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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。
Android13下面两个代码都要修改,不然会有点bug!
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。
frameworks\libs\net\common\device\android\net\NetworkFactoryImpl.java
private void handleRemoveRequest(NetworkRequest request) {
NetworkRequestInfo n = mNetworkRequests.get(request);
mParent.log(" handleRemoveRequest no do !"); //mychange
if (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
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。
这里只说Android13 是上的,Android11 的比较久没动了,记不清了!
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。
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。
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: Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX 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-dwmac inet addr:192.168.31.174 Bcast:192.168.31.255 Mask:255.255.255.0 inet6 addr: fe80::42ff:4f65:13fe:20fa/64 Scope: Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX 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 usb inet addr:192.5.1.34 Bcast:192.5.1.255 Mask:255.255.255.0 inet6 addr: fe80::2e43:706c:c30b:f9c8/64 Scope: Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX 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。
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。
这里会有比较多的连接信息,主要信息如下:
console:/ # console:/ # console:/ # dumpsys connectivity Current 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:9 NetworkRequest [ 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:17 NetworkRequest [ 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。
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 ""; } //getFirstEthernet private 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; } //getFirstWlan private 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
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