WifiManager.NETWORK_STATE_CHANGED_ACTION

监听WIFI

protected void t1() {
    BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            System.out.println("-----------------------------------3---------------");
            System.out.println(intent.getAction());
            if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {
                wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
                if (wifiManager.isWifiEnabled()) {
                    Get_IP();
                    To_Notification_Wifi();
                }
            }
        }
    };
    IntentFilter intentFilter = new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION);
    registerReceiver(broadcastReceiver, intentFilter);
}