如何处理FirebaseInstanceId.getInstance（）。getToken（）= null [英] How to handle FirebaseInstanceId.getInstance().getToken() = null

问题描述

我刚刚迁移到FCM。我已经添加了我的类从FirebaseInstanceIdService扩展到接收适当refreshedToken。

我的问题是特定于用户第一次安装我的应用程序，由于某些原因，无法从onTokenRefresh收到注册ID。我们该如何处理呢？我可以从我的FirebaseInstanceIdService类中设置一个广播接收器，它会在收到注册标识时通知主要活动？

解决方案

• 如果您的设备没有连接到互联网 onTokenRefresh（）永远不会被呼叫，您应该通知用户他/她的设备没有互联网连接


• firebase拥有自己的网络更改监听器，当连接到互联网的设备尝试获取令牌并返回时，此时可以通过向本地广播接收器发送注册令牌来告诉您的主要活动。 >
  

使用以下代码：

  @Override 
 public void onTokenRefresh（）{
 
 //获取更新的InstanceID标记。 
 String refreshedToken = FirebaseInstanceId.getInstance（）。getToken（）; 
 
 Log.d（FCN TOKEN GET，刷新标记：+刷新标记）; 
 
 final Intent intent = new Intent（tokenReceiver）; 
 //你也可以包含一些额外的数据。 
 final LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance（this）; 
 intent.putExtra（token，refreshedToken）; 
 broadcastManager.sendBroadcast（intent）; 
 
 $ b} 
  

在您的主要活动中：

  public class MainActivity extends AppCompatActivity {
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_splash）; 
 LocalBroadcastManager.getInstance（this）.registerReceiver（tokenReceiver，
 new IntentFilter（tokenReceiver））; 
 
 
 $ b BroadcastReceiver tokenReceiver = new BroadcastReceiver（）{
 @Override 
 public void onReceive（Context context，Intent intent）{
 String token = intent.getStringExtra（token）; 
 if（token！= null）
 {
 //发送令牌给你的服务器或你想做什么
} 
 
} 
}; 
 
} 
  

I have just migrated to FCM. I have added my class that extends from FirebaseInstanceIdService to receive a refreshedToken as and when appropriate.

My question is specific to the case when user installs my app first time and due to some reason, unable to receive a registration Id from onTokenRefresh. How are we supposed to handle this? Can I set a broadcast receiver from my FirebaseInstanceIdService class which will notify the Main activity when a registration Id is received?

解决方案

• if your device have no connection to the internet onTokenRefresh() is never called and you should notify to user his/her device has no internet connection
• firebase has it's own network change listener and when a device connected to the internet then try to get token and return it,at this time you can tell your main activity by sending a local broadcast receiver that registration token is received.

use below codes:

    @Override
public void onTokenRefresh() {

    // Get updated InstanceID token.
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();

    Log.d("FCN TOKEN GET", "Refreshed token: " + refreshedToken);

    final Intent intent = new Intent("tokenReceiver");
    // You can also include some extra data.
    final LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(this);
    intent.putExtra("token",refreshedToken);
    broadcastManager.sendBroadcast(intent);


}

in your main activity:

    public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);
   LocalBroadcastManager.getInstance(this).registerReceiver(tokenReceiver,
            new IntentFilter("tokenReceiver"));

}

BroadcastReceiver tokenReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String token = intent.getStringExtra("token");
        if(token != null)
        {
            //send token to your server or what you want to do
        }

    }
};

}

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