监听wifi, 3g的开、关的Android代码

    private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {                @Override                public void onReceive(Context context, Intent intent) {                            boolean isWifiConnected = false;                    boolean isMobileConnected = false;                            ConnectivityManager connMgr = (ConnectivityManager)                             context.getSystemService(Context.CONNECTIVITY_SERVICE);                            NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);                            if(networkInfo != null)                    isWifiConnected = networkInfo.isConnected();                            networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);                            if(networkInfo != null)                    isMobileConnected = networkInfo.isConnected();                                  Log.d("network status", "wifi == " + isWifiConnected + " and mobile == " + isMobileConnected);                        }            };  

注册监听：

    registerReceiver(mConnReceiver,                    new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));  

manifest：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />