此代码有效：

IntentFilter mIntentFilter = new IntentFilter();

mIntentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);

registerReceiver(receiverWifi, mIntentFilter);

class WifiReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context c, Intent intent) {

String action = intent.getAction();

if(action.equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)){

Log.d("WifiReceiver", ">>>>SUPPLICANT_STATE_CHANGED_ACTION<<<<<

SupplicantState supl_state=((SupplicantState)intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE));

switch(supl_state){

case ASSOCIATED:Log.i("SupplicantState", "ASSOCIATED");

break;

case ASSOCIATING:Log.i("SupplicantState", "ASSOCIATING");

break;

case AUTHENTICATING:Log.i("SupplicantState", "Authenticating...");

break;

case COMPLETED:Log.i("SupplicantState", "Connected");

break;

case DISCONNECTED:Log.i("SupplicantState", "Disconnected");

break;

case DORMANT:Log.i("SupplicantState", "DORMANT");

break;

case FOUR_WAY_HANDSHAKE:Log.i("SupplicantState", "FOUR_WAY_HANDSHAKE");

break;

case GROUP_HANDSHAKE:Log.i("SupplicantState", "GROUP_HANDSHAKE");

break;

case INACTIVE:Log.i("SupplicantState", "INACTIVE");

break;

case INTERFACE_DISABLED:Log.i("SupplicantState", "INTERFACE_DISABLED");

break;

case INVALID:Log.i("SupplicantState", "INVALID");

break;

case SCANNING:Log.i("SupplicantState", "SCANNING");

break;

case UNINITIALIZED:Log.i("SupplicantState", "UNINITIALIZED");

break;

default:Log.i("SupplicantState", "Unknown");

break;

}

int supl_error=intent.getIntExtra(WifiManager.EXTRA_SUPPLICANT_ERROR, -1);

if(supl_error==WifiManager.ERROR_AUTHENTICATING){

Log.i("ERROR_AUTHENTICATING", "ERROR_AUTHENTICATING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");

}

}

}

}

android:name=".MyActivity$WifiReceiver"

android:process=":remote" >