Broadcast receiver for checking internet connection in android app

Question

I am developing an android broadcast receiver for checking internet connection   The problem is that my broadcast receiver is being called two times  I want it to get called only when the network is available  If it is unavailable  I don t want notified   This is the broadcast receiver  public class NetworkChangeReceiver extends BroadcastReceiver         Override     public void onReceive final Context context  final Intent intent            final ConnectivityManager connMgr    ConnectivityManager  context                  getSystemService Context CONNECTIVITY SERVICE            final android net NetworkInfo wifi   connMgr                  getNetworkInfo ConnectivityManager TYPE WIFI            final android net NetworkInfo mobile   connMgr                  getNetworkInfo ConnectivityManager TYPE MOBILE            if  wifi isAvailable      mobile isAvailable                     Do something              Log d  Network Available     Flag No 1                        This is the manifest xml   lt manifest xmlns android  http   schemas android com apk res android      package  com example broadcastreceiverforinternetconnection      android versionCode  1      android versionName  1 0   gt        lt uses-sdk         android minSdkVersion  8          android targetSdkVersion  17    gt       lt uses-permission android name  android permission ACCESS NETWORK STATE   gt        lt application         android allowBackup  true          android icon   drawable ic launcher          android label   string app name          android theme   style AppTheme   gt           lt receiver android name   NetworkChangeReceiver   gt               lt intent-filter gt                   lt action android name  android net conn CONNECTIVITY CHANGE    gt                   lt action android name  android net wifi WIFI STATE CHANGED    gt               lt  intent-filter gt           lt  receiver gt       lt  application gt    lt  manifest gt

User · Answer

Use this method to check the network state:

private void checkInternetConnection() {

    if (br == null) {

        br = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {

                Bundle extras = intent.getExtras();

                NetworkInfo info = (NetworkInfo) extras
                        .getParcelable("networkInfo");

                State state = info.getState();
                Log.d("TEST Internet", info.toString() + " "
                        + state.toString());

                if (state == State.CONNECTED) {
                      Toast.makeText(getApplicationContext(), "Internet connection is on", Toast.LENGTH_LONG).show();

                } else {
                       Toast.makeText(getApplicationContext(), "Internet connection is Off", Toast.LENGTH_LONG).show();
                }

            }
        };

        final IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver((BroadcastReceiver) br, intentFilter);
    }
}

remember to unregister service in onDestroy.

Cheers!!

User · Answer

Answer to your first question  Your broadcast receiver is being called two times because   You have added two  lt intent-filter gt     Change in network connection    lt action android name  android net conn CONNECTIVITY CHANGE    gt  Change in WiFi state   lt action android name  android net wifi WIFI STATE CHANGED    gt    Just use one    lt action android name  android net conn CONNECTIVITY CHANGE    gt    It will respond to only one action instead of two  See here for more information   Answer to your second question  you want receiver to call only one time if internet connection available    Your code is perfect  you notify only when internet is available   UPDATE  You can use this method to check your connectivity if you want just to check whether mobile is connected with the internet or not   public boolean isOnline Context context         ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE       NetworkInfo netInfo   cm getActiveNetworkInfo          should check null because in airplane mode it will be null     return  netInfo    null  amp  amp  netInfo isConnected

User · Answer

It s easier to use https   github com JobGetabu DroidNet    Override     public void onInternetConnectivityChanged boolean isConnected             if  isConnected                  do Stuff with internet             netIsOn              else                 no internet             netIsOff                         private void netIsOn             private void netIsOff

User · Answer

public class NetworkChangeReceiver extends BroadcastReceiver         Override     public void onReceive final Context context  final Intent intent            if  checkInternet context                 Toast makeText context   quot Network Available Do operations quot   Toast LENGTH LONG  show                         boolean checkInternet Context context            ServiceManager serviceManager   new ServiceManager context           return serviceManager isNetworkAvailable            ServiceManager java public class ServiceManager        Context context       public ServiceManager Context base            context   base             public boolean isNetworkAvailable             ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           NetworkInfo networkInfo   cm getActiveNetworkInfo            return networkInfo    null  amp  amp  networkInfo isConnected             permissions    lt uses-permission android name  quot android permission ACCESS NETWORK STATE quot    gt    lt uses-permission android name  quot android permission INTERNET quot    gt

User · Answer

1  In manifest   - call receiver like below code   lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools      package  com safal checkinternet  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 roundIcon   mipmap ic launcher round          android supportsRtl  true          android theme   style AppTheme          tools ignore  AllowBackup GoogleAppIndexingWarning  gt           lt receiver android name   NetworkChangeReceiver   gt               lt intent-filter gt                   lt action android name  android net conn CONNECTIVITY CHANGE    gt               lt  intent-filter gt           lt  receiver 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    2  Make one Broad Cast Receiver Class  - In This class add code of Network Check  package com safal checkinternet   import android content BroadcastReceiver  import android content Context  import android content Intent  import android net ConnectivityManager  import android net NetworkInfo  import android util Log  import android widget Toast   public class NetworkChangeReceiver extends BroadcastReceiver         Override     public void onReceive final Context context  final Intent intent            if  isOnline context                Toast makeText context   Available   Toast LENGTH SHORT  show             else               Toast makeText context   Not Available   Toast LENGTH SHORT  show                        public boolean isOnline Context context             ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           assert cm    null          NetworkInfo netInfo   cm getActiveNetworkInfo            return  netInfo    null  amp  amp  netInfo isConnected                    3  In your Activity call to Broad Cast Receiver   -  package com safal checkinternet   import androidx appcompat app AppCompatActivity   import android content Intent  import android content IntentFilter  import android os Bundle   public class MainActivity extends AppCompatActivity         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main     Call Broad cast Receiver          IntentFilter filter   new IntentFilter            filter addAction  android net conn CONNECTIVITY CHANGE            registerReceiver new NetworkChangeReceiver    filter

User · Answer

First of all we will make a class that will check the connectivity of the network state  So lets create a class    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            Now Make a new Broadcast receiver class    public class ConnectivityReceiver extends BroadcastReceiver        Override     public void onReceive Context context  Intent intent            if  AppStatus getInstance context  isOnline                   Intent intent1 new Intent context DisplayAct class               intent1 setFlags Intent FLAG ACTIVITY NEW TASK               context startActivity intent1                 else                Toast makeText context   Please    Make your network ON   Toast LENGTH SHORT  show                         and Now register your broadcast receiver on manifest    lt receiver android name   ConnectivityReceiver  gt               lt intent-filter gt                   lt action android name  android net conn CONNECTIVITY CHANGE   gt               lt  intent-filter gt           lt  receiver gt

User · Answer

public static boolean isNetworkAvailable Context context            boolean isMobile   false  isWifi   false           NetworkInfo   infoAvailableNetworks   getConnectivityManagerInstance                  context  getAllNetworkInfo             if  infoAvailableNetworks    null                for  NetworkInfo network   infoAvailableNetworks                     if  network getType      ConnectivityManager TYPE WIFI                        if  network isConnected    amp  amp  network isAvailable                            isWifi   true                                    if  network getType      ConnectivityManager TYPE MOBILE                        if  network isConnected    amp  amp  network isAvailable                            isMobile   true                                                     return isMobile    isWifi            You can write such method somewhere in utility class and call it NetworkChangeReceiver like below    public class NetworkChangedReceiver extends BroadcastReceiver     Override     public void onReceive Context context  Intent intent             if  isNetworkAvailable context                                   Toast makeText context   Network Available Do operations  Toast LENGTH LONG  show                       This above broadcast receiver will be called only when Network state change to connected and not on disconnected

