Android 判断用户2G/3G/4G移动数据网络
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
有朋友说他是移动 4G 的网络，获取到的是 17。于是我又去翻了一下源码，找到了如下的代码。也就是说当有新的类型被支持的时候，Android 会增加对于的类型代码。确实 17 是 NETWORKTYPETD_SCDMA 也就是移动的那一坨。其他的代码就不贴了，大概就是这个意思。下面的代码是5.1的代码。
/** 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;
/** Current network is GSM {@hide} */
public static final int NETWORK_TYPE_GSM = 16;
/** Current network is TD_SCDMA {@hide} */
public static final int NETWORK_TYPE_TD_SCDMA = 17;
/** Current network is IWLAN {@hide} */
public static final int NETWORK_TYPE_IWLAN = 18;
示例：
////////
/*
* 前边注释和后边注释是后来加的判断网络类型
*/
//WIFI("wifi", 1), G2("2G", 2), G3("3G", 3), WAP("wap", 4), NO("invalid", 5), ALL(
//"all", 6), G4("4G",7);
private static final int NETWORK_TYPE_UNAVAILABLE = 5;
// private static final int NETWORK_TYPE_MOBILE = -100;
private static final int NETWORK_TYPE_WIFI = 1;
private static final int NETWORK_CLASS_WIFI = 1;
private static final int NETWORK_CLASS_UNAVAILABLE = 5;
/** Unknown network class. */
private static final int NETWORK_CLASS_UNKNOWN = 6;
/** Class of broadly defined "2G" networks. */
private static final int NETWORK_CLASS_2_G = 2;
/** Class of broadly defined "3G" networks. */
private static final int NETWORK_CLASS_3_G = 3;
/** Class of broadly defined "4G" networks. */
private static final int NETWORK_CLASS_4_G = 7;
/**
* 获取网络类型
*
* @return
*/
public 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 int getNetworkClassByType(int networkType) {
switch (networkType) {
case TelephonyManager.NETWORK_TYPE_GPRS:
case TelephonyManager.NETWORK_TYPE_EDGE:
case TelephonyManager.NETWORK_TYPE_CDMA:
case TelephonyManager.NETWORK_TYPE_1xRTT:
case TelephonyManager.NETWORK_TYPE_IDEN:
return NETWORK_CLASS_2_G;
case TelephonyManager.NETWORK_TYPE_UMTS:
case TelephonyManager.NETWORK_TYPE_EVDO_0:
case TelephonyManager.NETWORK_TYPE_EVDO_A:
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:
return NETWORK_CLASS_3_G;
case TelephonyManager.NETWORK_TYPE_LTE:
return NETWORK_CLASS_4_G;
default:
return NETWORK_CLASS_UNKNOWN;
}
}
private int getNetworkClass() {
connectivityManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null&& networkInfo.isConnected()) {
int type = networkInfo.getType();
if (type == ConnectivityManager.TYPE_WIFI) {
mNetWorkType = NetEnum.WIFI.getID();
} else if (type == ConnectivityManager.TYPE_MOBILE) {
TelephonyManager telephonyManager = (TelephonyManager) this.getSystemService(
Context.TELEPHONY_SERVICE);
mNetWorkType = getNetworkClassByType(telephonyManager.getNetworkType());
}
} else {
mNetWorkType = NETWORK_TYPE_UNAVAILABLE;
}
return mNetWorkType;
}
////
参考博客：http://blog.binkery.com/android/networks_type.html
http://www.eoeandroid.com/thread-540327-1-1.html?_dsign=77a59737
最近在项目中用到啦，总结了下。。。。大部分都是别人总结好的，就直接拿过来啦，哈哈。。