Detect if Android device has Internet connection

Question

I need to tell if my device has Internet connection or not  I found many answers like   private boolean isNetworkAvailable         ConnectivityManager connectivityManager              ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetworkInfo   connectivityManager getActiveNetworkInfo        return activeNetworkInfo    null       Taken from Detect whether there is an Internet connection available on Android    But this is not right  for example if I m connected to a wireless network which doesn t have Internet access  this method will return true    Is there a way to tell if the device has Internet connection and not if it is only connected to something

User · Answer

Check wifi type in connectivity manager        check network connection     ConnectivityManager cm    ConnectivityManager  this getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetwork   cm getActiveNetworkInfo        boolean hasNetworkConnection   activeNetwork    null  amp  amp  activeNetwork isConnectedOrConnecting        System out println  Connection         hasNetworkConnection         check wifi     boolean hasWifiConnection   activeNetwork getType      ConnectivityManager TYPE WIFI      System out println  Wifi         hasWifiConnection     Android Documentation describes  TYPE WIFI  as  A WIFI data connection  Devices may support more than one

User · Answer

You can do this using the ConnectivityManager API for android  It allows you to check whether you are connected to the internet and the type of internet connection you are connected to  Basically  Metered or Un-metered   To check for internet connection   ConnectivityManager cm    ConnectivityManager context getSystemService Context CONNECTIVITY SERVICE   NetworkInfo activeNetwork   cm getActiveNetworkInfo    boolean isConnected   activeNetwork    null  amp  amp  activeNetwork isConnectedOrConnecting      Documentation link  https   developer android com training monitoring-device-state connectivity-status-type

User · Answer

private static NetworkUtil mInstance  private volatile boolean mIsOnline   private NetworkUtil         ScheduledExecutorService exec   Executors newSingleThreadScheduledExecutor        exec scheduleAtFixedRate new Runnable              Override         public void run                 boolean reachable   false              try                   Process process   java lang Runtime getRuntime   exec  ping -c 1 www google com                    int returnVal   process waitFor                    reachable    returnVal  0                 catch  Exception e                    e printStackTrace                              mIsOnline   reachable                   0  5  TimeUnit SECONDS      public static NetworkUtil getInstance         if  mInstance    null            synchronized  NetworkUtil class                if  mInstance    null                    mInstance   new NetworkUtil                                      return mInstance     public boolean isOnline         return mIsOnline      Hope the above code helps you  also make sure you have internet permission in ur app

User · Answer

public boolean isInternetWorking         boolean success   false      try           URL url   new URL  https   google com            HttpURLConnection connection    HttpURLConnection  url openConnection            connection setConnectTimeout 10000           connection connect            success   connection getResponseCode      200        catch  IOException e            e printStackTrace              return success      return true  if internet is actually available   Make sure you have these two permission   lt uses-permission android name  android permission INTERNET   gt   lt uses-permission android name  android permission ACCESS NETWORK STATE   gt    if http does not work its because of the new android security they donot allow plain text communication now  for now just to by pass it      android usesCleartextTraffic  true

User · Answer

You are right  The code you ve provided only checks if there is a network connection  The best way to check if there is an active Internet connection is to try and connect  to a known server via http   public static boolean hasActiveInternetConnection Context context        if  isNetworkAvailable context             try               HttpURLConnection urlc    HttpURLConnection   new URL  http   www google com   openConnection                 urlc setRequestProperty  User-Agent    Test                urlc setRequestProperty  Connection    close                urlc setConnectTimeout 1500                urlc connect                return  urlc getResponseCode      200             catch  IOException e                Log e LOG TAG   Error checking internet connection   e                   else           Log d LOG TAG   No network available               return false      Of course you can substitute the http   www google com URL for any other server you want to connect to  or a server you know has a good uptime   As Tony Cho also pointed out in this comment below  make sure you don t run this code on the main thread  otherwise you ll get a NetworkOnMainThread exception  in Android 3 0 or later   Use an AsyncTask or Runnable instead   If you want to use google com you should look at Jeshurun s modification  In his answer he modified my code and made it a bit more efficient  If you connect to   HttpURLConnection urlc    HttpURLConnection                new URL  http   clients3 google com generate 204                openConnection       and then check the responsecode for 204  return  urlc getResponseCode      204  amp  amp  urlc getContentLength      0     then you don t have to fetch the entire google home page first

