NetUtils.java

package com.arialyy.frame.util;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.provider.Settings;
import android.telephony.TelephonyManager;
import android.text.TextUtils;

/**
 * 跟网络相关的工具类
 */
public class NetUtils {

    /**
     * 没有网络
     */
    public static final int NETWORK_TYPE_INVALID = 0;
    /**
     * wap网络
     */
    public static final int NETWORK_TYPE_WAP     = 1;
    /**
     * 2G网络
     */
    public static final int NETWORK_TYPE_2G      = 2;
    /**
     * 3G和3G以上网络，或统称为快速网络
     */
    public static final int NETWORK_TYPE_3G      = 3;
    /**
     * wifi网络
     */
    public static final int NETWORK_TYPE_WIFI    = 4;

    private NetUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 判断网络是否连接
     *
     * @param context
     * @return
     */
    public static boolean isConnected(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo         ni = cm.getActiveNetworkInfo();
        return ni != null && ni.isConnectedOrConnecting();
    }

    /**
     * 判断是否是wifi连接
     */
    public static boolean isWifi(Context context) {
        return getNetWorkType(context) == NETWORK_TYPE_WIFI;
    }

    /**
     * 获取网络状态，wifi,wap,2g,3g.
     *
     * @param context 上下文
     * @return int 网络状态 {@link #NETWORK_TYPE_2G},{@link #NETWORK_TYPE_3G},
     * {@link #NETWORK_TYPE_INVALID},{@link #NETWORK_TYPE_WAP},{@link #NETWORK_TYPE_WIFI}
     */
    public static int getNetWorkType(Context context) {
        int                 netWorkType = -1;
        ConnectivityManager manager     = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo         networkInfo = manager.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isConnected()) {
            String type = networkInfo.getTypeName();
            if (type.equalsIgnoreCase("WIFI")) {
                netWorkType = NETWORK_TYPE_WIFI;
            } else if (type.equalsIgnoreCase("MOBILE")) {
                String proxyHost = android.net.Proxy.getDefaultHost();
                netWorkType = TextUtils.isEmpty(proxyHost)
                        ? (isFastMobileNetwork(context) ? NETWORK_TYPE_3G : NETWORK_TYPE_2G)
                        : NETWORK_TYPE_WAP;
            }
        } else {
            netWorkType = NETWORK_TYPE_INVALID;
        }
        return netWorkType;
    }

    private static boolean isFastMobileNetwork(Context context) {
        TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        switch (telephonyManager.getNetworkType()) {
            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
            case TelephonyManager.NETWORK_TYPE_EHRPD:
                return true; // ~ 1-2 Mbps
            case TelephonyManager.NETWORK_TYPE_EVDO_B:
                return true; // ~ 5 Mbps
            case TelephonyManager.NETWORK_TYPE_HSPAP:
                return true; // ~ 10-20 Mbps
            case TelephonyManager.NETWORK_TYPE_IDEN:
                return false; // ~25 kbps
            case TelephonyManager.NETWORK_TYPE_LTE:
                return true; // ~ 10+ Mbps
            case TelephonyManager.NETWORK_TYPE_UNKNOWN:
                return false;
            default:
                return false;
        }
    }

    /**
     * 打开网络设置界面
     */
    public static void openSetting(Context context) {
        if (AndroidVersionUtil.hasHoneycomb()) {
            Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent);
        } else {
            Intent        intent = new Intent("/");
            ComponentName cm     = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
            intent.setComponent(cm);
            intent.setAction("android.intent.action.VIEW");
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent);
        }
    }

}