User · Answer

Add permissions    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt    lt uses-permission android name  android permission INTERNET    gt    Create Receiver to check for connection  public class NetworkChangeReceiver extends BroadcastReceiver         Override     public void onReceive final Context context  final Intent intent             if checkInternet context                         Toast makeText context   Network Available Do operations  Toast LENGTH LONG  show                           boolean checkInternet Context context            ServiceManager serviceManager   new ServiceManager context           if  serviceManager isNetworkAvailable                  return true            else               return false                       ServiceManager java  public class ServiceManager        Context context       public ServiceManager Context base            context   base             public boolean isNetworkAvailable             ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           NetworkInfo networkInfo   cm getActiveNetworkInfo            return networkInfo    null  amp  amp  networkInfo isConnected

User · Answer

Here s a comfortable way to do it for activity  fragment or context  It will also auto-unregister if you do it for activity fragment  in onDestroy   if you wish   abstract class ConnectionBroadcastReceiver   BroadcastReceiver         companion object            JvmStatic         fun registerWithoutAutoUnregister context  Context  connectionBroadcastReceiver  ConnectionBroadcastReceiver                context registerReceiver connectionBroadcastReceiver  IntentFilter ConnectivityManager CONNECTIVITY ACTION                       JvmStatic         fun registerToFragmentAndAutoUnregister context  Context  fragment  Fragment  connectionBroadcastReceiver  ConnectionBroadcastReceiver                val applicationContext   context applicationContext             registerWithoutAutoUnregister applicationContext  connectionBroadcastReceiver              fragment lifecycle addObserver object   LifecycleObserver                    OnLifecycleEvent Lifecycle Event ON DESTROY                  fun onDestroy                         applicationContext unregisterReceiver connectionBroadcastReceiver                                                       JvmStatic         fun registerToActivityAndAutoUnregister activity  AppCompatActivity  connectionBroadcastReceiver  ConnectionBroadcastReceiver                registerWithoutAutoUnregister activity  connectionBroadcastReceiver              activity lifecycle addObserver object   LifecycleObserver                    OnLifecycleEvent Lifecycle Event ON DESTROY                  fun onDestroy                         activity unregisterReceiver connectionBroadcastReceiver                                                       JvmStatic         fun hasInternetConnection context  Context   Boolean               val info    context getSystemService Context CONNECTIVITY SERVICE  as ConnectivityManager  activeNetworkInfo             return   info    null     info isConnectedOrConnecting                       override fun onReceive context  Context  intent  Intent            val hasConnection    intent getBooleanExtra ConnectivityManager EXTRA NO CONNECTIVITY  false            Log d  AppLog    conenctivity changed  hasConnection   hasConnection           onConnectionChanged hasConnection             abstract fun onConnectionChanged hasConnection  Boolean      Usage in fragment       ConnectionBroadcastReceiver registerToFragmentAndAutoUnregister activity    this  object   ConnectionBroadcastReceiver             override fun onConnectionChanged hasConnection  Boolean                   Log d  AppLog    onConnectionChanged     hasConnection