User · Answer

If all above answers get you FATAL EXCEPTIONs like android os NetworkOnMainThreadException  this answer will really help you   Because I got this error while trying to implement this   The reason for this error is that the Network related codes cannot be on the main thread   So  you need to create a new Thread as I shown below   Thread thread   new Thread new Runnable       Override public void run         try              Your code goes here       catch  Exception e            e printStackTrace                 And put your code in the place I commented

User · Answer

A nice solution to check if the active network have internet connection    public boolean isNetworkAvailable Context context        ConnectivityManager connectivityManager                ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE       if  connectivityManager    null            Network network   connectivityManager getActiveNetwork            NetworkCapabilities networkCapabilities   connectivityManager getNetworkCapabilities network           return networkCapabilities    null  amp  amp  networkCapabilities                  hasCapability NetworkCapabilities NET CAPABILITY INTERNET             return false

User · Answer

If you re targeting Android 6 0 - Marshmallow  API level 23  or higher it s possible to use the new NetworkCapabilities class  i e  public static boolean hasInternetConnection final Context context        final ConnectivityManager connectivityManager    ConnectivityManager context              getSystemService Context CONNECTIVITY SERVICE        final Network network   connectivityManager getActiveNetwork        final NetworkCapabilities capabilities   connectivityManager              getNetworkCapabilities network        return capabilities    null              amp  amp  capabilities hasCapability NetworkCapabilities NET CAPABILITY VALIDATED

User · Answer

You don t necessarily need to make a full HTTP connection  You could try just opening a TCP connection to a known host and if it succeeds you have internet connectivity   public boolean hostAvailable String host  int port      try  Socket socket   new Socket          socket connect new InetSocketAddress host  port   2000       return true      catch  IOException e           Either we have a timeout or unreachable host or failed DNS lookup     System out println e       return false          Then just check with   boolean online   hostAvailable  www google com   80

User · Answer

You can use ConnectivityManager      val cm   getApplicationContext   getSystemService Context CONNECTIVITY SERVICE  as ConnectivityManager             val activeNetwork  NetworkInfo    cm activeNetworkInfo             val dialogBuilder   AlertDialog Builder this               if  activeNetwork  null     Some network is available                               if  activeNetwork isConnected       Network is connected to internet       else     Network is NOT connected to internet          Check this and this

User · Answer

The latest way to do that from the documentation is to use the ConnectivityManager to query the active network and determine if it has Internet connectivity   public boolean hasInternetConnectivity         ConnectivityManager cm            ConnectivityManager context getSystemService Context CONNECTIVITY SERVICE        NetworkInfo activeNetwork   cm getActiveNetworkInfo        return  activeNetwork    null  amp  amp                        activeNetwork isConnectedOrConnecting         Add these two permissions to your AndroidManifest xml file    lt uses-permission android name  android permission INTERNET   gt   lt uses-permission android name  android permission ACCESS NETWORK STATE   gt

User · Answer

I have modified THelper s answer slightly  to use a known hack that Android already uses to check if the connected WiFi network has Internet access  This is a lot more efficient over grabbing the entire Google home page  See here and here for more info   public static boolean hasInternetAccess Context context        if  isNetworkAvailable context             try               HttpURLConnection urlc    HttpURLConnection                    new URL  http   clients3 google com generate 204                    openConnection                 urlc setRequestProperty  User-Agent    Android                urlc setRequestProperty  Connection    close                urlc setConnectTimeout 1500                urlc connect                return  urlc getResponseCode      204  amp  amp                          urlc getContentLength      0             catch  IOException e                Log e TAG   Error checking internet connection   e                   else           Log d TAG   No network available               return false

User · Answer

You can do this with very simple class  class CheckInternet       fun isNetworkAvailable context  Context   Boolean           val connectivityManager               context getSystemService Context CONNECTIVITY SERVICE  as ConnectivityManager          val activeNetworkInfo   connectivityManager   activeNetworkInfo         return activeNetworkInfo    null  amp  amp  activeNetworkInfo isConnected          Now you can check this from any class  if  CheckInternet   isNetworkAvailable this         connected with internet  else      Not connected with internet

