Detect whether there is an Internet connection available on Android

Question

Possible Duplicate  How to check internet access on Android  InetAddress never timeouts   I need to detect whether the Android device is connected to the Internet  The NetworkInfo class provides a non-static method isAvailable   that sounds perfect  Problem is that  NetworkInfo ni   new NetworkInfo    if   ni isAvailable             do something    throws this error  The constructor NetworkInfo is not visible   Safe bet is there is another class that returns a NetworkInfo object  But I don t know which   How to get the above snippet of code to work  How could I have found myself the information I needed in the online documentation  Can you suggest a better way for this type of detection

User · Answer

Probably I have found myself   ConnectivityManager connectivityManager    ConnectivityManager getSystemService Context CONNECTIVITY SERVICE   return connectivityManager getActiveNetworkInfo   isConnectedOrConnecting

User · Answer

The getActiveNetworkInfo   method of ConnectivityManager returns a NetworkInfo instance representing the first connected network interface it can find or null if none of the interfaces are connected  Checking if this method returns null should be enough to tell if an internet connection is available or not   private boolean isNetworkAvailable         ConnectivityManager connectivityManager               ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetworkInfo   connectivityManager getActiveNetworkInfo        return activeNetworkInfo    null  amp  amp  activeNetworkInfo isConnected        You will also need    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt    in your android manifest   Edit   Note that having an active network interface doesn t guarantee that a particular networked service is available  Network issues  server downtime  low signal  captive portals  content filters and the like can all prevent your app from reaching a server  For instance you can t tell for sure if your app can reach Twitter until you receive a valid response from the Twitter service

User · Answer

Also another important note  You have to set android permission ACCESS NETWORK STATE in your AndroidManifest xml for this to work        how could I have found myself the information I needed in the online documentation    You just have to read the documentation the the classes properly enough and you ll find all answers you are looking for  Check out the documentation on ConnectivityManager  The description tells you what to do

User · Answer

The getActiveNetworkInfo   method of ConnectivityManager returns a   NetworkInfo instance representing the first connected network   interface it can find or null if none if the interfaces are connected    Checking if this method returns null should be enough to tell if an   internet connection is available    private boolean isNetworkAvailable          ConnectivityManager connectivityManager    ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE        NetworkInfo activeNetworkInfo   connectivityManager getActiveNetworkInfo         return activeNetworkInfo    null       You will also need       in your   android manifest       Edit       Note that having an active network interface doesn t guarantee that a   particular networked service is available  Networks issues  server   downtime  low signal  captive portals  content filters and the like   can all prevent your app from reaching a server  For instance you   can t tell for sure if your app can reach Twitter until you receive a   valid response from the Twitter service    getActiveNetworkInfo   shouldn t never give null  I don t know what they were thinking when they came up with that  It should give you an object always

User · Answer

I check for both Wi-fi and Mobile internet as follows     private boolean haveNetworkConnection         boolean haveConnectedWifi   false      boolean haveConnectedMobile   false       ConnectivityManager cm    ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE       NetworkInfo   netInfo   cm getAllNetworkInfo        for  NetworkInfo ni   netInfo            if  ni getTypeName   equalsIgnoreCase  WIFI                if  ni isConnected                    haveConnectedWifi   true          if  ni getTypeName   equalsIgnoreCase  MOBILE                if  ni isConnected                    haveConnectedMobile   true            return haveConnectedWifi    haveConnectedMobile      Obviously  It could easily be modified to check for individual specific connection types  e g   if your app needs the potentially higher speeds of Wi-fi to work correctly etc

User · Answer

Step 1  Create a class AppStatus in your project you can give any other name also   Then please paste the given below lines into your code   import android content Context  import android net ConnectivityManager  import android net NetworkInfo  import android util Log    public class AppStatus        private static AppStatus instance   new AppStatus        static Context context      ConnectivityManager connectivityManager      NetworkInfo wifiInfo  mobileInfo      boolean connected   false       public static AppStatus getInstance Context ctx            context   ctx getApplicationContext            return instance             public boolean isOnline             try               connectivityManager    ConnectivityManager  context                          getSystemService Context CONNECTIVITY SERVICE            NetworkInfo networkInfo   connectivityManager getActiveNetworkInfo            connected   networkInfo    null  amp  amp  networkInfo isAvailable    amp  amp                  networkInfo isConnected            return connected              catch  Exception e                System out println  CheckConnectivity Exception      e getMessage                 Log v  connectivity   e toString                       return connected            Step 2  Now to check if the your device has network connectivity then just add this code snippet where ever you want to check      if  AppStatus getInstance this  isOnline           Toast makeText this  You are online      8000  show       else        Toast makeText this  You are not online      8000  show        Log v  Home                                You are not online

[android] Detect whether there is an Internet connection available on Android

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