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

private fun hasNetwork(): Boolean {
    val connectivity = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
    val networkInfo = connectivity.activeNetworkInfo
    return networkInfo != null && networkInfo.isAvailable // networkInfo如果是null也是沒有網(wǎng)絡(luò)
}

private fun hasNetwork2(): Boolean {
    var connectivityManager: ConnectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        val network = connectivityManager.activeNetwork
        return network != null // 如果是null代表沒有網(wǎng)絡(luò)
    }
    return false
}

val cm = applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
val networks = cm.allNetworks
for (item in networks){
    val caps = cm.getNetworkCapabilities(item)
    if (caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)){
        Log.e("ytzn", "item wifi 網(wǎng)絡(luò)")

    } else if (caps.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)){
        Log.e("ytzn", "item wifi 移動網(wǎng)絡(luò)")
    }
}

private void networkListener() {
    ConnectivityManager connectivity = (ConnectivityManager) getContext().getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkRequest.Builder builder = new NetworkRequest.Builder();
    NetworkRequest request = builder.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)    // 表示此網(wǎng)絡(luò)使用Wi-Fi傳輸
            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)// 表示此網(wǎng)絡(luò)使用蜂窩傳輸
            .build();
    connectivity.registerNetworkCallback(request, new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(Network network) {
            super.onAvailable(network);
            // 網(wǎng)絡(luò)可用
            ToastUtils.showShortToast("網(wǎng)絡(luò)可用");
            Log.e("調(diào)試_臨時_log", "this_onAvailable");
        }
        @Override
        public void onUnavailable() {
            super.onUnavailable();
            // 如果在指定的超時時間內(nèi)未找到網(wǎng)絡(luò)，則調(diào)用
            Log.e("調(diào)試_臨時_log", "this_onUnavailable");
        }
        @Override
        public void onLost(@NonNull Network network) {
            super.onLost(network);
            // 當(dāng)框架的網(wǎng)絡(luò)嚴重中斷或正常故障結(jié)束時調(diào)用
            Log.e("調(diào)試_臨時_log", "this_onLost");
        }
        @Override
        public void onBlockedStatusChanged(@NonNull Network network, boolean blocked) {
            super.onBlockedStatusChanged(network, blocked);
            // 當(dāng)對指定網(wǎng)絡(luò)的訪問被阻止或取消阻止時調(diào)用
            Log.e("調(diào)試_臨時_log", "this_onBlockedStatusChanged");
        }
        @Override
        public void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities networkCapabilities) {
            super.onCapabilitiesChanged(network, networkCapabilities);
            // 當(dāng)網(wǎng)絡(luò)連接到此請求的框架*更改功能但仍滿足規(guī)定的需求時調(diào)用。
            boolean isInternet = networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);// 獲取是否能連接Internet網(wǎng)
            Log.e("調(diào)試_臨時_log", "this_onCapabilitiesChanged : isInternet = " + isInternet);
        }
        @Override
        public void onLosing(@NonNull Network network, int maxMsToLive) {
            super.onLosing(network, maxMsToLive);
            // 當(dāng)網(wǎng)絡(luò)即將斷開時調(diào)用。通常與新替換網(wǎng)絡(luò)的呼叫配對，
            // 以實現(xiàn)優(yōu)雅的切換。如果我們有嚴重損失*（損失而沒有警告），則可能無法調(diào)用此方法。
            Log.e("調(diào)試_臨時_log", "this_onLosing");
        }
        @Override
        public void onLinkPropertiesChanged(@NonNull Network network, @NonNull LinkProperties linkProperties) {
            super.onLinkPropertiesChanged(network, linkProperties);
            // 當(dāng)與該請求連接的框架網(wǎng)絡(luò)更改時調(diào)用。
            Log.e("調(diào)試_臨時_log", "this_onLinkPropertiesChanged");
        }
    });
}

    /**
    * 表示此網(wǎng)絡(luò)使用移動蜂窩傳輸。
    */
    public static final int TRANSPORT_CELLULAR = 0;
    /**
    *表示此網(wǎng)絡(luò)使用Wi-Fi傳輸。
    */
    public static final int TRANSPORT_WIFI = 1;
    /**
    * 表示此網(wǎng)絡(luò)使用藍牙傳輸
    */
    public static final int TRANSPORT_BLUETOOTH = 2;
    /**
    * 表示此網(wǎng)絡(luò)使用以太網(wǎng)傳輸。
    */
    public static final int TRANSPORT_ETHERNET = 3;
    /**
    * 指示此網(wǎng)絡(luò)使用VPN傳輸。
    */
    public static final int TRANSPORT_VPN = 4;
    /**
    * 表示此網(wǎng)絡(luò)使用支持 Wi-Fi Aware 的傳輸。
    */
    public static final int TRANSPORT_WIFI_AWARE = 5;
    /**
    * 表示此網(wǎng)絡(luò)使用低功耗傳輸。
    */
    public static final int TRANSPORT_LOWPAN = 6;