User · Answer

Use the following class  updated to the last API level  29      License  MIT    http   opensource org licenses MIT package net i2p android router util   import android content Context  import android net ConnectivityManager  import android net Network  import android net NetworkCapabilities  import android net NetworkInfo  import android os AsyncTask  import android os Build  import android telephony TelephonyManager   import java io IOException  import java net InetSocketAddress  import java net Socket  import java net UnknownHostException  import java util ArrayList  import java util concurrent CancellationException            Check device s network connectivity and speed         author emil http   stackoverflow com users 220710 emil     author str4d     author rodrigo https   stackoverflow com users 5520417 rodrigo     public class ConnectivityAndInternetAccessCheck        private static ArrayList  lt  String  gt  hosts   new ArrayList  lt  String  gt                             add  google com                add  facebook com                add  apple com                add  amazon com                add  twitter com                add  linkedin com                add  microsoft com                                    Get the network info                 param context the Context          return the active NetworkInfo              private static NetworkInfo getNetworkInfo Context context            NetworkInfo networkInfo   null          ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           if  cm    null                networkInfo   cm getActiveNetworkInfo                      return networkInfo                        Gets the info of all networks         param context The context         return an array of  code   link NetworkInfo               private static NetworkInfo   getAllNetworkInfo Context context            ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           return cm getAllNetworkInfo                          Gives the connectivity manager         param context The context         return the  code   link ConnectivityManager               private static ConnectivityManager getConnectivityManager Context context            return  ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE                         Check if there is any connectivity at all                 param context the Context          return true if we are connected to a network  false otherwise              public static boolean isConnected Context context            boolean isConnected   false          if  Build VERSION SDK INT  gt   Build VERSION CODES M                ConnectivityManager connectivityManager   ConnectivityAndInternetAccessCheck getConnectivityManager context               Network   networks   connectivityManager getAllNetworks                networksloop  for  Network network  networks                    if  network    null                        isConnected   false                    else                       NetworkCapabilities networkCapabilities   connectivityManager getNetworkCapabilities network                       if networkCapabilities hasCapability NetworkCapabilities NET CAPABILITY INTERNET                            isConnected   true                          break networksloop                                            else                           isConnected   false                                                                   else               NetworkInfo   networkInfos   ConnectivityAndInternetAccessCheck getAllNetworkInfo context               networkinfosloop  for  NetworkInfo info  networkInfos                       Works on emulator and devices                     Note the use of isAvailable   - without this  isConnected   can                    return true when Wifi is disabled                     http   stackoverflow com a 2937915                 isConnected   info    null  amp  amp  info isAvailable    amp  amp  info isConnected                    if  isConnected                        break networkinfosloop                                                     return isConnected                        Check if there is any connectivity to a Wifi network                 param context the Context          return true if we are connected to a Wifi network  false otherwise              public static boolean isConnectedWifi Context context            boolean isConnectedWifi   false          if  Build VERSION SDK INT  gt   Build VERSION CODES M                ConnectivityManager connectivityManager   ConnectivityAndInternetAccessCheck getConnectivityManager context               Network   networks   connectivityManager getAllNetworks                networksloop  for  Network network  networks                    if  network    null                        isConnectedWifi   false                    else                       NetworkCapabilities networkCapabilities   connectivityManager getNetworkCapabilities network                       if networkCapabilities hasCapability NetworkCapabilities NET CAPABILITY INTERNET                            if  networkCapabilities hasTransport NetworkCapabilities TRANSPORT WIFI                                 isConnectedWifi   true                              break networksloop                            else                               isConnectedWifi   false                                                                                               else               NetworkInfo   networkInfos   ConnectivityAndInternetAccessCheck getAllNetworkInfo context               networkinfosloop  for  NetworkInfo n  networkInfos                    isConnectedWifi   n    null  amp  amp  n isAvailable    amp  amp  n isConnected    amp  amp  n getType      ConnectivityManager TYPE WIFI                  if  isConnectedWifi                        break networkinfosloop                                                     return isConnectedWifi                        Check if there is any connectivity to a mobile network                 param context the Context          return true if we are connected to a mobile network  false otherwise              public static boolean isConnectedMobile Context context            boolean isConnectedMobile   false          if  Build VERSION SDK INT  gt   Build VERSION CODES M                ConnectivityManager connectivityManager   ConnectivityAndInternetAccessCheck getConnectivityManager context               Network   allNetworks   connectivityManager getAllNetworks                networksloop  for  Network network  allNetworks                    if  network    null                        isConnectedMobile   false                    else                       NetworkCapabilities networkCapabilities   connectivityManager getNetworkCapabilities network                       if networkCapabilities hasCapability NetworkCapabilities NET CAPABILITY INTERNET                            if  networkCapabilities hasTransport NetworkCapabilities TRANSPORT CELLULAR                                 isConnectedMobile   true                              break networksloop                            else                               isConnectedMobile   false                                                                                              else               NetworkInfo   networkInfos   ConnectivityAndInternetAccessCheck getAllNetworkInfo context               networkinfosloop  for  NetworkInfo