Question

我知道如何使用signInWithCustomToken来启动，但是我不知道如何在Android中监听/观察文档更改。我知道如何在Angular中做到这一点，所以我将粘贴波纹管作为示例。

如果我关闭Firestore Rule Auth，我可以使用

获取文档

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)
    }

但是我需要保持Firestore中的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;
    }
  }
}

我知道如何使用CustomToken在Android中进行连接

      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)
                }
            }

但是我看不到FirebaseAuth中的方法，该方法允许我利用Firestore的Real Database功能来设置我的收藏集以及侦听/听众/快照以进行更改。

只是为了举例说明我要在Android / Kotlin中进行的操作，这是我如何使用快照和自定义令牌通过Angular成功实现

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 };
      });
    });

  }

***已编辑

***找到当前解决方案。由于这是我在Firestore / Android中的第一个项目，因此我们将不胜感激任何建议。顺便说一句，这正在工作：

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")
            }
    }

}

Answer 1

当前可行的解决方案：

error: invalid conversion from ‘int’ to ‘int*’ [-fpermissive]

Android：如何使用signInWithCustomToken激活Firestore并侦听/观察特定集合中的文档更改

1 个答案: