Android网络优先级及更改

Android版本：

Android 4.4.4

涉及内容：

1，网络优先级；2，网络切换；3，界面显示。

解决问题：

1，更改网络优先级：让以太网（eth0）优先级高于WiFi（Wlan0）；2，WiFi切换到以太网异常原因及解决。

一、网络优先级 1、 Android支持的网络类型 Android系统framework层的ConnectivityManager.java文件中定义了支持的所有网络类型：

frameworks\base\core\java\android\net\ConnectivityManager.javapublic static final int TYPE_MOBILE      = 0;public static final int TYPE_WIFI        = 1;public static final int TYPE_MOBILE_MMS  = 2;public static final int TYPE_MOBILE_SUPL = 3;public static final int TYPE_MOBILE_DUN  = 4;public static final int TYPE_MOBILE_HIPRI = 5;public static final int TYPE_WIMAX       = 6;public static final int TYPE_BLUETOOTH   = 7;public static final int TYPE_DUMMY       = 8;public static final int TYPE_ETHERNET    = 9;public static final int TYPE_MOBILE_FOTA = 10;public static final int TYPE_MOBILE_IMS  = 11;public static final int TYPE_MOBILE_CBS  = 12;public static final int TYPE_WIFI_P2P    = 13;

对于上网，接触的几乎都是 TYPE_WIFI、 TYPE_MOBILE、TYPE_ETHERNET这三种。这些网络的优先级定义在config.xml文件的networkAttributes数组中：

frameworks\base\core\res\res\values\config.xml"wifi,1,1,1,-1,true""mobile,0,0,0,-1,true""mobile_mms,2,0,2,60000,true""mobile_supl,3,0,2,60000,true""mobile_hipri,5,0,3,60000,true""mobile_fota,10,0,2,60000,true""mobile_ims,11,0,2,60000,true""mobile_cbs,12,0,2,60000,true""wifi_p2p,13,1,0,-1,true""mobile_ia,14,0,2,-1,true""bluetooth,7,7,1,60000,true""eth,9,9,4,60000,true"

注意 networkAttributes数组前的注释！大意是说，对某种网络支持与否取决与硬件，所以该文件会被源码目录/device/下的config.xml定义的 networkAttributes数组覆盖！！！也就是说，真正起作用的优先级配置在 源码目录/device/ 下的config.xml中定义。
对于 networkAttributes数组的每一个item：

"wifi,1,1,1,-1,true"

其含义由 NetworkConfig.java描述（一一对应）：

frameworks\base\core\java\android\net\NetworkConfig.javapublic class NetworkConfig {    /**     * Human readable string     */    public String name;    /**     * Type from ConnectivityManager     */    public int type;    /**     * the radio number from radio attributes config     */    public int radio;    /**     * higher number == higher priority when turning off connections     */    public int priority;    /**     * indicates the boot time dependencyMet setting     */    public boolean dependencyMet;    /**     * indicates the default restoral timer in seconds     * if the network is used as a special network feature     * -1 indicates no restoration of default     */    public int restoreTime;    /**     * input string from config.xml resource.  Uses the form:     * [Connection name],[ConnectivityManager connection type],     * [associated radio-type],[priority],[dependencyMet]     */    public NetworkConfig(String init) {        String fragments[] = init.split(",");        name = fragments[0].trim().toLowerCase(Locale.ROOT);        type = Integer.parseInt(fragments[1]);        radio = Integer.parseInt(fragments[2]);        priority = Integer.parseInt(fragments[3]);        restoreTime = Integer.parseInt(fragments[4]);        dependencyMet = Boolean.parseBoolean(fragments[5]);    }}

2、更改以太网优先级高于WiFi

"eth,9,9,0,60000,true"

并设置 Preferred网络为以太网：

frameworks\base\services\java\com\android\server\ConnectivityService.javamNetworkPreference = getPersistedNetworkPreference();private int getPersistedNetworkPreference() {final ContentResolver cr = mContext.getContentResolver();// 设置Preferred网络为TYPE_ETHERNETSettings.Global.putInt(cr, Settings.Global.NETWORK_PREFERENCE, ConnectivityManager.TYPE_ETHERNET);final int networkPrefSetting = Settings.Global.getInt(cr, Settings.Global.NETWORK_PREFERENCE, -1);log("networkPrefSetting: " + networkPrefSetting);if (networkPrefSetting != -1) {return networkPrefSetting;}return ConnectivityManager.DEFAULT_NETWORK_PREFERENCE;}