User · Answer

Warning  Declaring a broadcastreceiver for android net conn CONNECTIVITY CHANGE is deprecated for apps targeting N and higher  In general  apps should not rely on this broadcast and instead use JobScheduler or GCMNetworkManager   As CONNECTIVITY CHANGE is deprecated then we should use another way of doing the same stuff   Following NetworkConnectionLiveData will handle all the OS Version till now and also if target SDK is less than Build VERSION CODES LOLLIPOP then only we can use broadcastReceiver  Best Part is this class uses LiveData so no need to register any receiver use LiveData and it will handle all the things  class NetworkConnectionLiveData val context  Context    LiveData lt Boolean gt           private var connectivityManager  ConnectivityManager   context getSystemService CONNECTIVITY SERVICE  as ConnectivityManager      private lateinit var connectivityManagerCallback  ConnectivityManager NetworkCallback      override fun onActive             super onActive           updateConnection           when               Build VERSION SDK INT  gt   Build VERSION CODES N - gt  connectivityManager registerDefaultNetworkCallback getConnectivityManagerCallback                Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP - gt  lollipopNetworkAvailableRequest               else - gt                    if  Build VERSION SDK INT  lt  Build VERSION CODES LOLLIPOP                        context registerReceiver networkReceiver  IntentFilter  android net conn CONNECTIVITY CHANGE                                                         override fun onInactive             super onInactive           if  Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP                connectivityManager unregisterNetworkCallback connectivityManagerCallback            else               context unregisterReceiver networkReceiver                        TargetApi Build VERSION CODES LOLLIPOP      private fun lollipopNetworkAvailableRequest             val builder   NetworkRequest Builder                    addTransportType android net NetworkCapabilities TRANSPORT CELLULAR                   addTransportType android net NetworkCapabilities TRANSPORT WIFI          connectivityManager registerNetworkCallback builder build    getConnectivityManagerCallback               private fun getConnectivityManagerCallback    ConnectivityManager NetworkCallback           if  Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP                 connectivityManagerCallback   object   ConnectivityManager NetworkCallback                     override fun onAvailable network  Network                         postValue true                                     override fun onLost network  Network                         postValue false                                              return connectivityManagerCallback           else               throw IllegalAccessError  Should not happened                        private val networkReceiver   object   BroadcastReceiver             override fun onReceive context  Context  intent  Intent                updateConnection                        private fun updateConnection             val activeNetwork  NetworkInfo    connectivityManager activeNetworkInfo         postValue activeNetwork  isConnected    true             Use of the LiveData into any class   NetworkConnectionLiveData context    return       observe viewLifecycleOwner  Observer   isConnected - gt          if   isConnected                   Internet Not Available             return Observer                      Internet Available

User · Answer

I know this thread is old and fully answered but I feel that the following might help some people   The code in the body of the question contains a bug which no one here addressed   Nikhil is checking whether the wifi mobile is available and not if it s connected   The fix is here    Override public void onReceive final Context context  final Intent intent        final ConnectivityManager connMgr    ConnectivityManager  context              getSystemService Context CONNECTIVITY SERVICE        final android net NetworkInfo wifi   connMgr              getNetworkInfo ConnectivityManager TYPE WIFI        final android net NetworkInfo mobile   connMgr              getNetworkInfo ConnectivityManager TYPE MOBILE        if  wifi isConnected      mobile isConnected               do stuff

User · Answer

Try with this   public class ConnectionBroadcastReceiver extends BroadcastReceiver    Override public void onReceive Context context  Intent intent          if   lt Check internet connection available  gt              Toast makeText context   connect to the internet   Toast LENGTH LONG  show               upload background upload service           Intent serviceIntent   new Intent context  lt your service class gt            context startService serviceIntent          else          Toast makeText context   Connection failed   Toast LENGTH LONG  show                     As soon as internet connection trigger  this  BroadcastReciever  will be loaded

User · Answer

public class AsyncCheckInternet extends AsyncTask lt String  Void  Boolean gt     public static final int TIME OUT   10   1000   private OnCallBack listener   public interface OnCallBack        public void onBack Boolean value      public AsyncCheckInternet OnCallBack listener        this listener   listener      Override protected void onPreExecute         Override protected Boolean doInBackground String    params         ConnectivityManager connectivityManager    ConnectivityManager  General context              getSystemService Context CONNECTIVITY SERVICE        NetworkInfo networkInfo   connectivityManager getActiveNetworkInfo         if   networkInfo    null  amp  amp  networkInfo isConnected                 amp  amp    networkInfo getType      ConnectivityManager TYPE WIFI      networkInfo                      getType      ConnectivityManager TYPE MOBILE              HttpURLConnection urlc          try               urlc    HttpURLConnection   new URL  http   www google com                        openConnection                 urlc setConnectTimeout TIME OUT               urlc connect                if  urlc getResponseCode      HttpURLConnection HTTP OK                    return true                else                   return false                          catch  MalformedURLException e                e printStackTrace                return false             catch  IOException e                e printStackTrace                return false                   else           return false            Override protected void onPostExecute Boolean result        if  listener    null            listener onBack result

