registerDefaultNetworkCallback 和 registerNetworkCallback 的区别 [英] Difference between registerDefaultNetworkCallback and registerNetworkCallback

问题描述

我遇到了 registerDefaultNetworkCallback 和 registerNetworkCallback 同时为 API 28 更新我的 Android 应用程序.

查看文档后，我找不到注册网络回调和注册默认网络回调之间的区别.

什么时候用哪个?

提前致谢:)

解决方案

据我了解，registerDefaultNetworkCallback 和 registerNetworkCallback 的区别只是基于自定义.
registerDefaultNetworkCallback (令人惊讶地)作为默认网络侦听器工作，而 registerNetworkCallback 它更具可配置性.例如:

 val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManagerval builder = NetworkRequest.Builder()builder.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)val networkRequest = builder.build()连接管理器.registerNetworkCallback(networkRequest,对象:ConnectivityManager.NetworkCallback () {覆盖有趣的可用(网络:网络?){super.onAvailable(网络)Log.i("测试", "网络可用")}覆盖 fun onLost(network: Network?) {super.onLost(网络)Log.i("测试", "连接丢失")}})

这里的 onAvailable 只有当用户连接到蜂窝网络时才会被调用(通过连接到 WiFi 它不会记录任何内容).与蜂窝网络断开连接时，onLost 也是如此.

如果我们这样做:

 connectivityManager.registerDefaultNetworkCallback(object : ConnectivityManager.NetworkCallback() {覆盖有趣的可用(网络:网络?){super.onAvailable(网络)Log.i("测试", "默认 -> 网络可用")}覆盖 fun onLost(network: Network?) {super.onLost(网络)Log.i("测试", "默认 -> 连接丢失")}})

当用户连接(或断开)网络(可以是 WiFi 或蜂窝网络)时，这两个函数都用作默认回调.

这些只是一些非常基本的例子.当然NetworkRequest可以通过设置capability或者transportType进行很多配置.您可以在 NetworkRequest 的官方文档中阅读更多相关信息.p>

I came across registerDefaultNetworkCallback and registerNetworkCallback while updating my Android app for API 28.

Having reviewed the documentation, I cannot find the difference between registering a network callback and registering a default network callback.

When will one use which?

Thanks in advance :)

解决方案

As far as I understood, the difference between registerDefaultNetworkCallback and registerNetworkCallback it's only based on customisation.
registerDefaultNetworkCallback works (surprisingly) as a default network listener, while registerNetworkCallback it's more configurable. For example:

    val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager

    val builder = NetworkRequest.Builder()
    builder.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)

    val networkRequest = builder.build()
    connectivityManager.registerNetworkCallback(networkRequest, 
    object : ConnectivityManager.NetworkCallback () {
        override fun onAvailable(network: Network?) {
            super.onAvailable(network)
            Log.i("Test", "Network Available")
        }

        override fun onLost(network: Network?) {
            super.onLost(network)
            Log.i("Test", "Connection lost")
        }
    })

Here onAvailable will be called only if the user connects to a cellular network (by connecting to WiFi it won't log anything). The same does onLost when disconnecting from cellular network.

If we do it like this:

    connectivityManager.registerDefaultNetworkCallback(object  : ConnectivityManager.NetworkCallback() {
        override fun onAvailable(network: Network?) {
            super.onAvailable(network)
            Log.i("Test", "Default -> Network Available")
        }

        override fun onLost(network: Network?) {
            super.onLost(network)
            Log.i("Test", "Default -> Connection lost")
        }
    })

Both functions work as default callbacks when the user is connecting (or disconnecting) to/from a network (it can be either WiFi or cellular).

These are just some very basic examples. Of course NetworkRequest can have a lot of configurations by setting its capability or transportType. You can read more about these in the official documentation of NetworkRequest.

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