Android13 实现有线网络和wifi共存

一、前言

Android一些的定制设备，比如商显大屏或者Android盒子，一般是wifi或者有线网络。
Android 系统Framework进行一定适配后，可以实现wifi和有线网络端口都打开的，
进而在App端即可实现通过代码控制选择使用wifi或者有线网络进行网络请求。

Android11 上Wifi和有线网共存，已经有介绍：
https://blog.csdn.net/wenzhi20102321/article/details/133913924

Android13 上代码有较大差别，这里也进行记录和介绍。

二、修改代码：

Android13下面两个代码都要修改，不然会有点bug！

1、ConnectivityService.java

packages\modules\Connectivity\service\src\com\android\server\ConnectivityService.java

    private void teardownUnneededNetwork(NetworkAgentInfo nai) {if (nai.numRequestNetworkRequests() != 0) {for (int i = 0; i < nai.numNetworkRequests(); i++) {NetworkRequest nr = nai.requestAt(i);// Ignore listening and track default requests.if (!nr.isRequest()) continue;loge("Dead network still had at least " + nr);break;}}loge("no to disconnect! ");//mychange//nai.disconnect();}

ConnectivityService.java 里面还有一个地方，有调用 nai.disconnect()，最后也注释掉。

2、NetworkFactoryImpl.java

frameworks\libs\net\common\device\android\net\NetworkFactoryImpl.java

    private void handleRemoveRequest(NetworkRequest request) {NetworkRequestInfo n = mNetworkRequests.get(request);mParent.log("  handleRemoveRequest  no do !"); //mychangeif (n != null) {//mNetworkRequests.remove(request);//if (n.requested) mParent.releaseNetworkFor(n.request);}}

最好是添加一个prop属性，记忆是否释放网络，方便手动修改和调试，类似下面的代码：

import android.os.SystemProperties;boolean isReleaseNetwork = SystemProperties.getBoolean("persist.demo.release_network", false);Log.e(TAG, "disconnect isReleaseNetwork = " + isReleaseNetwork);if (!isReleaseNetwork) {return;}

两个地方都加上属性判断

3、Android11 和Android13 修改代码目录对比：

文件修改目录：

//Android11
frameworks\base\services\core\java\com\android\server\ConnectivityService.java
frameworks\libs\net\common\src_servicescommon\android\net\NetworkFactory.java//Android13
packages\modules\Connectivity\service\src\com\android\server\ConnectivityService.java
frameworks\libs\net\common\device\android\net\NetworkFactoryImpl.java

可以看到里面的代码目录完全不一样的；
并且里面的代码实现也是有非常大的差异！有兴趣的可以自己研究看看。

4、如果只修改部分代码的后果

这里只说Android13 是上的，Android11 的比较久没动了，记不清了！

只修改 ConnectivityService.java，不修改 NetworkFactoryImpl.java 的情况

刚开始是可以同时连接上的，但是你发现断开后，无法再连接上wifi！
因为相关请求已经被移除了，低优先级的网络无法再重新连接！
具体为啥无法再连接，没有进一步具体分析，有兴趣的可以去看看。

只修改 NetworkFactoryImpl.java，不修改 ConnectivityService.java 的情况

Wifi和有线网是可以同时连接的，但是Wifi会每过几秒就会断开重连！

从日志看有 ConnectivityService 和 NetworkAgent 的相关日志

10-18 15:18:49.999   636   802 D ConnectivityService: handleLingerComplete for [143 WIFI]
10-18 15:18:50.000   636   794 D WifiNetworkAgent: NetworkAgent: NetworkAgent channel lost //网络断开的关键
10-18 15:18:50.000   636   802 D ConnectivityService: [143 WIFI] disconnected, was satisfying 10

每几秒重复一次上面的日志

如果你在 ConnectivityService.teardownUnneededNetwork 方法添加日志，发现会执行到 nai.disconnect();

所以循环断开是系统流程里面导致的。具体哪里开始的，可以基于日志分析，这里不展开介绍。

三、网络共存验证

1、窗口命令查看

（1）ifconfig

图片：

内容：

console:/ # 
console:/ # ifconfig
lo        Link encap:Local Loopback  inet addr:127.0.0.1  Mask:255.0.0.0 inet6 addr: ::1/128 Scope: HostUP LOOPBACK RUNNING  MTU:65536  Metric:1RX packets:33 errors:0 dropped:0 overruns:0 frame:0 TX packets:33 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2898 TX bytes:2898 eth0      Link encap:Ethernet  HWaddr 42:6b:39:d7:49:75  Driver rk_gmac-dwmacinet addr:192.168.31.174  Bcast:192.168.31.255  Mask:255.255.255.0 inet6 addr: fe80::42ff:4f65:13fe:20fa/64 Scope: LinkUP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1RX packets:558 errors:0 dropped:0 overruns:0 frame:0 TX packets:135 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:40961 TX bytes:20403 Interrupt:78 wlan0     Link encap:Ethernet  HWaddr 0c:cf:89:a6:44:2a  Driver usbinet addr:192.5.1.34  Bcast:192.5.1.255  Mask:255.255.255.0 inet6 addr: fe80::2e43:706c:c30b:f9c8/64 Scope: LinkUP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1RX packets:812 errors:0 dropped:0 overruns:0 frame:0 TX packets:95 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3000 RX bytes:142061 TX bytes:17362 console:/ # 

