在做 Android App 的时候，为了给用户省流量，为了不激起用户的愤怒，为了更好的用户体验，是需要根据用户当前网络情况来做一些调整的，也可以在 App 的设置模块里，让用户自己选择，在 2G / 3G / 4G 网络条件下，是否允许请求一些流量比较大的数据。
通过 Android 提供的 TelephonyManager 和 ConnectivityManager 都可以获取到 NetworksInfo 对象，可以通过 getType() 获取类型，判断是 wifi 还是 mobile ，如果是 mobile ，可以通过 NetworksInfo 对象的 getSubType() 和 getSubTypeName() 可以获取到对于的网络类型和名字。
网络类型和名字定义在 TelephonyManager 类里。
/** Network type is unknown */ public static final int NETWORK_TYPE_UNKNOWN = 0; /** Current network is GPRS */ public static final int NETWORK_TYPE_GPRS = 1; /** Current network is EDGE */ public static final int NETWORK_TYPE_EDGE = 2; /** Current network is UMTS */ public static final int NETWORK_TYPE_UMTS = 3; /** Current network is CDMA: Either IS95A or IS95B*/ public static final int NETWORK_TYPE_CDMA = 4; /** Current network is EVDO revision 0*/ public static final int NETWORK_TYPE_EVDO_0 = 5; /** Current network is EVDO revision A*/ public static final int NETWORK_TYPE_EVDO_A = 6; /** Current network is 1xRTT*/ public static final int NETWORK_TYPE_1xRTT = 7; /** Current network is HSDPA */ public static final int NETWORK_TYPE_HSDPA = 8; /** Current network is HSUPA */ public static final int NETWORK_TYPE_HSUPA = 9; /** Current network is HSPA */ public static final int NETWORK_TYPE_HSPA = 10; /** Current network is iDen */ public static final int NETWORK_TYPE_IDEN = 11; /** Current network is EVDO revision B*/ public static final int NETWORK_TYPE_EVDO_B = 12; /** Current network is LTE */ public static final int NETWORK_TYPE_LTE = 13; /** Current network is eHRPD */ public static final int NETWORK_TYPE_EHRPD = 14; /** Current network is HSPA+ */ public static final int NETWORK_TYPE_HSPAP = 15;
看到这个代码和注释，相信没有这方面知识的人很难看懂，都啥玩意？这注释跟没注释有啥区别？！就是让人看着更加闹心而已。所以说，注释对阅读代码的人很重要。当然这些东西可能太专业了，写这些代码的人估计是想写也不知道该怎么了，得写多大一坨啊？！我在最后会贴上一些我整理的资料，可以供大家参考一下，不是很详细，也不专业，就是大概有个印象。
TelephonyManager 还提供了 getNetworkTypeName(int type) 的方法，这个方法可以返回一个字符串，但是信息量不大。
那怎么判断是 2G ， 3G 还是 4G 网络呢？TelephonyManager 还提供了另外一个方法，getNetworkClass(int networkType) ，但这个方法被隐藏掉了，我把代码贴一下。
public static int getNetworkClass(int networkType) { switch (networkType) { case NETWORK_TYPE_GPRS: case NETWORK_TYPE_EDGE: case NETWORK_TYPE_CDMA: case NETWORK_TYPE_1xRTT: case NETWORK_TYPE_IDEN: return NETWORK_CLASS_2_G; case NETWORK_TYPE_UMTS: case NETWORK_TYPE_EVDO_0: case NETWORK_TYPE_EVDO_A: case NETWORK_TYPE_HSDPA: case NETWORK_TYPE_HSUPA: case NETWORK_TYPE_HSPA: case NETWORK_TYPE_EVDO_B: case NETWORK_TYPE_EHRPD: case NETWORK_TYPE_HSPAP: return NETWORK_CLASS_3_G; case NETWORK_TYPE_LTE: return NETWORK_CLASS_4_G; default: return NETWORK_CLASS_UNKNOWN; } }
然后下面是这几个常量的值。
/** Unknown network class. {@hide} */ public static final int NETWORK_CLASS_UNKNOWN = 0; /** Class of broadly defined "2G" networks. {@hide} */ public static final int NETWORK_CLASS_2_G = 1; /** Class of broadly defined "3G" networks. {@hide} */ public static final int NETWORK_CLASS_3_G = 2; /** Class of broadly defined "4G" networks. {@hide} */ public static final int NETWORK_CLASS_4_G = 3;
不知道为啥要把这些东西给隐藏起来，然道是不靠谱？！还是其他的更好的方式？！不知道，先这样吧，现在通过上面的手段，是可以知道用户用的是什么网络，当然也可以区分出来用户使用的是 2G ， 3G 还是 4G 了。当然，你获取到这些数据后，你也可以推算出用户用的是哪家公司的网络，移动的，联通的，还是电信的，当然，只在中国。而且虚拟运营商开始真正上市后，这个就区分不出来是京东的，还是国美，苏宁的了，但是你可以知道你的手机号用的是联通的网还是移动的网。
最后贴上我收集整理的一些资料，可以参考一下。
GPRS 2G(2.5) General Packet Radia Service 114kbps
EDGE 2G(2.75G) Enhanced Data Rate for GSM Evolution 384kbps
UMTS 3G WCDMA 联通3G Universal Mobile Telecommunication System 完整的3G移动通信技术标准