User · Answer

CONNECTIVITY ACTION docs      Apps targeting Android 7 0  API level 24  and higher do not receive this broadcast if they declare the broadcast receiver in their manifest  Apps will still receive broadcasts if they register their BroadcastReceiver with Context registerReceiver   and that context is still valid

User · Answer

This only checks if the network interface is available  doesn t guarantee a particular network service is available  for example  there could be low signal or server downtime    private boolean isNetworkInterfaceAvailable Context context            ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           NetworkInfo activeNetwork   cm getActiveNetworkInfo            return activeNetwork    null  amp  amp  activeNetwork isConnectedOrConnecting            if you want to make a real connection to make sure your connection can gather data from a server or any url     private boolean isAbleToConnect String url  int timeout            try               URL myUrl   new URL url               URLConnection connection   myUrl openConnection                connection setConnectTimeout timeout               connection connect                return true            catch  Exception e                Log i  exception        e getMessage                 return false                    This function needs to be wrapped in a background thread    final String action   intent getAction            if  intent getAction   equals ConnectivityManager CONNECTIVITY ACTION                 checkConnectivity context                         private void checkConnectivity final Context context            if   isNetworkInterfaceAvailable context                 Toast makeText context   You are OFFLINE    Toast LENGTH SHORT  show                return                     final Handler handler   new Handler            new Thread new Runnable                  Override             public void run                     final boolean isConnected   isAbleToConnect  http   www google com   1000                   handler post new Runnable                          Override                     public void run                             if  isConnected                              Toast makeText context   You are ONLINE    Toast LENGTH SHORT  show                            else                             Toast makeText context   You are OFFLINE    Toast LENGTH SHORT  show                                                                        start             Add required permissions    lt uses-permission android name  android permission ACCESS NETWORK STATE    gt           lt uses-permission android name  android permission INTERNET   gt    Add this line under application in manifest file    android usesCleartextTraffic  true    Add receiver to manifest file    lt receiver android name   ConnectivityChangeReceiver   gt               lt intent-filter gt                    lt action android name  android net conn CONNECTIVITY CHANGE    gt               lt  intent-filter gt           lt  receiver gt        Register Unregister the BR in you Activity    Override     protected void onStart             super onStart            IntentFilter filter   new IntentFilter  android net conn CONNECTIVITY CHANGE            registerReceiver connectivityChangeReceiver  filter               Override     protected void onDestroy             super onDestroy            unregisterReceiver connectivityChangeReceiver           this is the entire Broadcast class     import android content BroadcastReceiver  import android content Context  import android content Intent  import android net ConnectivityManager  import android net NetworkInfo  import android os Handler  import android util Log  import android widget Toast   import java net URL  import java net URLConnection   public class ConnectivityChangeReceiver extends BroadcastReceiver          Override     public void onReceive final Context context  final Intent intent             final String action   intent getAction            if  intent getAction   equals ConnectivityManager CONNECTIVITY ACTION                 checkConnectivity context                         private void checkConnectivity final Context context            if   isNetworkInterfaceAvailable context                 Toast makeText context   You are OFFLINE    Toast LENGTH SHORT  show                return                     final Handler handler   new Handler            new Thread new Runnable                  Override             public void run                     final boolean isConnected   isAbleToConnect  http   www google com   1000                   handler post new Runnable                          Override                     public void run                             if  isConnected                              Toast makeText context   You are ONLINE    Toast LENGTH SHORT  show                            else                             Toast makeText context   You are OFFLINE    Toast LENGTH SHORT  show                                                                        start                  This only checks if the network interface is available  doesn t guarantee a particular network service is available  for example  there could be low signal or server downtime     private boolean isNetworkInterfaceAvailable Context context            ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           NetworkInfo activeNetwork   cm getActiveNetworkInfo            return activeNetwork    null  amp  amp  activeNetwork isConnectedOrConnecting                 This makes a real connection to an url and checks if you can connect to this url  this needs to be wrapped in a background thread     private boolean isAbleToConnect String url  int timeout            try               URL myUrl   new URL url               URLConnection connection   myUrl openConnection                connection setConnectTimeout timeout               connection connect                return true            catch  Exception e                Log i  exception        e getMessage                 return false

