FCM令牌何时到期？-WhendoesaFCMtokenexpire?

15  

it doesn't expire tho. it renews itself if one of the following happens.

它不会过期。如果发生下列情况之一，它会自行更新。

1. -The app deletes Instance ID
2. - 该应用删除实例ID
3. -The app is restored on a new device
4. - 该应用程序在新设备上恢复
5. -The user uninstalls/reinstall the app
6. - 用户卸载/重新安装应用程序
7. -The user clears app data.
8. - 用户清除应用数据。

Monitor token generation

监控令牌生成

The onTokenRefreshcallback fires whenever a new token is generated, so calling getToken in its context ensures that you are accessing a current, available registration token. Make sure you have added the service to your manifest, then call getToken in the context of onTokenRefresh, and log the value as shown:

每当生成新令牌时都会触发onTokenRefreshcallback，因此在其上下文中调用getToken可确保您正在访问当前可用的注册令牌。确保已将服务添加到清单中，然后在onTokenRefresh的上下文中调用getToken，并记录该值，如下所示：

@Override
public void onTokenRefresh() {
    // Get updated InstanceID token.
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();
    Log.d(TAG, "Refreshed token: " + refreshedToken);

    // If you want to send messages to this application instance or
    // manage this apps subscriptions on the server side, send the
    // Instance ID token to your app server.
    sendRegistrationToServer(refreshedToken);
}