CDMA 2G 电信 Code Division Multiple Access 码分多址
EVDO_0 3G (EVDO 全程 CDMA2000 1xEV-DO) Evolution - Data Only (Data Optimized) 153.6kps - 2.4mbps 属于3G
EVDO_A 3G 1.8mbps - 3.1mbps 属于3G过渡，3.5G
1xRTT 2G CDMA2000 1xRTT (RTT - 无线电传输技术) 144kbps 2G的过渡,
HSDPA 3.5G 高速下行分组接入 3.5G WCDMA High Speed Downlink Packet Access 14.4mbps
HSUPA 3.5G High Speed Uplink Packet Access 高速上行链路分组接入 1.4 - 5.8 mbps
HSPA 3G (分HSDPA,HSUPA) High Speed Packet Access
IDEN 2G Integrated Dispatch Enhanced Networks 集成数字增强型网络 （属于2G，来自维基百科）
EVDO_B 3G EV-DO Rev.B 14.7Mbps 下行 3.5G
LTE 4G Long Term Evolution FDD-LTE 和 TDD-LTE , 3G过渡，升级版 LTE Advanced 才是4G
EHRPD 3G CDMA2000向LTE 4G的中间产物 Evolved High Rate Packet Data HRPD的升级
HSPAP 3G HSPAP 比 HSDPA 快些
实例：
import java.io.BufferedReader; import java.io.InputStreamReader; import java.text.DecimalFormat; import java.util.List; import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.telephony.NeighboringCellInfo; import android.telephony.TelephonyManager; import android.telephony.cdma.CdmaCellLocation; import android.telephony.gsm.GsmCellLocation; import android.util.Log; public class NetWorkUtil { public static boolean isWifiAvailable() { ConnectivityManager connectivityManager = (ConnectivityManager) ConfigManager .getContext().getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); return (networkInfo != null && networkInfo.isConnected() && networkInfo .getType() == ConnectivityManager.TYPE_WIFI); } /** * 获取MAC地址 * * @param context * @return */ public static String getMacAddress(Context context) { if (context == null) { return ""; } String localMac = null; if (isWifiAvailable()) { localMac = getWifiMacAddress(context); } if (localMac != null && localMac.length() > 0) { localMac = localMac.replace(":", "-").toLowerCase(); return localMac; } localMac = getMacFromCallCmd(); if (localMac != null) { localMac = localMac.replace(":", "-").toLowerCase(); } return localMac; } private static String getWifiMacAddress(Context context) { String localMac = null; try { WifiManager wifi = (WifiManager) context .getSystemService(Context.WIFI_SERVICE); WifiInfo info = wifi.getConnectionInfo(); if (wifi.isWifiEnabled()) { localMac = info.getMacAddress(); if (localMac != null) { localMac = localMac.replace(":", "-").toLowerCase(); return localMac; } } } catch (Exception e) { e.printStackTrace(); } return null; } /** * 通过callCmd("busybox ifconfig","HWaddr")获取mac地址 * * @attention 需要设备装有busybox工具 * @return Mac Address */ private static String getMacFromCallCmd() { String result = ""; result = callCmd("busybox ifconfig", "HWaddr"); if (result == null || result.length() <= 0) { return null; } DebugLog.v("tag", "cmd result : " + result); // 对该行数据进行解析 // 例如：eth0 Link encap:Ethernet HWaddr 00:16:E8:3E:DF:67 if (result.length() > 0 && result.contains("HWaddr") == true) { String Mac = result.substring(result.indexOf("HWaddr") + 6, result.length() - 1); if (Mac.length() > 1) { result = Mac.replaceAll(" ", ""); } } return result; } public static String callCmd(String cmd, String filter) { String result = ""; String line = ""; try { Process proc = Runtime.getRuntime().exec(cmd); InputStreamReader is = new InputStreamReader(proc.getInputStream()); BufferedReader br = new BufferedReader(is); // 执行命令cmd，只取结果中含有filter的这一行 while ((line = br.readLine()) != null && line.contains(filter) == false) { } result = line; } catch (Exception e) { e.printStackTrace(); } return result; } /** * 