Android check internet connection

Question

I want to create an app that uses the internet and I m trying to create a function that checks if a connection is available and if it isn t  go to an activity that has a retry button and an explanation    Attached is my code so far  but I m getting the error Syntax error  insert     to complete MethodBody   Now I have been placing these in trying to get it to work  but so far no luck    Any help would be appreciated   public class TheEvoStikLeagueActivity extends Activity       private final int SPLASH DISPLAY LENGHT   3000           Called when the activity is first created          Override     public void onCreate Bundle icicle            super onCreate icicle           setContentView R layout main            private boolean checkInternetConnection                 ConnectivityManager conMgr    ConnectivityManager  getSystemService  Context CONNECTIVITY SERVICE                  ARE WE CONNECTED TO THE NET             if  conMgr getActiveNetworkInfo      null                      amp  amp  conMgr getActiveNetworkInfo   isAvailable                        amp  amp  conMgr getActiveNetworkInfo   isConnected                       return true                      New Handler to start the Menu-Activity                    and close this Splash-Screen after some seconds                    new Handler   postDelayed new Runnable                         public void run                                Create an Intent that will start the Menu-Activity                             Intent mainIntent   new Intent TheEvoStikLeagueActivity this  IntroActivity class                           TheEvoStikLeagueActivity this startActivity mainIntent                           TheEvoStikLeagueActivity this finish                                             SPLASH DISPLAY LENGHT                 else                   return false                   Intent connectionIntent   new Intent TheEvoStikLeagueActivity this  HomeActivity class                   TheEvoStikLeagueActivity this startActivity connectionIntent                   TheEvoStikLeagueActivity this finish

User · Answer

Use this code to check the internet connection  ConnectivityManager connectivityManager    ConnectivityManager  ctx                  getSystemService Context CONNECTIVITY SERVICE           if   connectivityManager                  getNetworkInfo ConnectivityManager TYPE MOBILE     null  amp  amp  connectivityManager                  getNetworkInfo ConnectivityManager TYPE MOBILE  getState      NetworkInfo State CONNECTED                      connectivityManager                          getNetworkInfo ConnectivityManager TYPE WIFI     null  amp  amp  connectivityManager                          getNetworkInfo ConnectivityManager TYPE WIFI                           getState      NetworkInfo State CONNECTED                 return true            else               return false

User · Answer

Try the following code   public static boolean isNetworkAvailable Context context            boolean outcome   false           if  context    null                ConnectivityManager cm    ConnectivityManager  context                      getSystemService Context CONNECTIVITY SERVICE                NetworkInfo   networkInfos   cm getAllNetworkInfo                 for  NetworkInfo tempNetworkInfo   networkInfos                                             Can also check if the user is in roaming                                     if  tempNetworkInfo isConnected                          outcome   true                      break                                                     return outcome

User · Answer

public boolean checkInternetConnection Context context        ConnectivityManager connectivity    ConnectivityManager  context          getSystemService Context CONNECTIVITY SERVICE       if  connectivity    null            return false        else           NetworkInfo   info   connectivity getAllNetworkInfo            if  info    null                for  int i   0  i  lt  info length  i                     if  info i  getState    NetworkInfo State CONNECTED                       return true                                                      return false

User · Answer

Check Network Available in android with internet data speed   public boolean isConnectingToInternet            ConnectivityManager connectivity    ConnectivityManager  Login Page this getSystemService Context CONNECTIVITY SERVICE             if  connectivity    null                            NetworkInfo   info   connectivity getAllNetworkInfo                  if  info    null                    for  int i   0  i  lt  info length  i                          if  info i  getState      NetworkInfo State CONNECTED                                                    try                                                               HttpURLConnection urlc    HttpURLConnection   new URL  http   www google com   openConnection                                     urlc setRequestProperty  User-Agent    Test                                    urlc setRequestProperty  Connection    close                                    urlc setConnectTimeout 500     choose your own timeframe                                 urlc setReadTimeout 500     choose your own timeframe                                 urlc connect                                    int networkcode2   urlc getResponseCode                                    return  urlc getResponseCode      200                                 catch  IOException e                                                                return  false      connectivity exists  but no internet                                                                               return false             This Function return true or false     Must get user permission        lt uses-permission android name  android permission INTERNET   gt       lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

Here is a function which I use as a part of my Utils class   public static boolean isNetworkConnected Context context        ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE       return  cm getActiveNetworkInfo      null   amp  amp  cm getActiveNetworkInfo   isConnectedOrConnecting        Use it like  Utils isNetworkConnected MainActivity this

User · Answer

You cannot create a method inside another method  move private boolean checkInternetConnection     method out of onCreate

User · Answer

No need to be complex  The simplest and framework manner is to use ACCESS NETWORK STATE permission and just make a connected method  public boolean isOnline         ConnectivityManager cm    ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE       return cm getActiveNetworkInfo      null  amp  amp  cm getActiveNetworkInfo   isConnectedOrConnecting        You can also use requestRouteToHost if you have a particualr host and connection type  wifi mobile  in mind   You will also need    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt    in your android manifest   for more detail go here

