Handle WIFI and connectivity changes

app/src/main/java/de/tu_chemnitz/wlan/MainActivity.java

@@ -75,6 +75,8 @@ public class MainActivity extends AppCompatActivity {
     boolean inInstall = false, canLeaveInstall = false;
     int useCache = 0; // <0 - false ; 0 - undefined ; >0 - true
 
+    private NetworkChangeReciever networkChangeReciever = null;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -141,6 +143,14 @@ public class MainActivity extends AppCompatActivity {
         super.onResume();
 
         recomputeLayout();
+
+        IntentFilter networkChangeRecieverIntentFilter = new IntentFilter();
+        networkChangeRecieverIntentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
+        networkChangeRecieverIntentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
+
+        this.networkChangeReciever = new NetworkChangeReciever();
+        Log.d("network_change_broadcast", "register receiver");
+        this.registerReceiver(this.networkChangeReciever, networkChangeRecieverIntentFilter);
     }
 
     private void recomputeLayout() {
@@ -172,6 +182,14 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
+    @Override
+    protected void onPause() {
+        super.onPause();
+
+        Log.d("network_change_broadcast", "unregister receiver");
+        this.unregisterReceiver(this.networkChangeReciever);
+    }
+
     private void recomputeLayoutStatus() {
         ticks_status = Helper.getNetworkStatus(MainActivity.this, "\"eduroam\"");
 
@@ -806,4 +824,17 @@ public class MainActivity extends AppCompatActivity {
         params.setMargins((subentry ? 50 : 0), 0, 0, 10);
         return params;
     }
-}
+
+    private class NetworkChangeReciever extends BroadcastReceiver {
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            try {
+                Log.d("network_change_broadcast", "Get action: " + intent.getAction());
+                recomputeLayout();
+            } catch (Exception exception) {
+                Log.d("network_change_broadcast", "Error while recompute ticklist", exception);
+            }
+        }
+    }
+}
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