网络是否可用 * * @param context * @return */ public static boolean IsNetWorkEnable(Context context) { try { ConnectivityManager connectivity = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity == null) { ToastUtil.showMessage(context, "无法连接网络"); return false; } NetworkInfo info = connectivity.getActiveNetworkInfo(); if (info != null && info.isConnected()) { // 判断当前网络是否已经连接 if (info.getState() == NetworkInfo.State.CONNECTED) { return true; } } } catch (Exception e) { e.printStackTrace(); } ToastUtil.showMessage(context, "无法连接网络"); return false; } private static final int NETWORK_TYPE_UNAVAILABLE = -1; // private static final int NETWORK_TYPE_MOBILE = -100; private static final int NETWORK_TYPE_WIFI = -101; private static final int NETWORK_CLASS_WIFI = -101; private static final int NETWORK_CLASS_UNAVAILABLE = -1; /** Unknown network class. */ private static final int NETWORK_CLASS_UNKNOWN = 0; /** Class of broadly defined "2G" networks. */ private static final int NETWORK_CLASS_2_G = 1; /** Class of broadly defined "3G" networks. */ private static final int NETWORK_CLASS_3_G = 2; /** Class of broadly defined "4G" networks. */ private static final int NETWORK_CLASS_4_G = 3; private static DecimalFormat df = new DecimalFormat("#.##"); // 适配低版本手机 /** Network type is unknown */ public static final int NETWORK_TYPE_UNKNOWN = 0; /** Current network is GPRS */ public static final int NETWORK_TYPE_GPRS = 1; /** Current network is EDGE */ public static final int NETWORK_TYPE_EDGE = 2; /** Current network is UMTS */ public static final int NETWORK_TYPE_UMTS = 3; /** Current network is CDMA: Either IS95A or IS95B */ public static final int NETWORK_TYPE_CDMA = 4; /** Current network is EVDO revision 0 */ public static final int NETWORK_TYPE_EVDO_0 = 5; /** Current network is EVDO revision A */ public static final int NETWORK_TYPE_EVDO_A = 6; /** Current network is 1xRTT */ public static final int NETWORK_TYPE_1xRTT = 7; /** Current network is HSDPA */ public static final int NETWORK_TYPE_HSDPA = 8; /** Current network is HSUPA */ public static final int NETWORK_TYPE_HSUPA = 9; /** Current network is HSPA */ public static final int NETWORK_TYPE_HSPA = 10; /** Current network is iDen */ public static final int NETWORK_TYPE_IDEN = 11; /** Current network is EVDO revision B */ public static final int NETWORK_TYPE_EVDO_B = 12; /** Current network is LTE */ public static final int NETWORK_TYPE_LTE = 13; /** Current network is eHRPD */ public static final int NETWORK_TYPE_EHRPD = 14; /** Current network is HSPA+ */ public static final int NETWORK_TYPE_HSPAP = 15; /** * 格式化大小 * * @param size * @return */ public static String formatSize(long size) { String unit = "B"; float len = size; if (len > 900) { len /= 1024f; unit = "KB"; } if (len > 900) { len /= 1024f; unit = "MB"; } if (len > 900) { len /= 1024f; unit = "GB"; } if (len > 900) { len /= 1024f; unit = "TB"; } return df.format(len) + unit; } public static String formatSizeBySecond(long size) { String unit = "B"; float len = size; if (len > 900) { len /= 1024f; unit = "KB"; } if (len > 900) { len /= 1024f; unit = "MB"; } if (len > 900) { len /= 1024f; unit = "GB"; } if (len > 900) { len /= 1024f; unit = "TB"; } return df.format(len) + unit + "/s"; } public static String format(long size) { String unit = "B"; float len = size; if (len > 1000) { len /= 1024f; unit = "KB"; if (len > 1000) { len /= 1024f; unit = "MB"; if (len > 1000) { len /= 1024f; unit = "GB"; } } } return df.format(len) + " " + unit + "/s"; } /** * 获取运营商 * * @return */ public static String getProvider() { String provider = "未知"; try { TelephonyManager telephonyManager = (TelephonyManager) ConfigManager .getContext().getSystemService(Context.TELEPHONY_SERVICE); String IMSI = telephonyManager.getSubscriberId(); Log.v("tag", "getProvider.IMSI:" + IMSI); if (IMSI == null) { if (TelephonyManager.SIM_STATE_READY == telephonyManager .getSimState()) { String operator = telephonyManager.getSimOperator(); Log.v("tag", "getProvider.operator:" + operator); if (operator != null) { if (operator.equals("46000") || operator.equals("46002") || operator.equals("46007")) { provider = "中国移动"; } else if (operator.equals("46001")) { provider = "中国联通"; } else if (operator.equals("46003")) { provider = "中国电信"; } } } } else { if (IMSI.startsWith("46000") || IMSI.startsWith("46002") || IMSI.startsWith("46007")) { provider = "中国移动"; } else if (IMSI.startsWith("46001")) { provider = "中国联通"; } else if (IMSI.startsWith("46003")) { provider = "中国电信"; } } } catch (Exception e) { e.printStackTrace(); } return provider; } /** * 获取网络类型 * * @return */ public static String getCurrentNetworkType() { int networkClass = getNetworkClass(); String type = "未知"; switch (networkClass) { case NETWORK_CLASS_UNAVAILABLE: type = "无"; break; case NETWORK_CLASS_WIFI: type = "Wi-Fi"; break; case NETWORK_CLASS_2_G: type = "2G"; break; case NETWORK_CLASS_3_G: type = "3G"; break; case NETWORK_CLASS_4_G: type = "4G"; break; case NETWORK_CLASS_UNKNOWN: type = "未知"; break; } return type; } private static int getNetworkClassByType(int networkType) { switch (networkType) { case NETWORK_TYPE_UNAVAILABLE: return NETWORK_CLASS_UNAVAILABLE; case NETWORK_TYPE_WIFI: return NETWORK_CLASS_WIFI; case NETWORK_TYPE_GPRS: case NETWORK_TYPE_EDGE: case NETWORK_TYPE_CDMA: case NETWORK_TYPE_1xRTT: case NETWORK_TYPE_IDEN: return NETWORK_CLASS_2_G; case NETWORK_TYPE_UMTS: case NETWORK_TYPE_EVDO_0: case NETWORK_TYPE_EVDO_A: case NETWORK_TYPE_HSDPA: case NETWORK_TYPE_HSUPA: case NETWORK_TYPE_HSPA: case NETWORK_TYPE_EVDO_B: case NETWORK_TYPE_EHRPD: case NETWORK_TYPE_HSPAP: return NETWORK_CLASS_3_G; case NETWORK_TYPE_LTE: return NETWORK_CLASS_4_G; default: return NETWORK_CLASS_UNKNOWN; } } private static int getNetworkClass() { int networkType = NETWORK_TYPE_UNKNOWN; try { final NetworkInfo network = ((ConnectivityManager) ConfigManager .getContext() .getSystemService(Context.CONNECTIVITY_SERVICE)) .getActiveNetworkInfo(); if (network != null && network.isAvailable() && network.isConnected()) { int type = network.getType(); if (type == ConnectivityManager.TYPE_WIFI) { networkType = NETWORK_TYPE_WIFI; } else if (type == ConnectivityManager.TYPE_MOBILE) { TelephonyManager telephonyManager = (TelephonyManager) ConfigManager .getContext().getSystemService( Context.TELEPHONY_SERVICE); networkType = telephonyManager.getNetworkType(); } } else { networkType = NETWORK_TYPE_UNAVAILABLE; } } catch (Exception ex) { ex.printStackTrace(); } return getNetworkClassByType(networkType); } public static String getWifiRssi() { int asu = 85; try { final NetworkInfo network = ((ConnectivityManager) ConfigManager .getContext() .getSystemService(Context.CONNECTIVITY_SERVICE)) .getActiveNetworkInfo(); if (network != null && network.isAvailable() && network.isConnected()) { int type = network.getType(); if (type == ConnectivityManager.TYPE_WIFI) { WifiManager wifiManager = (WifiManager) ConfigManager .getContext() .getSystemService(Context.WIFI_SERVICE); WifiInfo wifiInfo = wifiManager.getConnectionInfo(); if (wifiInfo != null) { asu = wifiInfo.getRssi(); } } } } catch (Exception e) { e.printStackTrace(); } return asu + "dBm"; } public static String getWifiSsid() { String ssid = ""; try { final NetworkInfo network = ((ConnectivityManager) ConfigManager .getContext() .getSystemService(Context.CONNECTIVITY_SERVICE)) .getActiveNetworkInfo(); if (network != null && network.isAvailable() && network.isConnected()) { int type = network.getType(); if (type == ConnectivityManager.TYPE_WIFI) { WifiManager wifiManager = (WifiManager) ConfigManager .getContext() .getSystemService(Context.WIFI_SERVICE); WifiInfo wifiInfo = wifiManager.getConnectionInfo(); if (wifiInfo != null) { ssid = wifiInfo.getSSID(); if (ssid == null) { ssid = ""; } ssid = ssid.replaceAll(""", ""); } } } } catch (Exception e) { e.printStackTrace(); } return ssid; } /** * 检查sim卡状态 * * @param ctx * @return */ public static boolean checkSimState() { TelephonyManager tm = (TelephonyManager) ConfigManager.getContext() .getSystemService(Context.TELEPHONY_SERVICE); if (tm.getSimState() == TelephonyManager.SIM_STATE_ABSENT || tm.getSimState() == TelephonyManager.SIM_STATE_UNKNOWN) { return false; } return true; } /** * 获取imei */ public static String getImei() { TelephonyManager mTelephonyMgr = (TelephonyManager) ConfigManager .getContext().getSystemService(Context.TELEPHONY_SERVICE); String imei = mTelephonyMgr.getDeviceId(); if (imei == null) { imei = "000000000000000"; } return imei; } public static String getPhoneImsi() { TelephonyManager mTelephonyMgr = (TelephonyManager) ConfigManager .getContext().getSystemService(Context.TELEPHONY_SERVICE); return mTelephonyMgr.getSubscriberId(); } public static CellInfo getNetInfo() { CellInfo info = new CellInfo(); try { TelephonyManager mTelephonyManager = (TelephonyManager) ConfigManager .getContext().getSystemService(Context.TELEPHONY_SERVICE); String operator = mTelephonyManager.getNetworkOperator(); if (operator != null) { /** 通过operator获取 MCC 和MNC */ if (operator.length() > 3) { String mcc = operator.substring(0, 3); String mnc = operator.substring(3); info.setMcc(mcc); info.setMnc(mnc); } } int lac = 0; int cellId = 0; int phoneType = mTelephonyManager.getPhoneType(); if (phoneType == TelephonyManager.PHONE_TYPE_GSM) { GsmCellLocation location = (GsmCellLocation) mTelephonyManager .getCellLocation(); /** 通过GsmCellLocation获取中国移动和联通 LAC 和cellID */ lac = location.getLac(); cellId = location.getCid(); } else if (phoneType == TelephonyManager.PHONE_TYPE_CDMA) { CdmaCellLocation location = (CdmaCellLocation) mTelephonyManager .getCellLocation(); lac = location.getNetworkId(); cellId = location.getBaseStationId(); cellId /= 16; } if (lac == 0 || cellId == 0) { List<NeighboringCellInfo> infos = mTelephonyManager .getNeighboringCellInfo(); int lc = 0; int ci = 0; int rssi = 0; for (NeighboringCellInfo cell : infos) { // 根据邻区总数进行循环 if (lc == 0 || ci == 0) { lc = cell.getLac(); ci = cell.getCid(); rssi = cell.getRssi(); } // sb.append(" LAC : " + info.getLac()); // // 取出当前邻区的LAC // sb.append(" CID : " + info.getCid()); // // 取出当前邻区的CID // sb.append(" BSSS : " + (-113 + 2 * info.getRssi()) + // " "); // 获取邻区基站信号强度 } rssi = -113 + 2 * rssi; } } catch (Exception e) { e.printStackTrace(); } return info; } }