3、网络优先级的读取

frameworks\base\services\java\com\android\server\ConnectivityService.javapublic ConnectivityService() {if (DBG) log("ConnectivityService starting up");boolean wifiOnly = SystemProperties.getBoolean("ro.radio.noril", false);log("wifiOnly=" + wifiOnly);String[] naStrings = context.getResources().getStringArray(com.android.internal.R.array.networkAttributes);for (String naString : naStrings) {try {NetworkConfig n = new NetworkConfig(naString);if (VDBG) log("naString=" + naString + " config=" + n);mNetConfigs[n.type] = n;mNetworksDefined++;}}}

Log如下：

二、网络切换现在，优先级：Ethernet > WiFi，在WiFi连接的情况下，点击【使用以太网】按钮进行网络切换：先响应一个EVENT_CONFIGURATION_CHANGED事件：

frameworks\base\services\java\com\android\server\ConnectivityService.javacase NetworkStateTracker.EVENT_CONFIGURATION_CHANGED: {info = (NetworkInfo) msg.obj;handleConnectivityChange(info.getType(), false);break;}

对网络是否切换的仲裁在 handleConnect（）方法中调用的 isNewNetTypePreferredOverCurrentNetType（）方法：

frameworks\base\services\java\com\android\server\ConnectivityService.javaprivate void handleConnect(NetworkInfo info) {final int newNetType = info.getType();if (VDBG) {log("handleConnect: E newNetType=" + newNetType + " thisIface=" + thisIface+ " isFailover" + isFailover);}// if this is a default net and other default is running// kill the one not preferredif (mNetConfigs[newNetType].isDefault()) {if (mActiveDefaultNetwork != -1 && mActiveDefaultNetwork != newNetType) {if (isNewNetTypePreferredOverCurrentNetType(newNetType)) {// tear down the otherNetworkStateTracker otherNet =mNetTrackers[mActiveDefaultNetwork];if (DBG) {log("Policy requires " + otherNet.getNetworkInfo().getTypeName() +" teardown");}if (!teardown(otherNet)) {loge("Network declined teardown request");teardown(thisNet);return;}} else {   // don't accept this oneif (VDBG) {log("Not broadcasting CONNECT_ACTION " +"to torn down network " + info.getTypeName());}teardown(thisNet);return;}}}}private boolean isNewNetTypePreferredOverCurrentNetType(int type) {log("type = "+ type);log("mNetworkPreference = " + mNetworkPreference);log("mActiveDefaultNetwork = " + mActiveDefaultNetwork);log("mNetConfigs[mActiveDefaultNetwork].priority = " + mNetConfigs[mActiveDefaultNetwork].priority);log("mNetConfigs[type].priority = " + mNetConfigs[type].priority);if (((type != mNetworkPreference)  && (mNetConfigs[mActiveDefaultNetwork].priority > mNetConfigs[type].priority))   || (mNetworkPreference == mActiveDefaultNetwork)) {log("return false");return false;}log("return true");return true;}

mNetworkPreference = 9，之前设置的Preferred网络。 mActiveDefaultNetwork = 1，当前使用的网络，即WiFi。经过 isNewNetTypePreferredOverCurrentNetType()的仲裁，返回true进行网络切换：

Policy requires WIFI teardown

至此， Ethernet当道，WiFi让行。
三、界面显示在【Settings-->以太网】界面，【使用以太网】选项一直处于连接状态且不可点击，IP地址等信息亦不见；此时进入Shell用ifconfig查看IP，可知以太网IP等已经获取、且WiFi已经断掉、且ping网络正常。原因去在Settings部分查找：

packages\apps\settings\src\com\android\settings\ethernet\EthernetSettings.javapublic void getEthInfo(int state){if (state == EthernetDataTracker.ETHER_STATE_CONNECTING) {mUseEthernet.setEnabled(false);mUseEthernet.setSummary(R.string.ethernet_connecting);clearIpInfo();} else if (state == EthernetDataTracker.ETHER_STATE_DISCONNECTED) {mUseEthernet.setEnabled(true);mUseEthernet.setSummary(R.string.ethernet_unconnected);clearIpInfo();} else if (state == EthernetDataTracker.ETHER_STATE_CONNECTED) {mUseEthernet.setEnabled(true);mUseEthernet.setSummary(R.string.ethernet_connected);if(isUsingStaticIp()) {getEthInfoFromStaticIP();} else {getEthInfoFromDhcp();}mEthmac = getEthMac();}}

mUseEthernet不可用原因是以太网一直处于 ETHER_STATE_CONNECTING 状态，以太网状态来自：

packages\apps\settings\src\com\android\settings\ethernet\EthernetSettings.javaprivate final BroadcastReceiver mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {int state = intent.getIntExtra(EthernetDataTracker.EXTRA_ETHERNET_STATE, 0);Log.d(TAG, "BroadcastReceiver: Ethernet current state:" + state);getEthInfo(state);}};

