How to check currently internet connection is available or not in android

Question

I want to execute my application offline also  so I need to check if currently an internet connection is available or not  Can anybody tell me how to check if internet is available or not in android  Give sample code  I tried with the code below and checked using an emulator but it s not working  public  boolean isInternetConnection            ConnectivityManager connectivityManager     ConnectivityManager context getSystemService Context CONNECTIVITY SERVICE       return connectivityManager getActiveNetworkInfo   isConnectedOrConnecting          Thanks

User · Answer

public boolean isNetworkAvailable Context context        ConnectivityManager connectivityManager    ConnectivityManager  context              getSystemService context CONNECTIVITY SERVICE       NetworkInfo activeNetworkInfo   connectivityManager              getActiveNetworkInfo        return activeNetworkInfo    null  amp  amp  activeNetworkInfo isConnected

User · Answer

You can use two method    1 - for check connection       private boolean isNetworkConnected             ConnectivityManager cm    ConnectivityManager  getContext   getSystemService Context CONNECTIVITY SERVICE           return cm getActiveNetworkInfo      null          2 - for check internet      public boolean internetIsConnected             try               String command    ping -c 1 google com               return  Runtime getRuntime   exec command  waitFor      0             catch  Exception e                return false                    Add permissions to manifest        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

User · Answer

You can just try to establish a TCP connection to a remote host   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   boolean online   hostAvailable  www google com   80

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This will show an dialog error box if there is not network connectivity      ConnectivityManager connMgr    ConnectivityManager getSystemService Context CONNECTIVITY SERVICE       NetworkInfo networkInfo   connMgr getActiveNetworkInfo         if  networkInfo    null  amp  amp  networkInfo isConnected                 fetch data       else           new AlertDialog Builder this               setTitle  Connection Failure                setMessage  Please Connect to the Internet                setPositiveButton android R string ok  new DialogInterface OnClickListener                     public void onClick DialogInterface dialog  int which                                                  setIcon android R drawable ic dialog alert               show

User · Answer

This code to check the network availability for all versions of Android including Android 9 0 and above  public static boolean isNetworkConnected Context  context        ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetworkInfo   cm getActiveNetworkInfo           For 29 api or above     if  Build VERSION SDK INT  gt   Build VERSION CODES Q            NetworkCapabilities capabilities   cm getNetworkCapabilities cm getActiveNetwork             return capabilities hasTransport NetworkCapabilities TRANSPORT WIFI                     capabilities hasTransport NetworkCapabilities TRANSPORT ETHERNET                     capabilities hasTransport NetworkCapabilities TRANSPORT CELLULAR         else return activeNetworkInfo    null  amp  amp  activeNetworkInfo isConnected       Don t forget to add network-state permission in your manifest  lt uses-permission android name  quot android permission ACCESS NETWORK STATE quot    gt   Also  add  SuppressWarnings   quot deprecation quot    before the method to avoid android studio deprecation warning

User · Answer

This function works fine      public void checkConnection                 ConnectivityManager connectivityManager  ConnectivityManager                   this getSystemService Context CONNECTIVITY SERVICE       NetworkInfo wifi connectivityManager getNetworkInfo ConnectivityManager TYPE WIFI      NetworkInfo  network connectivityManager getNetworkInfo ConnectivityManager TYPE MOBILE             if  wifi isConnected                           Internet available                    else if network isConnected                             Internet available                     else                          Internet is not available                   Add the permission to AndroidManifest xml   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

if you want to check the internet connection and it changes such wifi disconnection or mobile data you can use this library   internet connection library

User · Answer

Also  be aware that sometimes the user will be connected to a Wi-Fi network  but that network might require browser-based authentication  Most airport and hotel hotspots are like that  so you application might be fooled into thinking you have connectivity  and then any URL fetches will actually retrieve the hotspot s login page instead of the page you are looking for   Depending on the importance of performing this check  in addition to checking the connection with ConnectivityManager  I d  suggest including code to check that it s a working Internet connection and not just an illusion  You can do that by trying to fetch a known address resource from your site  like a 1x1 PNG image or 1-byte text file

User · Answer

package com base64   import android content Context  import android graphics Bitmap  import android graphics BitmapFactory  import android net ConnectivityManager  import android net NetworkInfo  import android support v7 app AppCompatActivity  import android os Bundle  import android util Base64  import android widget ImageView  import android widget Toast   import com androidquery AQuery   public class MainActivity extends AppCompatActivity        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            if isConnectingToInternet MainActivity this                         Toast makeText getApplicationContext    internet is available  Toast LENGTH LONG  show                      else               System out print  internet is not available                         public static boolean isConnectingToInternet Context context                ConnectivityManager connectivity                    ConnectivityManager  context 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                                                return true                                          return false               manifest      lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android      package  com base64  gt        lt uses-permission android name  android permission INTERNET   gt       lt uses-permission android name  android permission ACCESS NETWORK STATE   gt        lt application         android allowBackup  true          android icon   mipmap ic launcher          android label   string app name          android supportsRtl  true          android theme   style AppTheme  gt           lt activity android name   MainActivity  gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                    lt category android name  android intent category LAUNCHER    gt               lt  intent-filter gt           lt  activity gt       lt  application gt    lt  manifest gt

