public boolean isNetworkAvailable(Activity activity)	    {	        Context context = activity.getApplicationContext();	        // 获取手机所有连接管理对象（包括对wi-fi,net等连接的管理）	        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);	        	        if (connectivityManager == null)	        {	            return false;	        }	        else	        {	            // 获取NetworkInfo对象	            NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo();	            	            if (networkInfo != null && networkInfo.length > 0)	            {	                for (int i = 0; i < networkInfo.length; i++)	                {	                    System.out.println(i + "===状态===" + networkInfo[i].getState());	                    System.out.println(i + "===类型===" + networkInfo[i].getTypeName());	                    // 判断当前网络状态是否为连接状态	                    if (networkInfo[i].getState() == NetworkInfo.State.CONNECTED)	                    {	                        return true;	                    }	                }	            }	        }	        return false;	    }