动态注册广播，监听网络状态变化，判断网络模式

注册广播监听网络连接和断开状态的变化，判断网络连接模式；

 private ConnectivityManager mConnectivityManager;

 private NetworkInfo netInfo;

/////////////监听网络状态变化的广播接收器

 private BroadcastReceiver myNetReceiver = new BroadcastReceiver() {

 @Override
 public void onReceive(Context context, Intent intent) {

  String action = intent.getAction();
        if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {

            mConnectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
            netInfo = mConnectivityManager.getActiveNetworkInfo();
            if(netInfo != null && netInfo.isAvailable()) {

                 /////////////网络连接
                String name = netInfo.getTypeName();

                if(netInfo.getType()==ConnectivityManager.TYPE_WIFI){
                 /////WiFi网络

                }else if(netInfo.getType()==ConnectivityManager.TYPE_ETHERNET){
                /////有线网络

                }else if(netInfo.getType()==ConnectivityManager.TYPE_MOBILE){
               /////////3g网络

                }
              } else {
             ////////网络断开

            }
        }

   }
   }; 

/////////动态注册广播

       IntentFilter mFilter = new IntentFilter();
       mFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
       registerReceiver(myNetReceiver, mFilter);

/////////解除广播

    if(myNetReceiver!=null){
            unregisterReceiver(myNetReceiver);
        }

-------------------------------------

////判断GPS是否打开

public boolean isGpsEnabled(Context context) {

LocationManager locationManager = ((LocationManager) context

.getSystemService(Context.LOCATION_SERVICE));

List<String> accessibleProviders = locationManager.getProviders(true);

return accessibleProviders != null && accessibleProviders.size() > 0;

}