User · Answer

Use the method checkConnectivity     if  checkConnectivity           do something           Method to check your connectivity   private boolean checkConnectivity             boolean enabled   true           ConnectivityManager connectivityManager    ConnectivityManager  this getSystemService Context CONNECTIVITY SERVICE           NetworkInfo info   connectivityManager getActiveNetworkInfo             if   info    null     info isConnected       info isAvailable                                   Toast makeText getApplicationContext     Sin conexi  n a Internet      Toast LENGTH SHORT  show                return false            else               return true                     return false

User · Answer

Use Below Code   private boolean isNetworkAvailable       ConnectivityManager connectivityManager           ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE     NetworkInfo activeNetworkInfo   connectivityManager getActiveNetworkInfo      return activeNetworkInfo    null  amp  amp  activeNetworkInfo isConnected        if isNetworkAvailable   returns true then internet connection available  otherwise internet connection not available  Here need to add below uses-permission in your application Manifest file   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

public  boolean isInternetConnection                 ConnectivityManager connectivityManager    ConnectivityManager getSystemService Context CONNECTIVITY SERVICE           if connectivityManager getNetworkInfo ConnectivityManager TYPE MOBILE  getState      NetworkInfo State CONNECTED                    connectivityManager getNetworkInfo ConnectivityManager TYPE WIFI  getState      NetworkInfo State CONNECTED                  we are connected to a network             return  true                    else               return false

User · Answer

Deprecated on API 29  getActiveNetworkInfo is deprecated from in API 29  So we can use it in  bellow 29  New code in Kotlin for All the API fun isNetworkAvailable context  Context   Boolean       val connectivityManager   context getSystemService Context CONNECTIVITY SERVICE  as ConnectivityManager            For 29 api or above     if  Build VERSION SDK INT  gt   Build VERSION CODES Q            val capabilities   connectivityManager getNetworkCapabilities connectivityManager activeNetwork     return false         return when               capabilities hasTransport NetworkCapabilities TRANSPORT WIFI  - gt     true             capabilities hasTransport NetworkCapabilities TRANSPORT ETHERNET  - gt    true             capabilities hasTransport NetworkCapabilities TRANSPORT CELLULAR  - gt    true             else - gt      false                         For below 29 api     else           if  connectivityManager activeNetworkInfo    null  amp  amp  connectivityManager activeNetworkInfo   isConnectedOrConnecting                return true                     return false

User · Answer

You can try this  private boolean isConnectedToWifi        ConnectivityManager cm    ConnectivityManager  getApplication   getSystemService Context CONNECTIVITY SERVICE       if cm    null               NetworkCapabilities nc   cm getNetworkCapabilities cm getActiveNetwork             return nc hasTransport NetworkCapabilities TRANSPORT WIFI             return false

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public static   boolean isInternetConnection Context mContext        ConnectivityManager connectivityManager    ConnectivityManager mContext getSystemService Context CONNECTIVITY SERVICE       if connectivityManager getNetworkInfo ConnectivityManager TYPE MOBILE  getState      NetworkInfo State CONNECTED                connectivityManager getNetworkInfo ConnectivityManager TYPE WIFI  getState      NetworkInfo State CONNECTED              we are connected to a network         return  true            else           return false

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use the next code   public static boolean isNetworkAvaliable Context ctx        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            remember that yo need put in your manifest the next line    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

try using ConnectivityManager   ConnectivityManager connectivity    ConnectivityManager  context 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                        return true                                                   return false   Also Add permission to AndroidManifest xml   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

public boolean isOnline         ConnectivityManager cm    ConnectivityManager  getSystemService Context CONNECTIVITY SERVICE       NetworkInfo netInfo   cm getActiveNetworkInfo        if  netInfo    null  amp  amp  netInfo isConnectedOrConnecting              return true        else           return false            Google recommends this code block for checking internet connection  Because the device may have not internet connection even if it is connected to WiFi

User · Answer

This will tell if you re connected to a network   boolean connected   false  ConnectivityManager connectivityManager    ConnectivityManager getSystemService Context CONNECTIVITY SERVICE       if connectivityManager getNetworkInfo ConnectivityManager TYPE MOBILE  getState      NetworkInfo State CONNECTED                 connectivityManager getNetworkInfo ConnectivityManager TYPE WIFI  getState      NetworkInfo State CONNECTED              we are connected to a network         connected   true            else         connected   false    Warning  If you are connected to a WiFi network that doesn t include internet access or requires browser-based authentication  connected will still be true   You will need this permission in your manifest    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt

User · Answer

Use ConnectivityManager Service  Source Link           import android net ConnectivityManager            public class Utils       static ConnectivityManager connectivityManager                       public static String isOnline Context context            JSONArray array   new JSONArray            JSONObject jsonObject   new JSONObject            try               jsonObject put  connected   false              catch  JSONException e                e printStackTrace                      try               connectivityManager    ConnectivityManager  context                      getSystemService Context CONNECTIVITY SERVICE                NetworkInfo networkInfo   connectivityManager getActiveNetworkInfo                Log i  networkInfo   networkInfo toString                 jsonObject put  connected   networkInfo    null  amp  amp  networkInfo isAvailable    amp  amp                      networkInfo isConnected                  jsonObject put  isAvailable   networkInfo isAvailable                  jsonObject put  isConnected   networkInfo isConnected                  jsonObject put  typeName   networkInfo getTypeName                  array put jsonObject               return array toString                catch  Exception e                System out println  CheckConnectivity Exception      e getMessage                 Log v  connectivity   e toString                       array put jsonObject           return array toString

[android] How to check currently internet connection is available or not in android

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