通過調用WifiManager類：
IntentFilter filter = new IntentFilter();
filter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
final WifiManager wifiManager =
(WifiManager)getApplicationContext().getSystemService(Context.WIFI_SERVICE);;
registerReceiver(new BroadcastReceiver(){
@SuppressLint("UseValueOf") @Override
public void onReceive(Context context, Intent intent) {
sb = new StringBuilder();
scanList = wifiManager.getScanResults();
sb.append("\n Number Of Wifi connections :" + " " +scanList.size()+"\n\n");
for(int i = 0; i < scanList.size(); i++){
sb.append(new Integer(i+1).toString() + ". ");
sb.append((scanList.get(i)).toString());
sb.append("\n\n");
}
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