最近在更新之前的一些java代码到kotlin去，然后把原来的NetReciever更新为kotlin版本，然后as给了我以下的错误：

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wtf？这是什么情况，仔细把提示的文字阅读一遍。。。

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原来CONNECTIVITY_ACTION已经过时，这里官方推荐使用 requestNetwork,registerNetworkCallbackor registerDefaultNetworkCallback来替换原有的BroadcastReciever方案，既然如此，就尝试来改造一番。

首先根据不同的版本区分不同的监听方案

主方法

//网络变化监听器
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP){
    mConnectivityManager = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
    val networkCallbackImpl = NetworkCallbackImpl()
    mConnectivityManager.requestNetwork(NetworkRequest.Builder().build(),networkCallbackImpl)
}else{
    networkReceiver =  NetWorkReciever()
    val netFilter = IntentFilter()
    netFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION)
    registerReceiver(networkReceiver,netFilter)

}

NetworkCallbackImpl

@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
class NetworkCallbackImpl: ConnectivityManager.NetworkCallback() {


    val TAG = "NetworkCallbackImpl"

    override fun onAvailable(network: Network) {
        super.onAvailable(network)
        Log.i(TAG,"网络已链接")
    }

    override fun onLost(network: Network) {
        super.onLost(network)
        Log.i(TAG,"网络已断开")
    }


    override fun onCapabilitiesChanged(network: Network, networkCapabilities: NetworkCapabilities) {
        super.onCapabilitiesChanged(network, networkCapabilities)
        if (networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)) {
            when {
                //WIFFI
                networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> {
                    Log.i(TAG,"wifi已经连接")
                }
                //数据流量
                networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> {
                    Log.i(TAG,"数据流量已经连接")
                }
                else -> {
                    Log.i(TAG,"其他网络")
                }
            }
        }

    }
}

然后补充一下原来NetWorkReciever的代码

class NetWorkReciever:BroadcastReceiver() {

    companion object{
        const val TAG = "NetWork"
    }

    override fun onReceive(context: Context?, intent: Intent?) {
        if(ConnectivityManager.CONNECTIVITY_ACTION==intent?.action){

            //网络改变
            Log.i(TAG,"NETWORK_CHANGE")
            val connectivityManager =
                context?.getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
            val info = connectivityManager.activeNetworkInfo
            if (info != null && info.isConnected) {
                val type = info.type
                Log.i(TAG,"network isconnected ,type is $type")
            } else {
                Log.i(TAG,"network disconnected ,type is -1")
            }
        }
    }
}

这里要添加两个权限到AndroidManifest.xml下

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

再注册一下NetWorkReciever

<receiver android:name=".reciever.NetWorkReciever">
    <intent-filter>
        <action android:name="android.intent.action.CONNECTIVITY_CHANGE"/>
    </intent-filter>

最终运行效果

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代码地址：https://github.com/jiaoery/MyAndroidKotlin(也有一些其他的代码学习记录)

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