User · Answer

You can use following snippet to check Internet Connection       It will useful both way that you can check which Type of NETWORK   Connection is available so you can do your process on that way    You just have to copy following class and paste directly in your package           author Pratik Butani     public class InternetConnection                   CHECK WHETHER INTERNET CONNECTION IS AVAILABLE OR NOT             public static boolean checkConnection Context context            final ConnectivityManager connMgr    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE            if  connMgr    null                NetworkInfo activeNetworkInfo   connMgr getActiveNetworkInfo                 if  activeNetworkInfo    null       connected to the internet                    connected to the mobile provider s data plan                 if  activeNetworkInfo getType      ConnectivityManager TYPE WIFI                           connected to wifi                     return true                    else return activeNetworkInfo getType      ConnectivityManager TYPE MOBILE                                  return false            Now you can use like   if  InternetConnection checkConnection context            Its Available      else          Not Available        DON T FORGET to TAKE Permission         lt uses-permission android name  android permission INTERNET    gt   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt   lt uses-permission android name  android permission ACCESS WIFI STATE    gt    You can modify based on your requirement    Thank you

User · Answer

This method checks whether mobile is connected to internet and returns true if connected   private boolean isNetworkConnected         ConnectivityManager cm    ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE        return cm getActiveNetworkInfo      null  amp  amp  cm getActiveNetworkInfo   isConnected        in manifest    lt uses-permission android name  android permission ACCESS WIFI STATE    gt   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt    Edit  This method actually checks if device is connected to internet There is a possibility it s connected to a network but not to internet    public boolean isInternetAvailable         try           InetAddress ipAddr   InetAddress getByName  google com               You can replace it with your name             return  ipAddr equals                 catch  Exception e                return false

User · Answer

The above methods work when you are connected to a Wi-Fi source or via cell phone data packs  But in case of Wi-Fi connection there are cases when you are further asked to Sign-In like in Cafe  So in that case your application will fail as you are connected to Wi-Fi source but not with the Internet   This method works fine       public static boolean isConnected Context context            ConnectivityManager cm    ConnectivityManager context                  getSystemService Context CONNECTIVITY SERVICE        NetworkInfo activeNetwork   cm getActiveNetworkInfo        if  activeNetwork    null  amp  amp  activeNetwork isConnected              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 1000      mTimeout is in seconds             urlc connect                if  urlc getResponseCode      200                    return true                else                   return false                          catch  IOException e                Log i  warning    Error checking internet connection   e               return false                       return false       Please use this in a separate thread from the main thread as it makes a network call and will throw NetwrokOnMainThreadException if not followed   And also do not put this method inside onCreate or any other method  Put it inside a class and access it

User · Answer

1- create new java file  right click the package  new   class   name the file ConnectionDetector java  2- add the following code to the file   package  lt add you package name gt  example com example example   import android content Context  import android net ConnectivityManager   public class ConnectionDetector        private Context mContext       public ConnectionDetector Context context           this mContext   context             public boolean isConnectingToInternet             ConnectivityManager cm    ConnectivityManager mContext getSystemService Context CONNECTIVITY SERVICE           if cm getActiveNetworkInfo      null  amp  amp  cm getActiveNetworkInfo   isConnected      true                        return true                      return false             3- open your MainActivity java - the activity where you want to check connection  and do the following   A- create and define the function    ConnectionDetector mConnectionDetector  lt  pre gt    B- inside the  OnCreate  add the following   mConnectionDetector   new ConnectionDetector getApplicationContext       c- to check connection use the following steps   if  mConnectionDetector isConnectingToInternet      false      no connection- do something   else     there is connection

