Android Internet connectivity change listener

Question

I already have this code which listens to connectivity change -  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                       if intent getExtras   getBoolean ConnectivityManager EXTRA NO CONNECTIVITY  Boolean FALSE               Log d  app    There s no network connectivity                  And I check Internet connectivity using this code - Internet Check  But the problem is that if network suddenly loses internet connection without any connectivity change  this code is useless  Is there any way to create Broadcast Receiver listener for Internet connectivity change  I have a web app and sudden Internet connectivity changes can cause problems

User · Answer

This my implementation which you can providing in application scope:

class NetworkStateHelper @Inject constructor(
        private val context: Context
) {
    private val cache: BehaviorSubject<Boolean> = BehaviorSubject.create()

    private val receiver = object : BroadcastReceiver() {
        override fun onReceive(c: Context?, intent: Intent?) {
            cache.onNext(isOnlineOrConnecting())
        }
    }

    init {
        val intentFilter = IntentFilter()
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION)
        context.registerReceiver(receiver, intentFilter)
        cache.onNext(isOnlineOrConnecting())
    }

    fun subscribe(): Observable<Boolean> {
        return cache
    }

    fun isOnlineOrConnecting(): Boolean {
        val cm = context.applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val netInfo = cm.activeNetworkInfo
        return netInfo != null && netInfo.isConnectedOrConnecting
    }
}

I used this rxjava and dagger2 libraies

User · Answer

Try this  public class NetworkUtil       public static final int TYPE WIFI   1      public static final int TYPE MOBILE   2      public static final int TYPE NOT CONNECTED   0      public static final int NETWORK STATUS NOT CONNECTED   0      public static final int NETWORK STATUS WIFI   1      public static final int NETWORK STATUS MOBILE   2       public static int getConnectivityStatus Context context            ConnectivityManager cm    ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE            NetworkInfo activeNetwork   cm getActiveNetworkInfo            if  null    activeNetwork                if activeNetwork getType      ConnectivityManager TYPE WIFI                  return TYPE WIFI               if activeNetwork getType      ConnectivityManager TYPE MOBILE                  return TYPE MOBILE                     return TYPE NOT CONNECTED             public static int getConnectivityStatusString Context context            int conn   NetworkUtil getConnectivityStatus context           int status   0          if  conn    NetworkUtil TYPE WIFI                status   NETWORK STATUS WIFI            else if  conn    NetworkUtil TYPE MOBILE                status   NETWORK STATUS MOBILE            else if  conn    NetworkUtil TYPE NOT CONNECTED                status   NETWORK STATUS NOT CONNECTED                    return status            And for the BroadcastReceiver  public class NetworkChangeReceiver extends BroadcastReceiver         Override     public void onReceive final Context context  final Intent intent             int status   NetworkUtil getConnectivityStatusString context           Log e  Sulod sa network reciever    Sulod sa network reciever            if   android net conn CONNECTIVITY CHANGE  equals intent getAction                   if  status    NetworkUtil NETWORK STATUS NOT CONNECTED                    new ForceExitPause context  execute                  else                   new ResumeForceExitPause context  execute                                     Don t forget to put this into your 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  NetworkChangeReceiver          android label  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    Hope this will help you Cheers

User · Answer

I have noticed that no one mentioned WorkManger solution which is better and support most of android devices  You should have a Worker with network constraint AND it will fired only if network available  i e  val constraints   Constraints Builder   setRequiredNetworkType NetworkType CONNECTED  build   val worker   OneTimeWorkRequestBuilder lt MyWorker gt    setConstraints constraints  build    And in worker you do whatever you want once connection back  you may fire the worker periodically   i e  inside dowork   callback  notifierLiveData postValue info

User · Answer

first add dependency in your code as implementation  com treebo internetavailabilitychecker 1 0 4   implements your class with InternetConnectivityListener    public class MainActivity extends AppCompatActivity implements InternetConnectivityListener         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            InternetAvailabilityChecker init this           mInternetAvailabilityChecker   InternetAvailabilityChecker getInstance            mInternetAvailabilityChecker addInternetConnectivityListener this               Override     public void onInternetConnectivityChanged boolean isConnected            if  isConnected                alertDialog   new AlertDialog Builder this  create                alertDialog setTitle   internet is connected or not                alertDialog setMessage  connected                alertDialog setButton AlertDialog BUTTON NEUTRAL   OK                       new DialogInterface OnClickListener                             public void onClick DialogInterface dialog  int which                                dialog dismiss                                                                  alertDialog show               else               alertDialog   new AlertDialog Builder this  create                alertDialog setTitle  internet is connected or not                alertDialog setMessage  not connected                alertDialog setButton AlertDialog BUTTON NEUTRAL   OK                       new DialogInterface OnClickListener                             public void onClick DialogInterface dialog  int which                                dialog dismiss                                                                  alertDialog show

User · Answer

implementation  com treebo internetavailabilitychecker 1 0 1   public class MyApp extends Application        Override     public void onCreate             super onCreate            InternetAvailabilityChecker init this               Override     public void onLowMemory             super onLowMemory            InternetAvailabilityChecker getInstance   removeAllInternetConnectivityChangeListeners

User · Answer

Update      Apps targeting Android 7 0  API level 24  and higher do not receive   CONNECTIVITY ACTION broadcasts if they declare the broadcast receiver   in their manifest  Apps will still receive CONNECTIVITY ACTION   broadcasts if they register their BroadcastReceiver with   Context registerReceiver   and that context is still valid    You need to register the receiver via registerReceiver   method    IntentFilter intentFilter   new IntentFilter  android net conn CONNECTIVITY CHANGE     mCtx registerReceiver new NetworkBroadcastReceiver    intentFilter

User · Answer

This should work   public class ConnectivityChangeActivity extends Activity        private BroadcastReceiver networkChangeReceiver   new BroadcastReceiver              Override         public void onReceive Context context  Intent intent                Log d  app   Network connectivity change                           Override     protected void onResume             super onResume             IntentFilter intentFilter   new IntentFilter            intentFilter addAction ConnectivityManager CONNECTIVITY ACTION           registerReceiver networkChangeReceiver  intentFilter               Override     protected void onPause             super onPause             unregisterReceiver networkChangeReceiver

User · Answer

ConnectivityAction is deprecated in api 28   Instead you can use registerDefaultNetworkCallback as long as you support api 24    In Kotlin   val connectivityManager   context getSystemService Context CONNECTIVITY SERVICE  as ConnectivityManager connectivityManager  let       it registerDefaultNetworkCallback object   ConnectivityManager NetworkCallback             override fun onAvailable network  Network                  take action when network connection is gained                   override fun onLost network  Network                   take action when network connection is lost

User · Answer

Here s the Java code using registerDefaultNetworkCallback  and registerNetworkCallback for API  lt  24    ConnectivityManager NetworkCallback networkCallback   new ConnectivityManager NetworkCallback          Override     public void onAvailable Network network               network available             Override     public void onLost Network network               network unavailable           ConnectivityManager connectivityManager            ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE    if  Build VERSION SDK INT  gt   Build VERSION CODES N        connectivityManager registerDefaultNetworkCallback networkCallback     else       NetworkRequest request   new NetworkRequest Builder                addCapability NetworkCapabilities NET CAPABILITY INTERNET  build        connectivityManager registerNetworkCallback request  networkCallback

[java] Android: Internet connectivity change listener

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