可以看到 wlan0 和 eth0 都是存在ip地址的。

（2）ping -I 节点名称 ip/url

测试通过节点对应的网络访问某个ip

130|console:/ # 
130|console:/ # ping wwwbaidu.com
PING wwwbaidu.com (45.194.224.35) 56(84) bytes of data.
64 bytes from 45.194.224.35: icmp_seq=1 ttl=43 time=13.6 ms
64 bytes from 45.194.224.35: icmp_seq=2 ttl=43 time=13.4 ms
64 bytes from 45.194.224.35: icmp_seq=3 ttl=43 time=38.7 ms
64 bytes from 45.194.224.35: icmp_seq=4 ttl=43 time=13.5 ms
^C
--- wwwbaidu.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 13.452/19.851/38.744/10.908 ms
console:/ # 
console:/ # 
console:/ # ping -I eth0 www.baidu.com
PING www.a.shifen.com (157.148.69.80) from 192.168.31.174 eth0: 56(84) bytes of data.
64 bytes from 157.148.69.80: icmp_seq=1 ttl=46 time=15.0 ms
64 bytes from 157.148.69.80: icmp_seq=2 ttl=46 time=14.5 ms
64 bytes from 157.148.69.80: icmp_seq=3 ttl=46 time=15.2 ms
64 bytes from 157.148.69.80: icmp_seq=4 ttl=46 time=14.6 ms
^C
--- www.a.shifen.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 14.580/14.877/15.257/0.294 ms
console:/ # 
console:/ # ping -I wlan0 www.baidu.com
PING www.a.shifen.com (157.148.69.80) from 192.5.1.34 wlan0: 56(84) bytes of data.
64 bytes from 157.148.69.80: icmp_seq=1 ttl=41 time=478 ms
64 bytes from 157.148.69.80: icmp_seq=2 ttl=41 time=99.9 ms
64 bytes from 157.148.69.80: icmp_seq=3 ttl=41 time=89.0 ms
64 bytes from 157.148.69.80: icmp_seq=4 ttl=41 time=96.1 ms
^C
--- www.a.shifen.com ping statistics ---
5 packets transmitted, 4 received, 20% packet loss, time 4005ms
rtt min/avg/max/mdev = 89.084/191.015/478.886/166.248 ms
console:/ # 

