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";    }  }}