User · Answer

manifest    lt receiver android name   your namepackage here ConnectivityReceiver  gt       lt intent-filter gt           lt action android name  android net conn CONNECTIVITY CHANGE   gt       lt  intent-filter gt   lt  receiver gt    class for receiver   public class ConnectivityReceiver extends BroadcastReceiver        Override     public void onReceive Context context  Intent intent            final String action   intent getAction            switch  action                case ConnectivityManager CONNECTIVITY ACTION                  DebugUtils logDebug  BROADCAST    network change                    if NetworkUtils isConnect                           do action here                               break                      and classs utils like example   public class NetworkUtils        public static boolean isConnect             ConnectivityManager connectivityManager    ConnectivityManager  Application getInstance   getSystemService Context CONNECTIVITY SERVICE           if  Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP                Network   netArray   connectivityManager getAllNetworks                NetworkInfo netInfo              for  Network net   netArray                    netInfo   connectivityManager getNetworkInfo net                   if   netInfo getTypeName   equalsIgnoreCase  WIFI      netInfo getTypeName   equalsIgnoreCase  MOBILE     amp  amp  netInfo isConnected    amp  amp  netInfo isAvailable                            if  netInfo getState   equals NetworkInfo State CONNECTED                         Log d  Network    NETWORKNAME      netInfo getTypeName                         return true                                            else               if  connectivityManager    null                     SuppressWarnings  deprecation                   NetworkInfo   netInfoArray   connectivityManager getAllNetworkInfo                    if  netInfoArray    null                        for  NetworkInfo netInfo   netInfoArray                            if   netInfo getTypeName   equalsIgnoreCase  WIFI      netInfo getTypeName   equalsIgnoreCase  MOBILE     amp  amp  netInfo isConnected    amp  amp  netInfo isAvailable                                    if  netInfo getState      NetworkInfo State CONNECTED                                Log d  Network    NETWORKNAME      netInfo getTypeName                                 return true                                                                                                    return false

