Checking Internet Connection with Broadcast Receiver Not Working

Question

I have a class that checks whether or not the Internet is connected while my application runs:

public class NetworkChangeReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting(); if (isConnected){ Toast.makeText(context, "CONNECTED!", Toast.LENGTH_LONG).show(); }else{ Toast.makeText(context, "NOT CONNECTED", Toast.LENGTH_LONG).show(); } }}

I added this receiver within my manifest file, in between the application brackets

 <receiver android:name=".DataHelpers.NetworkChangeReceiver"//DataHelpers is the package name android:label="NetworkChangeReceiver"> <intent-filter> <action android:name="android.net.conn.CONNECTIVITY_CHANGE" /> <action android:name="android.net.wifi.WIFI_STATE_CHANGED" /> </intent-filter> </receiver>

When I run my app, which relies on the internet, and shut off the connection, shouldn't I be getting a Toast message that says "Connected!"? Shouldn't the receiver recognise that there is no connection and fire off the onReceive() method in my NetworkChangerReceiver class?

No, how do I do that? Could you write an answer? I thought registering just meant including it within the manifest file? — Mark F
– Mark F, Commented Dec 27, 2016 at 14:46

CopsOnRoad · Accepted Answer · 2018-03-31 20:03:31Z

You can try this:

 public class NetworkUtil { public static int TYPE_WIFI = 1; public static int TYPE_MOBILE = 2; public static int TYPE_NOT_CONNECTED = 0; 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 String getConnectivityStatusString(Context context) { int conn = NetworkUtil.getConnectivityStatus(context); String status = null; if (conn == NetworkUtil.TYPE_WIFI) { status = "Wifi enabled"; } else if (conn == NetworkUtil.TYPE_MOBILE) { status = "Mobile data enabled"; } else if (conn == NetworkUtil.TYPE_NOT_CONNECTED) { status = "Not connected to Internet"; } return status; } }

define the BroadcastReceiver:

 public class NetworkChangeReceiver extends BroadcastReceiver { public boolean isConnected = true; String status; Context Cnt; Activity activity; Activity parent; AlertDialog alert; public NetworkChangeReceiver(Activity a) { // TODO Auto-generated constructor stub parent = a; } @Override public void onReceive(final Context context, final Intent intent) { activity = (Activity) context; status = NetworkUtil.getConnectivityStatusString(context); if (status.equals("Not connected to Internet")) { //Toast.makeText(context, "Internet connection required", Toast.LENGTH_LONG).show(); } ReturnStatus(status, context); } public void ReturnStatus(String s, final Context cnt) { if (s.equals("Mobile data enabled")) { isConnected = true; //Intent intent = new Intent(activity,activity.getClass()); //activity.startActivity(intent); } else if (s.equals("Wifi enabled")) { isConnected = true; } else { isConnected = false; final AlertDialog.Builder builder = new AlertDialog.Builder(cnt); // Set the Alert Dialog Message builder.setMessage("Internet connection required") .setCancelable(false) .setPositiveButton("continue", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { activity.finish(); Intent intent = new Intent(activity, activity.getClass()); activity.startActivity(intent); } }) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { if(alert.isShowing()) { isConnected=false; alert.dismiss(); } } }); alert = builder.create(); alert.show(); } } public boolean is_connected() { return isConnected; } }

Now use them in any activity :

public NetworkChangeReceiver receiver; Boolean bl = true; public void checkInternet() { IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION); receiver = new NetworkChangeReceiver(this); registerReceiver(receiver, filter); bl = receiver.is_connected(); Log.d("Boolean ", bl.toString()); }

Unregister the receiver in onPause()

 @Override protected void onPause() { super.onPause(); try { unregisterReceiver(receiver); } catch (Exception e) { } }

CopsOnRoad · Accepted Answer · 2018-03-31 17:14:08Z

0

You still have to register it explicitly in onCreate() or so, with something like

registerReceiver(new NetworkChangeReciever(), new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));

edited Mar 31, 2018 at 17:14

CopsOnRoad

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answered Dec 27, 2016 at 14:55

tibbi

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2 Comments

Mark F Over a year ago

Do I have to do this for every activity or is there a general way to have it run through the entire application?

tibbi Over a year ago

you can do it generally too, by registering it in the Application class. Here is some link with more info stackoverflow.com/a/12834521/1967672

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