networkInfo  networkInfos                    isConnectedMobile   networkInfo    null  amp  amp  networkInfo isAvailable    amp  amp  networkInfo isConnected    amp  amp  networkInfo getType      ConnectivityManager TYPE MOBILE                  if  isConnectedMobile                        break networkinfosloop                                                    return isConnectedMobile                        Check if there is fast connectivity                 param context the Context          return true if we have  fast  connectivity  false otherwise              public static boolean isConnectedFast Context context            boolean isConnectedFast   false          if  Build VERSION SDK INT  lt  Build VERSION CODES M                NetworkInfo   networkInfos   ConnectivityAndInternetAccessCheck getAllNetworkInfo context               networkInfosloop              for  NetworkInfo networkInfo  networkInfos                    isConnectedFast   networkInfo    null  amp  amp  networkInfo isAvailable    amp  amp  networkInfo isConnected    amp  amp  isConnectionFast networkInfo getType    networkInfo getSubtype                     if  isConnectedFast                        break networkInfosloop                                            else               throw new UnsupportedOperationException                      return isConnectedFast                        Check if the connection is fast                 param type the network type          param subType the network subtype          return true if the provided type subtype combination is classified as fast              private static boolean isConnectionFast int type  int subType            if  type    ConnectivityManager TYPE WIFI                return true            else if  type    ConnectivityManager TYPE MOBILE                switch  subType                    case TelephonyManager NETWORK TYPE 1xRTT                      return false       50-100 kbps                 case TelephonyManager NETWORK TYPE CDMA                      return false       14-64 kbps                 case TelephonyManager NETWORK TYPE EDGE                      return false       50-100 kbps                 case TelephonyManager NETWORK TYPE EVDO 0                      return true       400-1000 kbps                 case TelephonyManager NETWORK TYPE EVDO A                      return true       600-1400 kbps                 case TelephonyManager NETWORK TYPE GPRS                      return false       100 kbps                 case TelephonyManager NETWORK TYPE HSDPA                      return true       2-14 Mbps                 case TelephonyManager NETWORK TYPE HSPA                      return true       700-1700 kbps                 case TelephonyManager NETWORK TYPE HSUPA                      return true       1-23 Mbps                 case TelephonyManager NETWORK TYPE UMTS                      return true       400-7000 kbps                                       Above API level 7  make sure to set android targetSdkVersion                    to appropriate level to use these                                     case TelephonyManager NETWORK TYPE EHRPD     API level 11                     return true       1-2 Mbps                 case TelephonyManager NETWORK TYPE EVDO B     API level 9                     return true       5 Mbps                 case TelephonyManager NETWORK TYPE HSPAP     API level 13                     return true       10-20 Mbps                 case TelephonyManager NETWORK TYPE IDEN     API level 8                     return false      25 kbps                 case TelephonyManager NETWORK TYPE LTE     API level 11                     return true       10  Mbps                    Unknown                 case TelephonyManager NETWORK TYPE UNKNOWN                  default                      return false                          else               return false                       public ArrayList  lt  String  gt  getHosts             return hosts             public void setHosts ArrayList  lt  String  gt  hosts            this hosts   hosts              TODO Debug on devices                Checks that Internet is available by pinging DNS servers              private static class InternetConnectionCheckAsync extends AsyncTask  lt  Void  Void  Boolean  gt             private Context context                          Creates an instance of this class             param context The context                     public InternetConnectionCheckAsync Context context                this setContext context                                     Cancels the activity if the device is not connected to a network                       Override         protected void onPreExecute                 if   ConnectivityAndInternetAccessCheck isConnected getContext                       cancel true                                                   Tells whether there is Internet access             param voids The list of arguments             return True if Internet can be accessed                      Override         protected Boolean doInBackground Void   voids                return isConnectedToInternet getContext                         Override         protected void onPostExecute Boolean aBoolean                super onPostExecute aBoolean                                     The context                     public Context getContext                 return context                     public void setContext Context context                this context   context                    network calls shouldn t be called from main thread otherwise it will throw   NetworkOnMainThreadException                 Tells whether Internet is reachable         return true if Internet is reachable  false otherwise         param context The context             public static boolean isInternetReachable Context context            try               return new InternetConnectionCheckAsync context  execute   get              catch  CancellationException e                e printStackTrace              catch  Exception e                e printStackTrace                      return false                        Tells whether there is Internet connection         param context The context         return  code  true  if there is Internet connection             private static boolean isConnectedToInternet Context context            boolean isAvailable   false          if   ConnectivityAndInternetAccessCheck isConnected context                 isAvailable   false            else               try                   foreachloop  for  String h  new ConnectivityAndInternetAccessCheck   getHosts                          if  isHostAvailable h                             isAvailable   true                          break foreachloop                                                                    catch  IOException e                    e printStackTrace                                     return isAvailable                         Checks if the host is available         param hostName         return         throws IOException             private static boolean isHostAvailable String hostName  throws IOException           try  Socket socket   new Socket                  int port   80              InetSocketAddress socketAddress   new InetSocketAddress hostName  port               socket connect socketAddress  3000                return true            catch  UnknownHostException unknownHost                return false