User · Answer

Checking internet status every time using Broadcast Receiver     Full source code available on Google Drive   AndroidManifest xml   lt uses-permission android name  android permission ACCESS NETWORK STATE   gt   lt uses-permission android name  android permission INTERNET   gt   lt receiver android name   receivers NetworkChangeReceiver  gt               lt intent-filter gt                   lt action android name  android net conn CONNECTIVITY CHANGE    gt               lt  intent-filter gt   lt  receiver gt    BroadcastReciever  package com keshav networkchangereceiverexample receivers   import android content BroadcastReceiver  import android content Context  import android content Intent  import android net ConnectivityManager  import android net NetworkInfo  import android util Log   import static com keshav networkchangereceiverexample MainActivity dialog   public class NetworkChangeReceiver extends BroadcastReceiver        Override     public void onReceive Context context  Intent intent                try                       if  isOnline context                     dialog true                   Log e  keshav    Online Connect Intenet                   else                   dialog false                   Log e  keshav    Conectivity Failure                                 catch  NullPointerException e                e printStackTrace                         private boolean isOnline Context context            try               ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE               NetworkInfo netInfo   cm getActiveNetworkInfo                  should check null because in airplane mode it will be null             return  netInfo    null  amp  amp  netInfo isConnected               catch  NullPointerException e                e printStackTrace                return false                      MainActivity java  package com keshav networkchangereceiverexample   import android content BroadcastReceiver  import android content Intent  import android content IntentFilter  import android graphics Color  import android net ConnectivityManager  import android os Build  import android os Handler  import android os Looper  import android support v7 app AppCompatActivity  import android os Bundle  import android util Log  import android view View  import android view animation Animation  import android view animation AnimationUtils  import android widget TextView   import com keshav networkchangereceiverexample receivers NetworkChangeReceiver   public class MainActivity extends AppCompatActivity        private BroadcastReceiver mNetworkReceiver      static TextView tv check connection        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           tv check connection  TextView  findViewById R id tv check connection           mNetworkReceiver   new NetworkChangeReceiver            registerNetworkBroadcastForNougat                public static void dialog boolean value            if value               tv check connection setText  We are back                    tv check connection setBackgroundColor Color GREEN               tv check connection setTextColor Color WHITE                Handler handler   new Handler                Runnable delayrunnable   new Runnable                      Override                 public void run                         tv check connection setVisibility View GONE                                                handler postDelayed delayrunnable  3000            else               tv check connection setVisibility View VISIBLE               tv check connection setText  Could not Connect to internet                tv check connection setBackgroundColor Color RED               tv check connection setTextColor Color WHITE                         private void registerNetworkBroadcastForNougat             if  Build VERSION SDK INT  gt   Build VERSION CODES N                registerReceiver mNetworkReceiver  new IntentFilter ConnectivityManager CONNECTIVITY ACTION                      if  Build VERSION SDK INT  gt   Build VERSION CODES M                registerReceiver mNetworkReceiver  new IntentFilter ConnectivityManager CONNECTIVITY ACTION                         protected void unregisterNetworkChanges             try               unregisterReceiver mNetworkReceiver             catch  IllegalArgumentException e                e printStackTrace                          Override     public void onDestroy             super onDestroy            unregisterNetworkChanges              activity main xml   lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      tools context  com keshav networkchangereceiverexample MainActivity  gt        lt TextView         android id    id tv check connection          android layout width  match parent          android layout height  wrap content          android text  Connection establised            android padding  25dp          app layout constraintBottom toBottomOf  parent          android gravity  center          app layout constraintLeft toLeftOf  parent          app layout constraintRight toRightOf  parent          app layout constraintTop toTopOf  parent    gt    lt  LinearLayout gt

User · Answer

Broadcast receiver code to check internet connectivity change   public class BroadCastDetecter extends BroadcastReceiver       public static boolean internet status   false      public static void checkInternetConenction Context context            internet status   false          ConnectivityManager check    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE           if  check    null                NetworkInfo   info   check getAllNetworkInfo                if  info    null                  for  int i   0  i  lt  info length  i                                          if  info i  getState      NetworkInfo State CONNECTED                            internet status   true                                                      if internet status                                 do what you want to if internet connection is available                                     Override     public void onReceive Context context  Intent intent                try               checkInternetConenction context            catch Exception e                        add this in manifest file     lt receiver android name   BroadCastDetecter  gt               lt intent-filter gt                   lt action android name  android net conn CONNECTIVITY CHANGE    gt               lt  intent-filter gt           lt  receiver gt

