Android网络工具类NetworkUtils详解

import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;

/**
 * 网络工具类
 */
public class NetworkUtils {

  public static final int NETWORK_NO = -1;  // no network
  public static final int NETWORK_WIFI = 1;  // wifi network
  public static final int NETWORK_2G = 2;  // "2G" networks
  public static final int NETWORK_3G = 3;  // "3G" networks
  public static final int NETWORK_4G = 4;  // "4G" networks
  public static final int NETWORK_UNKNOWN = 5;  // unknown network

  private static final int NETWORK_TYPE_GSM = 16;
  private static final int NETWORK_TYPE_TD_SCDMA = 17;
  private static final int NETWORK_TYPE_IWLAN = 18;

  /**
   * 打开网络设置界面
   * <p>3.0以下打开设置界面</p>
   *
   * @param context 上下文
   */
  public static void openWirelessSettings(Context context) {
    if (android.os.Build.VERSION.SDK_INT > 10) {
      context.startActivity(new Intent(android.provider.Settings.ACTION_SETTINGS));
    } else {
      context.startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));
    }
  }

  /**
   * 获取活动网络信息
   *
   * @param context 上下文
   * @return NetworkInfo
   */
  private static NetworkInfo getActiveNetworkInfo(Context context) {
    ConnectivityManager cm = (ConnectivityManager) context
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    return cm.getActiveNetworkInfo();
  }

  /**
   * 判断网络是否可用
   * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
   *
   * @param context 上下文
   * @return {@code true}: 可用<br>{@code false}: 不可用
   */
  public static boolean isAvailable(Context context) {
    NetworkInfo info = getActiveNetworkInfo(context);
    return info != null && info.isAvailable();
  }

  /**
   * 判断网络是否连接
   * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
   *
   * @param context 上下文
   * @return {@code true}: 是<br>{@code false}: 否
   */
  public static boolean isConnected(Context context) {
    NetworkInfo info = getActiveNetworkInfo(context);
    return info != null && info.isConnected();
  }

  /**
   * 判断网络是否是4G
   * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
   *
   * @param context 上下文
   * @return {@code true}: 是<br>{@code false}: 不是
   */
  public static boolean is4G(Context context) {
    NetworkInfo info = getActiveNetworkInfo(context);
    return info != null && info.isAvailable() && info.getSubtype() == TelephonyManager.NETWORK_TYPE_LTE;
  }

  /**
   * 判断wifi是否连接状态
   * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
   *
   * @param context 上下文
   * @return {@code true}: 连接<br>{@code false}: 未连接
   */
  public static boolean isWifiConnected(Context context) {
    ConnectivityManager cm = (ConnectivityManager) context
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    return cm != null && cm.getActiveNetworkInfo() != null
        && cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
  }

  /**
   * 获取移动网络运营商名称
   * <p>如中国联通、中国移动、中国电信</p>
   *
   * @param context 上下文
   * @return 移动网络运营商名称
   */
  public static String getNetworkOperatorName(Context context) {
    TelephonyManager tm = (TelephonyManager) context
        .getSystemService(Context.TELEPHONY_SERVICE);
    return tm != null ? tm.getNetworkOperatorName() : null;
  }

  /**
   * 获取移动终端类型
   *
   * @param context 上下文
   * @return 手机制式
   * <ul>
   * <li>{@link TelephonyManager#PHONE_TYPE_NONE } : 0 手机制式未知</li>
   * <li>{@link TelephonyManager#PHONE_TYPE_GSM } : 1 手机制式为GSM，移动和联通</li>
   * <li>{@link TelephonyManager#PHONE_TYPE_CDMA } : 2 手机制式为CDMA，电信</li>
   * <li>{@link TelephonyManager#PHONE_TYPE_SIP } : 3</li>
   * </ul>
   */
  public static int getPhoneType(Context context) {
    TelephonyManager tm = (TelephonyManager) context
        .getSystemService(Context.TELEPHONY_SERVICE);
    return tm != null ? tm.getPhoneType() : -1;
  }

