如何将Firebase参考转移到另一个Android活动 [英] How to transfer the Firebase reference to another android activity

问题描述

我们有2个Android活动(活动A和活动B)

We have 2 Android activities (activity A and activity B)

假设我们在活动A中实例化了Firebase引用.活动A还处理所有用户身份验证(Facebook，Google和电子邮件/密码).

Suppose that we instantiated a Firebase reference in activity A. Activity A also handles all user authentication (Facebook, Google, and email/password).

活动B(使用Android意向从活动A启动)应使用Firebase引用来访问Firebase服务器上的某些数据.

Activity B, which is started from activity A using an Android intent, should use the Firebase reference to access some data on the Firebase servers.

现在，我想知道将活动A的Firebase引用发送到活动B的最佳设计是什么.

Now I was wondering what the best design is to send the Firebase ref from activity A to activity B.

1. 使用Java Serializable将Firebase引用与意图捆绑在一起，并在活动B中使用intent.getExtra()

1. Bundle the Firebase reference with the intent using Java Serializable and use intent.getExtra() in Activity B

使用Android Parcelable将Firebase引用与意图捆绑在一起，并在活动B中使用intent.getExtra()

Bundle the Firebase reference with the intent using Android Parcelable and use intent.getExtra() in activity B

在Android服务中启动Firebase引用，并将每个活动绑定到该服务

Initiate the Firebase reference in a Android service and bind each activity to that service

还有其他事情.

推荐答案

执行此操作的常用方法是将数据的URL传递给新活动.参见例如 Firebase Android绘图示例中的此方法:

The common way to do this is to pass the URL for the data to the new activity. See for example this method from the Firebase Android Drawing sample:

private void openBoard(String key) {
    Log.i(TAG, "Opening board "+key);
    Toast.makeText(BoardListActivity.this, "Opening board: "+key, Toast.LENGTH_LONG).show();
    Intent intent = new Intent(this, DrawingActivity.class);
    intent.putExtra("FIREBASE_URL", FIREBASE_URL);
    intent.putExtra("BOARD_ID", key);
    startActivity(intent);
}

然后，新活动读取URL并构造一个新的Firebase引用:

The new activity then reads the URL and constructs a new Firebase reference:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Intent intent = getIntent();
    final String url = intent.getStringExtra("FIREBASE_URL");
    final String boardId = intent.getStringExtra("BOARD_ID");
    Log.i(TAG, "Adding DrawingView on "+url+" for boardId "+boardId);
    mFirebaseRef = new Firebase(url);

这些调用之间确实保持了身份验证状态. Firebase SDK为应用程序会话维护与服务器的单个连接，每个Firebase引用都是基于此的轻量级引用.

The authentication state is indeed maintained between these calls. The Firebase SDK maintains a single connection to the server for an application session and each Firebase reference is a lightweight reference on top of that.

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