User · Answer

try this one  public class ConnectionDetector       private Context  context       public ConnectionDetector Context context            this  context   context             public boolean isConnectingToInternet             if  networkConnectivity                  try                   HttpURLConnection urlc    HttpURLConnection   new URL                           http   www google com   openConnection                     urlc setRequestProperty  User-Agent    Test                    urlc setRequestProperty  Connection    close                    urlc setConnectTimeout 3000                   urlc setReadTimeout 4000                   urlc connect                       networkcode2   urlc getResponseCode                    return  urlc getResponseCode      200                 catch  IOException e                    return  false                           else             return false              private boolean networkConnectivity             ConnectivityManager cm    ConnectivityManager   context                  getSystemService Context CONNECTIVITY SERVICE           NetworkInfo networkInfo   cm getActiveNetworkInfo            if  networkInfo    null  amp  amp  networkInfo isConnected                  return true                    return false               you ll have to add the following permission to your manifest file     lt uses-permission android name  android permission ACCESS NETWORK STATE    gt   lt uses-permission android name  android permission INTERNET    gt       Then call like that    if  new ConnectionDetector MyService this   isConnectingToInternet         Log d  internet status   Internet Access     else      Log d  internet status   no Internet Access

User · Answer

Based on the accepted answers  I have built this class with a listener so you can use it in the main thread   First  InterntCheck class which checks for internet connection in the background then call a listener method with the result   public class InternetCheck extends AsyncTask lt Void  Void  Void gt          private Activity activity      private InternetCheckListener listener       public InternetCheck Activity x            activity  x               Override     protected Void doInBackground Void    params              boolean b   hasInternetAccess            listener onComplete b            return null              public void isInternetConnectionAvailable InternetCheckListener x           listener x          execute               private boolean isNetworkAvailable             ConnectivityManager connectivityManager    ConnectivityManager  activity getSystemService CONNECTIVITY SERVICE           NetworkInfo activeNetworkInfo   connectivityManager getActiveNetworkInfo            return activeNetworkInfo    null            private boolean hasInternetAccess             if  isNetworkAvailable                  try                   HttpURLConnection urlc    HttpURLConnection   new URL  http   clients3 google com generate 204   openConnection                     urlc setRequestProperty  User-Agent    Android                    urlc setRequestProperty  Connection    close                    urlc setConnectTimeout 1500                   urlc connect                    return  urlc getResponseCode      204  amp  amp                          urlc getContentLength      0                 catch  IOException e                    e printStackTrace                            else               Log d  TAG    No network available                       return false             public interface InternetCheckListener          void onComplete boolean connected              Second  instantiate an instance of the class in the main thread and wait for the response  if you have worked with Firebase api for android before this should be familiar to you     new InternetCheck activity  isInternetConnectionAvailable new InternetCheck InternetCheckListener               Override         public void onComplete boolean connected                 proceed                      Now inside onComplete method you will get whether the device is connected to the internet or not

[android] Detect if Android device has Internet connection

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