  /**
   * 获取当前的网络类型(WIFI,2G,3G,4G)
   * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
   *
   * @param context 上下文
   * @return 网络类型
   * <ul>
   * <li>{@link #NETWORK_WIFI  } = 1;</li>
   * <li>{@link #NETWORK_4G   } = 4;</li>
   * <li>{@link #NETWORK_3G   } = 3;</li>
   * <li>{@link #NETWORK_2G   } = 2;</li>
   * <li>{@link #NETWORK_UNKNOWN} = 5;</li>
   * <li>{@link #NETWORK_NO   } = -1;</li>
   * </ul>
   */
  public static int getNetWorkType(Context context) {
    int netType = NETWORK_NO;
    NetworkInfo info = getActiveNetworkInfo(context);
    if (info != null && info.isAvailable()) {

      if (info.getType() == ConnectivityManager.TYPE_WIFI) {
        netType = NETWORK_WIFI;
      } else if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
        switch (info.getSubtype()) {

          case NETWORK_TYPE_GSM:
          case TelephonyManager.NETWORK_TYPE_GPRS:
          case TelephonyManager.NETWORK_TYPE_CDMA:
          case TelephonyManager.NETWORK_TYPE_EDGE:
          case TelephonyManager.NETWORK_TYPE_1xRTT:
          case TelephonyManager.NETWORK_TYPE_IDEN:
            netType = NETWORK_2G;
            break;

          case NETWORK_TYPE_TD_SCDMA:
          case TelephonyManager.NETWORK_TYPE_EVDO_A:
          case TelephonyManager.NETWORK_TYPE_UMTS:
          case TelephonyManager.NETWORK_TYPE_EVDO_0:
          case TelephonyManager.NETWORK_TYPE_HSDPA:
          case TelephonyManager.NETWORK_TYPE_HSUPA:
          case TelephonyManager.NETWORK_TYPE_HSPA:
          case TelephonyManager.NETWORK_TYPE_EVDO_B:
          case TelephonyManager.NETWORK_TYPE_EHRPD:
          case TelephonyManager.NETWORK_TYPE_HSPAP:
            netType = NETWORK_3G;
            break;

          case NETWORK_TYPE_IWLAN:
          case TelephonyManager.NETWORK_TYPE_LTE:
            netType = NETWORK_4G;
            break;
          default:

            String subtypeName = info.getSubtypeName();
            if (subtypeName.equalsIgnoreCase("TD-SCDMA")
                || subtypeName.equalsIgnoreCase("WCDMA")
                || subtypeName.equalsIgnoreCase("CDMA2000")) {
              netType = NETWORK_3G;
            } else {
              netType = NETWORK_UNKNOWN;
            }
            break;
        }
      } else {
        netType = NETWORK_UNKNOWN;
      }
    }
    return netType;
  }

  /**
   * 获取当前的网络类型(WIFI,2G,3G,4G)
   * <p>依赖上面的方法</p>
   *
   * @param context 上下文
   * @return 网络类型名称
   * <ul>
   * <li>NETWORK_WIFI  </li>
   * <li>NETWORK_4G   </li>
   * <li>NETWORK_3G   </li>
   * <li>NETWORK_2G   </li>
   * <li>NETWORK_UNKNOWN</li>
   * <li>NETWORK_NO   </li>
   * </ul>
   */
  public static String getNetWorkTypeName(Context context) {
    switch (getNetWorkType(context)) {
      case NETWORK_WIFI:
        return "NETWORK_WIFI";
      case NETWORK_4G:
        return "NETWORK_4G";
      case NETWORK_3G:
        return "NETWORK_3G";
      case NETWORK_2G:
        return "NETWORK_2G";
      case NETWORK_NO:
        return "NETWORK_NO";
      default:
        return "NETWORK_UNKNOWN";
    }
  }
}