User · Answer

All official methods only tells whether a device is open for network or not  If your device is connected to Wifi but Wifi is not connected to internet then these method will fail  Which happen many time   No inbuilt network detection method will tell about this scenario  so created Async Callback class which will return in onConnectionSuccess and onConnectionFail  new CheckNetworkConnection this  new CheckNetworkConnection OnConnectionCallback           Override     public void onConnectionSuccess             Toast makeText context   onSuccess     toast LENGTH SHORT  show                Override     public void onConnectionFail String msg            Toast makeText context   onFail     toast LENGTH SHORT  show             execute      Network Call from async Task   public class CheckNetworkConnection extends AsyncTask  lt  Void  Void  Boolean  gt        private OnConnectionCallback onConnectionCallback      private Context context       public CheckNetworkConnection Context con  OnConnectionCallback onConnectionCallback            super            this onConnectionCallback   onConnectionCallback          this context   con              Override     protected void onPreExecute             super onPreExecute                Override     protected Boolean doInBackground Void   params            if  context    null              return false           boolean isConnected   new NetWorkInfoUtility   isNetWorkAvailableNow context           return isConnected              Override     protected void onPostExecute Boolean b            super onPostExecute b            if  b                onConnectionCallback onConnectionSuccess              else               String msg    No Internet Connection               if  context    null                  msg    Context is null               onConnectionCallback onConnectionFail msg                         public interface OnConnectionCallback           void onConnectionSuccess             void onConnectionFail String errorMsg             Actual Class which will ping to server    class NetWorkInfoUtility        public boolean isWifiEnable             return isWifiEnable             public void setIsWifiEnable boolean isWifiEnable            this isWifiEnable   isWifiEnable             public boolean isMobileNetworkAvailable             return isMobileNetworkAvailable             public void setIsMobileNetworkAvailable boolean isMobileNetworkAvailable            this isMobileNetworkAvailable   isMobileNetworkAvailable             private boolean isWifiEnable   false      private boolean isMobileNetworkAvailable   false       public boolean isNetWorkAvailableNow Context context            boolean isNetworkAvailable   false           ConnectivityManager connectivityManager    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE            setIsWifiEnable connectivityManager getNetworkInfo ConnectivityManager TYPE WIFI  isConnected             setIsMobileNetworkAvailable connectivityManager getNetworkInfo ConnectivityManager TYPE MOBILE  isConnected              if  isWifiEnable      isMobileNetworkAvailable                    Sometime wifi is connected but service provider never connected to internet             so cross check one more time               if  isOnline                    isNetworkAvailable   true                     return isNetworkAvailable             public boolean isOnline               Just to check Time delay           long t   Calendar getInstance   getTimeInMillis             Runtime runtime   Runtime getRuntime            try                 Pinging to Google server               Process ipProcess   runtime exec   system bin ping -c 1 8 8 8 8                int exitValue   ipProcess waitFor                return  exitValue    0             catch  IOException e                e printStackTrace              catch  InterruptedException e                e printStackTrace              finally               long t2   Calendar getInstance   getTimeInMillis                Log i  NetWork check Time    t2 - t                           return false

User · Answer

The accepted answer s EDIT shows how to check if something on the internet can be reached  I had to wait too long for an answer when this was not the case  with a wifi that does NOT have an internet connection   Unfortunately InetAddress getByName does not have a timeout parameter  so the next code works around that   private boolean internetConnectionAvailable int timeOut        InetAddress inetAddress   null      try           Future lt InetAddress gt  future   Executors newSingleThreadExecutor   submit new Callable lt InetAddress gt                   Override             public InetAddress call                     try                       return InetAddress getByName  google com                      catch  UnknownHostException e                        return null                                                      inetAddress   future get timeOut  TimeUnit MILLISECONDS           future cancel true         catch  InterruptedException e          catch  ExecutionException e          catch  TimeoutException e               return inetAddress  null  amp  amp   inetAddress equals

User · Answer

After  return  statement  you can t write any code excluding try-finally block   Move your new activity codes before the  return  statements

User · Answer

Check to make sure it is  quot connected quot  to a network  public boolean isNetworkAvailable Context context        ConnectivityManager connectivityManager     ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE        return connectivityManager getActiveNetworkInfo      null  amp  amp  connectivityManager getActiveNetworkInfo   isConnected       Check to make sure it is  quot connected quot  to a internet  public boolean isInternetAvailable         try           InetAddress address   InetAddress getByName  quot www google com quot            return  address equals  quot  quot          catch  UnknownHostException e               Log error           return false     Permission needed   lt uses-permission android name  quot android permission ACCESS NETWORK STATE quot    gt   https   stackoverflow com a 17583324 950427

User · Answer

This is the another option to handle all situation   public void isNetworkAvailable         ConnectivityManager connectivityManager    ConnectivityManager  ctx getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetworkInfo   connectivityManager getActiveNetworkInfo        if  activeNetworkInfo    null  amp  amp  activeNetworkInfo isConnected            else           Toast makeText ctx   Internet Connection Is Required   Toast LENGTH LONG  show

User · Answer

I had issues with the IsInternetAvailable answer not testing for cellular networks  rather only if wifi was connected  This answer works for both wifi and mobile data   How to check network connection enable or disable in WIFI and 3G data plan  in mobile

User · Answer

Use this method   public static boolean isOnline         ConnectivityManager cm    ConnectivityManager  context              getSystemService Context CONNECTIVITY SERVICE       NetworkInfo netInfo   cm getActiveNetworkInfo        return netInfo    null  amp  amp  netInfo isConnectedOrConnecting        This is the permission needed    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

in manifest   lt uses-permission android name  android permission ACCESS WIFI STATE    gt   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt    in code   public static boolean isOnline Context ctx        if  ctx    null          return false       ConnectivityManager cm                ConnectivityManager  ctx getSystemService Context CONNECTIVITY SERVICE       NetworkInfo netInfo   cm getActiveNetworkInfo        if  netInfo    null  amp  amp  netInfo isConnectedOrConnecting              return true            return false

User · Answer

You can simply ping an online website like google  public boolean isConnected   throws InterruptedException  IOException       String command    quot ping -c 1 google com quot       return Runtime getRuntime   exec command  waitFor      0

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