안드로이드 스튜디오 네트웍 체크

	// http://opensource.org/licenses/MIT
	package net.i2p.android.router.util;
	import android.content.Context;
	import android.net.ConnectivityManager;
	import android.net.NetworkInfo;
	import android.telephony.TelephonyManager;
	/**
	* Check device's network connectivity and speed.
	*
	* @author emil http://stackoverflow.com/users/220710/emil
	* @author str4d
	*/
	public class Connectivity {
	/**
	* Get the network info.
	*
	* @param context the Context.
	* @return the active NetworkInfo.
	*/
	public static NetworkInfo getNetworkInfo(Context context) {
	ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	return cm.getActiveNetworkInfo();
	}
	/**
	* Check if there is any connectivity at all.
	*
	* @param context the Context.
	* @return true if we are connected to a network, false otherwise.
	*/
	public static boolean isConnected(Context context) {
	NetworkInfo info = Connectivity.getNetworkInfo(context);
	// Works on emulator and devices.
	// Note the use of isAvailable() - without this, isConnected() can
	// return true when Wifi is disabled.
	// http://stackoverflow.com/a/2937915
	return (info != null && info.isAvailable() && info.isConnected());
	}
	/**
	* Check if there is any connectivity to a Wifi network.
	*
	* @param context the Context.
	* @return true if we are connected to a Wifi network, false otherwise.
	*/
	public static boolean isConnectedWifi(Context context) {
	NetworkInfo info = Connectivity.getNetworkInfo(context);
	return (info != null && info.isAvailable() && info.isConnected() &&
	info.getType() == ConnectivityManager.TYPE_WIFI);
	}
	/**
	* Check if there is any connectivity to a mobile network.
	*
	* @param context the Context.
	* @return true if we are connected to a mobile network, false otherwise.
	*/
	public static boolean isConnectedMobile(Context context) {
	NetworkInfo info = Connectivity.getNetworkInfo(context);
	return (info != null && info.isAvailable() && info.isConnected() &&
	info.getType() == ConnectivityManager.TYPE_MOBILE);
	}
	/**
	* Check if there is fast connectivity.
	*
	* @param context the Context.
	* @return true if we have "fast" connectivity, false otherwise.
	*/
	public static boolean isConnectedFast(Context context) {
	NetworkInfo info = Connectivity.getNetworkInfo(context);
	return (info != null && info.isAvailable() && info.isConnected() &&
	Connectivity.isConnectionFast(info.getType(), info.getSubtype()));
	}
	/**
	* Check if the connection is fast.
	*
	* @param type the network type.
	* @param subType the network subtype.
	* @return true if the provided type/subtype combination is classified as fast.
	*/
	public static boolean isConnectionFast(int type, int subType) {
	if (type == ConnectivityManager.TYPE_WIFI) {
	return true;
	} else if (type == ConnectivityManager.TYPE_MOBILE) {
	switch (subType) {
	case TelephonyManager.NETWORK_TYPE_1xRTT:
	return false; // ~ 50-100 kbps
	case TelephonyManager.NETWORK_TYPE_CDMA:
	return false; // ~ 14-64 kbps
	case TelephonyManager.NETWORK_TYPE_EDGE:
	return false; // ~ 50-100 kbps
	case TelephonyManager.NETWORK_TYPE_EVDO_0:
	return true; // ~ 400-1000 kbps
	case TelephonyManager.NETWORK_TYPE_EVDO_A:
	return true; // ~ 600-1400 kbps
	case TelephonyManager.NETWORK_TYPE_GPRS:
	return false; // ~ 100 kbps
	case TelephonyManager.NETWORK_TYPE_HSDPA:
	return true; // ~ 2-14 Mbps
	case TelephonyManager.NETWORK_TYPE_HSPA:
	return true; // ~ 700-1700 kbps
	case TelephonyManager.NETWORK_TYPE_HSUPA:
	return true; // ~ 1-23 Mbps
	case TelephonyManager.NETWORK_TYPE_UMTS:
	return true; // ~ 400-7000 kbps
	/*
	* Above API level 7, make sure to set android:targetSdkVersion
	* to appropriate level to use these
	*/
	case TelephonyManager.NETWORK_TYPE_EHRPD: // API level 11
	return true; // ~ 1-2 Mbps
	case TelephonyManager.NETWORK_TYPE_EVDO_B: // API level 9
	return true; // ~ 5 Mbps
	case TelephonyManager.NETWORK_TYPE_HSPAP: // API level 13
	return true; // ~ 10-20 Mbps
	case TelephonyManager.NETWORK_TYPE_IDEN: // API level 8
	return false; // ~25 kbps
	case TelephonyManager.NETWORK_TYPE_LTE: // API level 11
	return true; // ~ 10+ Mbps
	// Unknown
	case TelephonyManager.NETWORK_TYPE_UNKNOWN:
	default:
	return false;
	}
	} else {
	return false;
	}
	}
	}

사용법 연구중 

구현 방법 아시는 분 있으면 부탁 드립니다.

getcontext 에서 계속 에러가 나네요