User · Answer

Add a broadcast receiver which can listen to network connectivity change  Then check wether device is connected to internet or not using ConnectivityManager  Refer to this post or video for detailed understanding  Below is the code   public class NetworkStateChangeReceiver extends BroadcastReceiver     public static final String NETWORK AVAILABLE ACTION    com ajit singh NetworkAvailable     public static final String IS NETWORK AVAILABLE    isNetworkAvailable       Override   public void onReceive Context context  Intent intent        Intent networkStateIntent   new Intent NETWORK AVAILABLE ACTION       networkStateIntent putExtra IS NETWORK AVAILABLE   isConnectedToInternet context        LocalBroadcastManager getInstance context  sendBroadcast networkStateIntent          private boolean isConnectedToInternet Context context        try         if  context    null            ConnectivityManager connectivityManager    ConnectivityManager  context getSystemService CONNECTIVITY SERVICE           NetworkInfo networkInfo   connectivityManager getActiveNetworkInfo            return networkInfo    null  amp  amp  networkInfo isConnected                  return false        catch  Exception e          Log e NetworkStateChangeReceiver class getName    e getMessage           return false                I wrote this receiver to show a notification on the Screen  that s why you see a local broadcast with the network status  Here is the code to show the notification   public class MainActivity extends AppCompatActivity       Override   protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main        IntentFilter intentFilter   new IntentFilter NetworkStateChangeReceiver NETWORK AVAILABLE ACTION       LocalBroadcastManager getInstance this  registerReceiver new BroadcastReceiver            Override       public void onReceive Context context  Intent intent            boolean isNetworkAvailable   intent getBooleanExtra IS NETWORK AVAILABLE  false           String networkStatus   isNetworkAvailable    connected     disconnected            Snackbar make findViewById R id activity main    Network Status      networkStatus  Snackbar LENGTH LONG  show                   intentFilter           Activity listens to the intent broadcasted by the network receiver and shows the notification on the screen

User · Answer

Complete answer here  Menifest file   lt uses-permission android name  android permission ACCESS NETWORK STATE    gt   lt uses-permission android name  android permission CHANGE NETWORK STATE    gt   lt uses-permission android name  android permission INTERNET    gt    lt receiver android name   NetworkStateReceiver  gt       lt intent-filter gt         lt action android name  android net conn CONNECTIVITY CHANGE    gt       lt  intent-filter gt     lt  receiver gt    BroadecardReceiver class  public class NetworkStateReceiver extends BroadcastReceiver       public void onReceive Context context  Intent intent         Log d  app   Network connectivity change         if intent getExtras    null            NetworkInfo ni  NetworkInfo  intent getExtras   get ConnectivityManager EXTRA NETWORK INFO           if ni  null  amp  amp  ni getState    NetworkInfo State CONNECTED                Log i  app   Network   ni getTypeName     connected              else if intent getBooleanExtra ConnectivityManager EXTRA NO CONNECTIVITY Boolean FALSE                 Log d  app   There s no network connectivity                       Registering receiver in MainActivity   Override protected void onResume         super onResume        IntentFilter intentFilter   new IntentFilter ConnectivityManager CONNECTIVITY ACTION       registerReceiver networkReceiver  intentFilter       Override protected void onPause         super onPause        if  networkReceiver    null          unregisterReceiver networkReceiver       Enjoy

User · Answer

just for someone else who wanna register a broadcast dynamicly   BroadcastReceiver mWifiReceiver   new BroadcastReceiver          Override     public void onReceive Context context  Intent intent            if  checkWifiConnect                  Log d TAG   wifi has connected                   TODO                     private void registerWifiReceiver         IntentFilter filter   new IntentFilter        filter addAction WifiManager NETWORK STATE CHANGED ACTION       filter addAction WifiManager WIFI STATE CHANGED ACTION       filter addAction ConnectivityManager CONNECTIVITY ACTION       mContext registerReceiver mWifiReceiver  filter      private void unregisterWifiReceiver         mContext unregisterReceiver mWifiReceiver      private boolean checkWifiConnect         ConnectivityManager manager    ConnectivityManager  mContext getSystemService Context CONNECTIVITY SERVICE       NetworkInfo networkInfo   manager getActiveNetworkInfo        if  networkInfo    null              amp  amp  networkInfo getType      ConnectivityManager TYPE WIFI              amp  amp  networkInfo isConnected              return true            return false

[java] Broadcast receiver for checking internet connection in android app

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