How to connect to an unsecure wireless network?

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Java

Mobile

Android

Dear All,
I need your help. I use Android to connect to an unsecure wireless network with the name specified, such as "TEST";
I use blow code for test, but it fails. So could any one help me?

public class WifiConnActivity extends Activity {
    /** Called when the activity is first created. */
	final String tag = "WifiConn:...";
	EditText txt;
	WifiManager mWifi;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mWifi = (WifiManager)getSystemService(Context.WIFI_SERVICE);

        txt = (EditText)findViewById(R.id.editText1);

        Button b1 = (Button)findViewById(R.id.B1);        
        b1.setOnClickListener(new OnClickListener(){
            @Override
        	public void onClick(View v)
        	{
                
                if (mWifi.startScan())
                {
                	Log.d(tag, "startScan()");

                	List<scanresult> sRet = mWifi.getScanResults();

                	for (int i=0; i<sret.size();>                	{
                    	ScanResult retS = sRet.get(i); 
                    	txt.append("resT: " + retS.SSID +" " + retS.BSSID + "\n");
                    	Log.d(tag, "resT: " + retS.SSID +" " + retS.BSSID);
                    	
                    	if (retS.SSID.equalsIgnoreCase("TEST")) // TEST is wireless SSID
                    	{
                        	txt.append("Found: " + retS.SSID +" " + retS.BSSID + "\n");
                   		
                    		WifiConfiguration wc = new WifiConfiguration();

                    		wc.SSID = "\""+retS.SSID+"\"";
                    		wc.BSSID = retS.BSSID;
                    		wc.status = WifiConfiguration.Status.ENABLED;
                    		wc.hiddenSSID = true;
                    		
                    		int netID = mWifi.addNetwork(wc); // add network
                    		txt.append("addNetwork: "+ Integer.toString(netID) +"\n");
                    		
                    		if(mWifi.enableNetwork(netID, true)) // enable network
                    		{
                    			txt.append("enableNetwork: true\n");
                    		}
                    	}
                	}
                	
                }
        	}
        	
        });      
    }    
}