Firebase - 如何在认证后为每个用户写入/读取数据 [英] Firebase - How to write/read data per user after authentication

问题描述

 <$ c $ 
 
我试图理解，但无法看到我登录后的数据是如何以及在哪里存储的。 c> public static final String BASE_URL =https://xyz.firebaseio.com; 
 
 Firebase ref =新的Firebase（FirebaseUtils.BASE_URL）; 
 ref.authWithPassword（[e-mail]，some_password，new Firebase.AuthResultHandler（）{
 $ b $ @Override 
 public void onAuthenticated（AuthData authData）{
 Toast.makeText（LoginActivity.this，Login Successful，Toast.LENGTH_SHORT）.show（）; 
 startActivity（new Intent（LoginActivity.this，MainActivity.class））; 
} 
 @Override 
 public void onAuthenticationError（FirebaseError firebaseError）{
} 
} 
  

在这一点上，我成功地进行身份验证，并着陆到 MainActivity 上，接下来在 onCreate of MainActivity 。我初始化 Firebase

 <$ c （）; $ c $ firebase = new Firebase（FirebaseUtils.BASE_URL）.child（box）; 
 
 //下面的适配器是一个ArrayAdapter提供的ListView 
 firebase.addChildEventListener（new ChildEventListener 
 @Override 
 public void onChildAdded（DataSnapshot dataSnapshot，String s ）{
 if（dataSnapshot.getValue（Box.class）instanceof Box）
 adapter.add（dataSnapshot.getValue（Box.class）.getName（））; 
 
 $ b @Override 
 public void onChildChanged（DataSnapshot dataSnapshot，String s）{
 adapter.remove（dataSnapshot.getValue（Box.class）.getName（） ）; 
} 
 
 //其他回调
} 
  

有一个添加按钮，我用来将新记录从Android推送到 Firebase 。

  final Button button =（Button）findViewById（R.id.addButton）; 
 button.setOnClickListener（new View.OnClickListener（）{
 public void onClick（View v）{
 Box box = new Box（Box+ System.currentTimeMillis（），Location Firebox fbBox = firebase.child（+ System.currentTimeMillis（））; 
 fbBox.setValue（box）; 
} 
} ）; 
  

但是上面的代码并没有添加任何记录（从 ListView 没有更新）或者至少我可能不知道在哪里查找数据。我检查了浏览器中的开放 Firebase ，但我不知道如何检查用户特定的数据？



我修改了我的 Firebase规则 like



  {
rules： {
users：{
$ uid：{
.write：auth！= null&&auth.uid == $ uid，
.read：auth！= null&& auth.uid == $ uid
} 
} 
} 
} 
  

我尝试打开网址，例如


I have tried to understand but not able to see how and where might be the data I am storing after login is going.

public static final String BASE_URL = "https://xyz.firebaseio.com";

Firebase ref = new Firebase(FirebaseUtils.BASE_URL);
    ref.authWithPassword("[e-mail]", "some_password", new Firebase.AuthResultHandler() {

    @Override
    public void onAuthenticated(AuthData authData) {
        Toast.makeText(LoginActivity.this, "Login Successful", Toast.LENGTH_SHORT).show();
        startActivity(new Intent(LoginActivity.this, MainActivity.class));
    }
    @Override
    public void onAuthenticationError(FirebaseError firebaseError) {
    }
}

At this point I am successfully authenticated and landed onto MainActivity. Next in onCreate of MainActivity. I initialize Firebase

firebase = new Firebase(FirebaseUtils.BASE_URL).child("box");

// adapter below is an ArrayAdapter feeding ListView
firebase.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        if (dataSnapshot.getValue(Box.class) instanceof Box)
            adapter.add(dataSnapshot.getValue(Box.class).getName());
    }

    @Override
    public void onChildChanged(DataSnapshot dataSnapshot, String s) {
        adapter.remove(dataSnapshot.getValue(Box.class).getName());
    }

    // other callbacks
}

There is a add button that I used to push new records from Android to Firebase.

final Button button = (Button) findViewById(R.id.addButton);
button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Box box = new Box("Box " + System.currentTimeMillis(), "Location " + System.currentTimeMillis());
        Firebase fbBox = firebase.child("" + System.currentTimeMillis());
        fbBox.setValue(box);
    }
});

But above code doesn't add any record (evident from ListView that is not updated) or atleast I might not know where to look for the data. I checked opening Firebase in browser, but I am not sure how to check for user specific data?

I modified my Firebase Rules like

{
    "rules": {
      "users": {
        "$uid": {
          ".write": "auth != null && auth.uid == $uid",
          ".read": "auth != null && auth.uid == $uid"
        }
      }
    }
}

I tried to open URLs such as https://xyz.firebaseio.com/xxxxxx-xxxxx-xxxx-xxxxx-xxxxxxxxxxxx but it wouldn't show any data.

I would like to have some information on:

1. How to add user specific data after authentication. Can't it be seamless like when we don't have any restriction on read/write on user basis, because I could easily read/write data.

2. Is there any Firebase web view to visualize the database or see JSON data, where I can see/modify the data to/from Android device?

解决方案

First, modify the Firstbase rules:

{
  "rules": {
    "users": {
      "$uid": {
        ".write": "$uid === auth.uid",
        ".read": "$uid === auth.uid"
      }
    }
  }
}

Then, in Java Code:

Firebase rootRef = new Firebase("https://user-account.firebaseio.com/");
// Assuming the user is already logged in.
Firebase userRef = rootRef.child("users/" + rootRef.getAuth().getUid());
userRef.child("message1").setValue("Hello World");

In the end, the data would look something like this:

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