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Editorial Team
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Asked: 2026-05-21T15:38:59+00:00

I understand that on a wifi network there are sudden disconnections which prevent me

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I understand that on a wifi network there are sudden disconnections which prevent me from sending messages to my server.

But sometimes there’s still one last chance before the disconnection, for example if the signal is low or the user is trying to turn off the wifi. On those occasions I would like to send a logout message to my server.

How do I detect disconnections like those?

I tried to retrieve changes of connectivity by registering a broadcast listener:

registerReceiver(this,new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
...
public void onReceive(Context context, Intent intent) {
  NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
  if( (info.getState()== State.DISCONNECTING) && (info.getType() == ConnectivityManager.TYPE_WIFI) ) {
    //send logout
  }

But it looks like at that time it’s already too late. My logout message doesn’t go through.

Is there a better way?

[Update 1]
I also tried:

if( (info.getDetailedState()== DetailedState.DISCONNECTING) && connectionTypeOK ) {

[Update 2 – SOLUTION]
The solution is, as stated below, using a combination of receiving the RSSI_CHANGED_ACTION and WIFI_STATE_CHANGED_ACTION broadcasts to monitor the signal strength and the WIFI_STATE_DISABLING events respectively. When this happens, I send my logout request. This works exactly as I needed. Thanks!!

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1 Answer

  1. Editorial Team

    You could try to implement a variable “heartbeat” function, by using WifiManager to detect changes in signal strength. Here you can find some related code, btw.

    Now, once you receive a RSSI_CHANGED notification, according to the corresponding signal strength, you will update the frequency of your app’s “heartbeats” to the server: if the signal is strong, you will only need to notify the server infrequently that the app is alive. Once the signal becomes week, however, just like adrenaline kicking in for a real live being, so should your app notify the server more frequently. If the signal’s strength recovers, you’ll send a specific message to let the server know everything is all right again; if, however, the server does not receive this message in a certain period of time and the “heartbeat” stops – your app ceases notifications for that amount of time – then the server logs it out until receiving from it again.

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