如何检查Android上的互联网接入?InetAddress从不超时

我得到了一个AsyncTask，应该检查对主机名的网络访问。但是doInBackground()永远不会超时。有人知道吗?

public class HostAvailabilityTask extends AsyncTask<String, Void, Boolean> {

    private Main main;

    public HostAvailabilityTask(Main main) {
        this.main = main;
    }

    protected Boolean doInBackground(String... params) {
        Main.Log("doInBackground() isHostAvailable():"+params[0]);

        try {
            return InetAddress.getByName(params[0]).isReachable(30); 
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;       
    }

    protected void onPostExecute(Boolean... result) {
        Main.Log("onPostExecute()");

        if(result[0] == false) {
            main.setContentView(R.layout.splash);
            return;
        }

        main.continueAfterHostCheck();
    }   
}

当前回答

这段代码将帮助您找到互联网是否打开。

public final boolean isInternetOn() {
        ConnectivityManager conMgr = (ConnectivityManager) this.con
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = conMgr.getActiveNetworkInfo();
        return (info != null && info.isConnected());
}

此外，您应该提供以下权限

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

2016-03-08 05:02:28

其他回答

你也可以用下面的代码上网查看:

 public class CheckInternetConnection {
        public Context context = null;

        public CheckInternetConnection(Context ctx) {
            this.context = ctx;
        }

        public boolean CheckInternet() {
            return isOnline();
        }
        public Boolean isOnline() 
        {
            try {
                if(isNetAvailable(context))
                    return true;
                else
                {
                    try {
                        URL url = new URL("http://www.google.com");
                        HttpURLConnection urlc = (HttpURLConnection) url
                                .openConnection();
                        urlc.setRequestProperty("User-Agent", "Test");
                        urlc.setRequestProperty("Connection", "close");
                        urlc.setConnectTimeout(3000); // This is time limit if the
                        // connection time limit
                        try {
                            urlc.connect();
                            Log.e("TAG", " urlc ----------" + urlc.getResponseCode());
                            if (urlc.getResponseCode() == 200) {
                                return true;
                            }
                        }catch (Exception e){
                            e.printStackTrace();
                        }
                    } catch (MalformedURLException e1) {
                        e1.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }catch (Exception e){
                e.printStackTrace();
            }

            return false;        
        }

         public synchronized static boolean isNetAvailable(Context context){

             try{
             boolean isNetAvailable=false;
             if ( context != null )
             {
                 ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
                 if ( mgr != null )
                 {
                     boolean mobileNetwork = false;
                     boolean wifiNetwork = false;
                     boolean wiMaxNetwork = false;

                     boolean mobileNetworkConnecetd = false;
                     boolean wifiNetworkConnecetd = false;
                     boolean wiMaxNetworkConnected = false;

                     NetworkInfo mobileInfo = mgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
                     NetworkInfo wifiInfo = mgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
                     NetworkInfo wiMaxInfo = mgr.getNetworkInfo(ConnectivityManager.TYPE_WIMAX);

                     if ( mobileInfo != null )
                         mobileNetwork = mobileInfo.isAvailable();                   

                     if ( wifiInfo != null )
                         wifiNetwork = wifiInfo.isAvailable();

                     if(wiMaxInfo != null)
                         wiMaxNetwork = wiMaxInfo.isAvailable();

                     if(wifiNetwork == true)
                         wifiNetworkConnecetd = wifiInfo.isConnectedOrConnecting();
                     if(mobileNetwork == true)
                         mobileNetworkConnecetd = mobileInfo.isConnectedOrConnecting();
                     if(wiMaxNetwork == true)
                         wiMaxNetworkConnected = wiMaxInfo.isConnectedOrConnecting();

                     isNetAvailable = ( mobileNetworkConnecetd || wifiNetworkConnecetd || wiMaxNetworkConnected );
                 }
             }
             return isNetAvailable;
             }catch(NullPointerException e)
             {
                 return false;
             }catch(Exception e)
             {
                 return false;
             }
         }


    }

2016-08-17 14:00:17

使用这个Kotlin扩展:

/**
 * Check whether network is available
 *
 * @param context
 * @return Whether device is connected to Network.
 */
fun Context.isNetworkAvailable(): Boolean {
    with(getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            //Device is running on Marshmallow or later Android OS.
            with(getNetworkCapabilities(activeNetwork)) {
                return hasTransport(NetworkCapabilities.TRANSPORT_WIFI) || hasTransport(
                    NetworkCapabilities.TRANSPORT_CELLULAR
                )
            }
        } else {
            activeNetworkInfo?.let {
                // connected to the internet
                @Suppress("DEPRECATION")
                return listOf(ConnectivityManager.TYPE_WIFI, ConnectivityManager.TYPE_MOBILE).contains(it.type)
            }
        }
    }
    return false
}

2019-12-25 14:14:42

如果您正在使用API 23或更高版本，您现在可以使用NetworkCapabilities检查internet是否处于活动状态。net_capacity_validated，由谷歌自己的ping服务支持。

ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
    @Override
    public void onLost(Network network) {
        // handle network lost
    }

    @Override
    public void onAvailable(Network network) {
        ConnectivityManager cm = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = cm.getNetworkInfo(network);
        boolean isConnected = (info != null && info.isConnectedOrConnecting());

        if (isConnected) {
            NetworkCapabilities nc = cm.getNetworkCapabilities(network);
            if (nc != null) {
                boolean isInternetValid = nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED);
                if (isInternetValid) {
                    // internet is valid
                }
            }
        }
    }
};

NetworkRequest request = new NetworkRequest.Builder().addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET).build();
ConnectivityManager connectivityManager = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
connectivityManager.registerNetworkCallback(request, networkCallback);

2017-04-15 00:09:30

最简单的解决办法是

在大多数情况下，如果他/她想连接到远程服务器，只会检查互联网连接，所以简单和最好的解决方案是ping你的服务器，如下所示。

public boolean isConnected() {
    final String command = "ping -c 1 yourExmapleDomain.com";
    boolean isConnected = false;
    try {
        isConnected = Runtime.getRuntime().exec(command).waitFor() == 0;
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return isConnected;
}

2019-03-29 17:54:29

在芬兰湾的科特林:

class UtilityMethods {
companion object {
    fun isConnected(activity: Activity): Boolean {
        val connectivityManager: ConnectivityManager =
                activity.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        return null != connectivityManager.activeNetworkInfo
    }
}}

在Activity类中调用isConnected如下:

UtilityMethods.isConnected(this)

内部片段类如下:

UtilityMethods.isConnected(activity)

2018-05-25 05:33:39

如何检查Android上的互联网接入?InetAddress从不超时

推荐文章

最新文章

标签