网络检测类

<pre>

package com.emil.android.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

*/
public class Connectivity {

/**
 * Get the network info
 * @param context
 * @return
 */
public static NetworkInfo getNetworkInfo(Context context){
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    return cm.getActiveNetworkInfo();
}

/**
 * Check if there is any connectivity
 * @param context
 * @return
 */
public static boolean isConnected(Context context){
    NetworkInfo info = Connectivity.getNetworkInfo(context);
    return (info != null && info.isConnected());
}

/**
 * Check if there is any connectivity to a Wifi network
 * @param context
 * @param type
 * @return
 */
public static boolean isConnectedWifi(Context context){
    NetworkInfo info = Connectivity.getNetworkInfo(context);
    return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI);
}

/**
 * Check if there is any connectivity to a mobile network
 * @param context
 * @param type
 * @return
 */
public static boolean isConnectedMobile(Context context){
    NetworkInfo info = Connectivity.getNetworkInfo(context);
    return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE);
}

/**
 * Check if there is fast connectivity
 * @param context
 * @return
 */
public static boolean isConnectedFast(Context context){
    NetworkInfo info = Connectivity.getNetworkInfo(context);
    return (info != null && info.isConnected() && Connectivity.isConnectionFast(info.getType(),info.getSubtype()));
}

/**
 * Check if the connection is fast
 * @param type
 * @param subType
 * @return
 */
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;
    }
}

}

</pre>
记得在AndroidManifest.xml加入：
<pre>

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

</pre>