我的非 root Android 4.4 设备上有一个第三方 VPN 应用程序，我想编写一个后台服务来监视 VPN 连接并在 VPN 连接断开时提醒用户。
有没有办法做到这一点？我找不到任何使用 VPNService API 的方法。
谢谢-D
使用
NetworkCapabilitiesVPN_TRANSPORTConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] networks = cm.getAllNetworks();
Log.i(TAG, "Network count: " + networks.length);
for(int i = 0; i < networks.length; i++) {
NetworkCapabilities caps = cm.getNetworkCapabilities(networks[i]);
Log.i(TAG, "Network " + i + ": " + networks[i].toString());
Log.i(TAG, "VPN transport is: " + caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN));
Log.i(TAG, "NOT_VPN capability is: " + caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN));
}
检查活动网络是否使用 VPN 的替代方法：
Network activeNetwork = connectivityManager.getActiveNetwork();
NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(activeNetwork);
boolean vpnInUse = caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN);
这对我有用： 从 API 16 到 23 测试：
List<String> networkList = new ArrayList<>();
try {
for (NetworkInterface networkInterface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
if (networkInterface.isUp())
networkList.add(networkInterface.getName());
}
} catch (Exception ex) {
Timber.d("isVpnUsing Network List didn't received");
}
return networkList.contains("tun0");
附言它也可以是另一个名为“ppp0”的网络接口，但在我使用不同的 VPN 应用程序进行的测试中，它始终是“tun0”
迟到的答案，在 Android 上测试
16 <-> 29public boolean vpn() {
String iface = "";
try {
for (NetworkInterface networkInterface : Collections.list(NetworkInterface.getNetworkInterfaces())) {
if (networkInterface.isUp())
iface = networkInterface.getName();
Log.d("DEBUG", "IFACE NAME: " + iface);
if ( iface.contains("tun") || iface.contains("ppp") || iface.contains("pptp")) {
return true;
}
}
} catch (SocketException e1) {
e1.printStackTrace();
}
return false;
}
以上不适用于 wireguard 因为接口名称可以是任何东西（通常是连接的名称）。
这是
kotlin coroutines flowval isVpnActiveFlow = callbackFlow {
val connectivityManager =
context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
if (connectivityManager == null) {
channel.close(IllegalStateException("connectivity manager is null"))
return@callbackFlow
} else {
val callback = object : ConnectivityManager.NetworkCallback() {
override fun onAvailable(network: Network) {
channel.trySend(true)
}
override fun onLost(network: Network) {
channel.trySend(false)
}
}
connectivityManager.registerNetworkCallback(
//I have to investigate on this builder!
NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_VPN)
.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
.build(),
callback
)
awaitClose {
connectivityManager.unregisterNetworkCallback(callback)
}
}
}
我为自己编写了一个适用于 API 21 及更高版本的辅助函数。
public static boolean vpnActive(Context context){
// This method doesn't work below API 21
if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
return false;
boolean vpnInUse = false;
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
Network activeNetwork = connectivityManager.getActiveNetwork();
NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(activeNetwork);
return caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN);
}
Network[] networks = connectivityManager.getAllNetworks();
for (int i = 0; i < networks.length; i++) {
NetworkCapabilities caps = connectivityManager.getNetworkCapabilities(networks[i]);
if (caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN)) {
vpnInUse = true;
break;
}
}
return vpnInUse;
}
编写一个点击内部页面或 ping 内部站点的小应用程序...
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(internal_url);
HttpResponse response = client.execute(request);
String html = "";
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder str = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null)
{
str.append(line);
}
in.close();
html = str.toString();
或
String str = "";
try
{
Process process = Runtime.getRuntime().exec(
"/system/bin/ping -c 8 " + internal_url);
BufferedReader reader = new BufferedReader(new InputStreamReader(
process.getInputStream()));
int i;
char[] buffer = new char[4096];
StringBuffer output = new StringBuffer();
while ((i = reader.read(buffer)) > 0)
output.append(buffer, 0, i);
reader.close();
str = output.toString();
}
catch (IOException e)
{
e.printStackTrace();
}
return str;
检查网络信息如何？如果有一种 VPN，我会假设有 VPN 连接。
需要 ACCESS_NETWORK_STATE 权限。
List<NetworkInfo> connectedNetworks = new ArrayList<>();
if (Build.VERSION.SDK_INT >= 21)
{
Network[] networks = m_ConnectivityManager.getAllNetworks();
for (Network n : networks)
{
NetworkInfo ni = m_ConnectivityManager.getNetworkInfo(n);
if (ni.isConnectedOrConnecting())
{
connectedNetworks.add(ni);
}
}
}
else
{
NetworkInfo[] nis = m_ConnectivityManager.getAllNetworkInfo();
for (NetworkInfo ni : nis)
{
if (ni.isConnectedOrConnecting())
{
connectedNetworks.add(ni);
}
}
}
boolean bHasVPN = false;
if (Build.VERSION.SDK_INT >= 21)
{
for (NetworkInfo ni : connectedNetworks)
{
bHasVPN |= (ni.getType() == ConnectivityManager.TYPE_VPN);
}
}
这适用于 API < 21 too :
ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo[] infos=manager.getAllNetworkInfo();
boolean VPNConnected = false;
for (NetworkInfo info : infos){
if ("VPN".equalsIgnoreCase(info.getTypeName()){
if (info.getState() == NetworkInfo.State.CONNECTED){
VPNConnected = true;
break;
}
}
}