这里可以看到有线网和wifi都是对外正常进行通讯的。

（3）dumpsys connectivity

这里会有比较多的连接信息，主要信息如下：

console:/ # 
console:/ # 
console:/ # dumpsys connectivityCurrent Networks:
//wifi 相关信息NetworkAgentInfo{network{100}  handle{432902426637}  ni{WIFI CONNECTED extra: } Score(60 ; KeepConnected : 0 ; Policies : TRANSPORT_PRIMARY&EVER_VALIDATED_NOT_AVOIDED_WHEN_BAD&IS_UNMETERED&IS_VALIDATED)  created everValidated lastValidated  lp{{InterfaceName: wlan0 LinkAddresses: [ fe80::2e43:706c:c30b:f9c8/64,192.5.1.34/24 ] DnsAddresses: [ /192.5.1.1 ] Domains: null MTU: 0 ServerAddress: /192.5.1.1 TcpBufferSizes: 524288,1048576,2097152,262144,524288,1048576 Routes: [ fe80::/64 -> :: wlan0 mtu 0,192.5.1.0/24 -> 0.0.0.0 wlan0 mtu 0,0.0.0.0/0 -> 192.5.1.1 wlan0 mtu 0 ]}}  nc{[ Transports: WIFI Capabilities: NOT_METERED&INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN&VALIDATED&NOT_ROAMING&FOREGROUND&NOT_CONGESTED&NOT_SUSPENDED&NOT_VCN_MANAGED LinkUpBandwidth>=12000Kbps LinkDnBandwidth>=30000Kbps Specifier: <WifiNetworkAgentSpecifier [WifiConfiguration=, SSID="VPN", BSSID=34:f7:16:92:87:6c, band=1, mMatchLocalOnlySpecifiers=false]> TransportInfo: <SSID: "VPN", BSSID: 34:f7:16:92:87:6c, MAC: 0c:cf:89:a6:44:2a, IP: /192.5.1.34, Security type: 2, Supplicant state: COMPLETED, Wi-Fi standard: 4, RSSI: -51, Link speed: 270Mbps, Tx Link speed: 270Mbps, Max Supported Tx Link speed: 300Mbps, Rx Link speed: -1Mbps, Max Supported Rx Link speed: 300Mbps, Frequency: 2442MHz, Net ID: 0, Metered hint: false, score: 60, isUsable: true, CarrierMerged: false, SubscriptionId: -1, IsPrimary: 1, Trusted: true, Restricted: false, Ephemeral: false, OEM paid: false, OEM private: false, OSU AP: false, FQDN: <none>, Provider friendly name: <none>, Requesting package name: <none>"VPN"wpa2-pskMLO Information: , AP MLD Address: <none>, AP MLO Link Id: <none>, AP MLO Affiliated links: <none>> SignalStrength: -51 OwnerUid: 1000 AdminUids: [1000] SSID: "VPN" UnderlyingNetworks: Null]}  factorySerialNumber=6}Requests: REQUEST:0 LISTEN:9 BACKGROUND_REQUEST:0 total:9NetworkRequest [ LISTEN id=5, [ Capabilities: FOREGROUND RequestorUid: 1000 RequestorPkg: android UnderlyingNetworks: Null] ]Inactivity Timers:Nat464Xlat:<not start>
//有线网相关信息NetworkAgentInfo{network{101}  handle{437197393933}  ni{Ethernet CONNECTED extra: 42:6b:39:d7:49:75} Score(-2147483648 ; KeepConnected : 0 ; Policies : EVER_VALIDATED_NOT_AVOIDED_WHEN_BAD&IS_UNMETERED&IS_VALIDATED)  created everValidated lastValidated  lp{{InterfaceName: eth0 LinkAddresses: [ fe80::42ff:4f65:13fe:20fa/64,192.168.31.174/24 ] DnsAddresses: [ /192.168.31.1 ] Domains: null MTU: 0 ServerAddress: /192.168.31.1 TcpBufferSizes: 524288,1048576,3145728,524288,1048576,2097152 Routes: [ fe80::/64 -> :: eth0 mtu 0,192.168.31.0/24 -> 0.0.0.0 eth0 mtu 0,0.0.0.0/0 -> 192.168.31.1 eth0 mtu 0 ]}}  nc{[ Transports: ETHERNET Capabilities: NOT_METERED&INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN&VALIDATED&NOT_ROAMING&FOREGROUND&NOT_CONGESTED&NOT_SUSPENDED&NOT_VCN_MANAGED LinkUpBandwidth>=100000Kbps LinkDnBandwidth>=100000Kbps Specifier: <EthernetNetworkSpecifier (eth0)> UnderlyingNetworks: Null]}  factorySerialNumber=1}Requests: REQUEST:10 LISTEN:7 BACKGROUND_REQUEST:0 total:17NetworkRequest [ REQUEST id=1, [ Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN&NOT_VCN_MANAGED RequestorUid: 1000 RequestorPkg: android UnderlyingNetworks: Null] ]NetworkRequest [ LISTEN id=5, [ Capabilities: FOREGROUND RequestorUid: 1000 RequestorPkg: android UnderlyingNetworks: Null] ]Inactivity Timers:Nat464Xlat:<not start>

这里可以看到 Wifi 和有线网都要相关信息和不同的ip；
这里和Android11 有个非常不同的是：Android 有线网没有 Score 值？
这里值显示的是int 的最小值。但是还是有线网优先的！
Android11 上是可以看到 Score 的值为 70，代码上明显定义的，Android13 上未定义；
所以如果Android13 上要设置优先级估计就比较麻烦了。
如果确实要做优先级，可以看 NetworkAgentInfo 对象里面的Score 值的定义线索进行分析。

2、代码查看

可以通过代码查看Wifi 和有线网的 Ip地址

//getIpAddress,第二个参数是决定是获取的wifi的ip地址还是有线网的ip地址public static String getIpAddress(Context context, boolean isGetWifiIp) {Network network = null;if (isGetWifiIp) {network = getWlanNet(context);} else {network = getFirstEthernet(context);}if (network == null) {return "";}ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);final LinkProperties linkProperties = mConnectivityManager.getLinkProperties(network);if (linkProperties != null) {for (LinkAddress linkAddress : linkProperties.getLinkAddresses()) {InetAddress inetAddress = linkAddress.getAddress();if (inetAddress instanceof Inet4Address) {return inetAddress.getHostAddress();}}}return "";}//getFirstEthernetprivate static Network getFirstEthernet(Context context) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);final Network[] networks = mConnectivityManager.getAllNetworks();for (final Network network : networks) {NetworkInfo networkInfo = mConnectivityManager.getNetworkInfo(network);if (networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_ETHERNET) {return network;}}return null;}//getFirstWlanprivate static Network getWlanNet(Context context) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);final Network[] networks = mConnectivityManager.getAllNetworks();for (final Network network : networks) {NetworkInfo networkInfo = mConnectivityManager.getNetworkInfo(network);if (networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {return network;}}return null;}

通过上面的代码 getIpAddress 方法，是可以分别获取到Wifi 和有线网的 Ip的！

另外，Java代码情况网络是可以指定特定网络通讯的，这里不展开介绍。

有兴趣的可以看看：
https://blog.csdn.net/wenzhi20102321/article/details/133950336