how to check connectivity in android
 
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;

public class Connectivity {
  
	public static NetworkInfo getNetworkInfo(Context context){
	    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	    return cm.getActiveNetworkInfo();
	}

	public static boolean isConnected(Context context){
	    NetworkInfo info = Connectivity.getNetworkInfo(context);
	    return (info != null && info.isConnected());
	}

	public static boolean isConnectedWifi(Context context){
	    NetworkInfo info = Connectivity.getNetworkInfo(context);
	    return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI);
	}

	public static boolean isConnectedMobile(Context context){
	    NetworkInfo info = Connectivity.getNetworkInfo(context);
	    return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE);
	}

	public static boolean isConnectedFast(Context context){
	    NetworkInfo info = Connectivity.getNetworkInfo(context);
	    return (info != null && info.isConnected() && Connectivity.isConnectionFast(info.getType(),info.getSubtype()));
	}

	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;
		}
	}

}
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