How to keep my wifi always turn on?

While disconnectiong to the selected wifi AP, my WiFi is turned off.I want to keep my WiFi always turn on while disconnecting to开发者_如何转开发 the the selected AccessPoint and in the meantime WiFi is n't trying to connect to other AP also.Iam using Android 1.5.Is there any solution for this?

Regards, Rajendar

---

mWifi = ((WifiManager)getSystemService( WIFI_SERVICE )).createWifiLock( WifiManager.WIFI_MODE_FULL , "yourtag" );
mWifi.acquire();
// when done
mWifi.release();