomToken有效且已登录。但是倾听/观察/快照是如何改变收藏文档的呢？@sllopis非常感谢你。经过多次尝试，我终于成功了。我可以请你看看我是不是在做什么奇怪的事吗？首先，我使用FirebaseAuth.getInstance.signInWithCustomTokenmy cutsomtoken.addOnCompleteListener，其次使用FirebaseAuth.getInstance.collectiontransfer.whereEqualToid，1.addSnapshotListener。考虑到Firestore Customtoken的最佳实践，您是否看到了一些奇怪的事情？请参阅上面的完整代码。也许你可以将你的第一个评论设置为答案，这样我就可以选择它了。我很高兴你让它工作了。signInWithCustomToken方法和addSnapshotListener observable看起来都不错。顺便说一句，我发布了你当前的工作代码作为答案，所以其他用户可以从这篇文章中受益。谢谢

package com.example.demo
//https://developer.android.com/training/basics/firstapp/starting-activity
//https://firebase.google.com/docs/firestore/quickstart#kotlin+ktx

// Tutorial to CustomToken
//https://firebase.google.com/docs/auth/android/custom-auth#kotlin+ktx

//Tutorial to Snatshot Listeners and its queries
//https://firebase.google.com/docs/firestore/query-data/listen#kotlin+ktx

import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.firestore.FirebaseFirestore

class MainActivity : AppCompatActivity() {

    lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {
        val TAG = "MainActivity"
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        auth = FirebaseAuth.getInstance()

        auth.signInWithCustomToken("eyJ **** uXa-CSuHUrg")
            .addOnCompleteListener(this) { task ->
                if (task.isSuccessful) {
                    Log.d(TAG, "*** signInWithCustomToken:success")
                } else {
                    // If sign in fails, display a message to the user.
                    Log.w(TAG, "signInWithCustomToken:failure", task.exception)
                    Toast.makeText(
                        baseContext, "Authentication failed.",
                        Toast.LENGTH_SHORT
                    ).show()
                }
            }

        //val db = FirebaseFirestore.getInstance()

        FirebaseFirestore.getInstance().collection("transfer")
            .whereEqualTo("id", "1")
            .addSnapshotListener { value, e ->
                if (e != null) {
                    Log.w(TAG, "Listen failed.", e)
                    return@addSnapshotListener
                }

                val transfer = ArrayList<String>()
                for (doc in value!!) {
                    doc.getString("status")?.let {
                        transfer.add(it)
                    }
                }
//                for (document in value) {
//                    Log.d(TAG, "${document.id} => ${document.data}")
//                }
                Log.d(TAG, "*** transfer: $transfer")
            }
    }

}