广播发送地：

frameworks\base\core\java\android\net\EthernetDataTracker.javaprivate void runDhcp() {Log.d(TAG, "mIface = " + mIface + ", isEthernetEnabled() = " + isEthernetEnabled());if(!mIface.isEmpty() && isEthernetEnabled()) {registerEthernetContentObserver(); // register here when boot with plugged ethernet{// send connected msg only when wifi disconnectif(!IsWiFiConnected()) {sendEthStateChangedBroadcast(ETHER_STATE_CONNECTED);} else {Log.e(TAG, "WiFiConnected, cannot send ETHER_STATE_CONNECTED MSG");}}}}private Boolean IsWiFiConnected() {try {ConnectivityManager cm = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);boolean isWiFiConnected = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnected();Log.e(TAG, "isWiFiConnected: " + isWiFiConnected);return isWiFiConnected;}}

可知：虽然 WiFi已经被teardown，但IsWiFiConnected()依旧返回true，即WiFi状态没被更新:

frameworks\base\wifi\java\android\net\wifi\WifiStateTracker.javapublic boolean teardown() {mTeardownRequested.set(true);mWifiManager.stopWifi();return true;}

IsWiFiConnected()运行先于WiFi的teardown()，所以在teardown()更改WiFi的状态是无效的。。。既然现在需要Ethernet优先级高于WiFi，直接让IsWiFiConnected()返回false即可。

Android 6.0 Wifi/Ethernet同时开默认动作：
先连接WiFi，再开ethernet，WiFi会被系统自动的关掉：状态由connected->saved，log：

03-15 01:18:44.204   556   574 D Tethering: interfaceLinkStateChanged wlan0, true03-15 01:18:44.205   556   574 D Tethering: interfaceStatusChanged wlan0, true03-15 01:18:47.585   556   574 D Tethering: interfaceLinkStateChanged eth0, true03-15 01:18:47.585   556   574 D Tethering: interfaceStatusChanged eth0, true03-15 01:18:47.591   556   574 D EthernetNetworkFactory: updateInterface: eth0 link up03-15 01:18:47.596   556  1806 I EthernetNetworkFactory: dhcpThread(eth0): mNetworkInfo=[type: Ethernet[], state: DISCONNECTED/DISCONNECTED, reason: (unspecified), extra: 00:23:9e:03:bd:aa, roaming: false, failover: false, isAvailable: true]03-15 01:18:47.632  1807  1807 I dhcpcd  : version 5.5.6 starting03-15 01:18:47.633  1807  1807 E dhcpcd  : get_duid: Read-only file system03-15 01:18:47.738  1807  1807 I dhcpcd  : eth0: rebinding lease of 192.168.1.6403-15 01:18:47.895  1807  1807 I dhcpcd  : eth0: acknowledged 192.168.1.64 from 192.168.1.25003-15 01:18:47.942  1807  1807 I dhcpcd  : eth0: leased 192.168.1.64 for 86400 seconds03-15 01:18:48.430   556  1806 D ConnectivityService: registerNetworkAgent NetworkAgentInfo{ ni{[type: Ethernet[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: 00:23:9e:03:bd:aa, roaming: false, failover: false, isAvailable: true]}  network{116}  lp{{InterfaceName: eth0 LinkAddresses: [192.168.1.64/22,]  Routes: [192.168.0.0/22 -> 0.0.0.0 eth0,0.0.0.0/0 -> 192.168.1.250 eth0,] DnsAddresses: [192.168.1.250,] Domains:  MTU: 0 TcpBufferSizes: 524288,1048576,3145728,524288,1048576,2097152}}  nc{[ Transports: ETHERNET Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN LinkUpBandwidth>=100000Kbps LinkDnBandwidth>=100000Kbps]}  Score{110}  everValidated{false}  lastValidated{false}  created{false} lingering{false} explicitlySelected{false} acceptUnvalidated{false} everCaptivePortalDetected{false} lastCaptivePortalDetected{false} }03-15 01:18:48.432   556   634 D ConnectivityService: NetworkAgentInfo [Ethernet () - 116] EVENT_NETWORK_INFO_CHANGED, going from null to CONNECTED03-15 01:18:48.442   556   634 D ConnectivityService: Adding iface eth0 to network 11603-15 01:18:48.496   556   634 E ConnectivityService: Unexpected mtu value: 0, eth003-15 01:18:48.496   556   634 D ConnectivityService: Adding Route [192.168.0.0/22 -> 0.0.0.0 eth0] to network 11603-15 01:18:48.501   556   634 D ConnectivityService: Adding Route [0.0.0.0/0 -> 192.168.1.250 eth0] to network 11603-15 01:18:48.506   556   634 D ConnectivityService: Setting Dns servers for network 116 to [/192.168.1.250]03-15 01:18:48.532   556   634 D ConnectivityService: notifyType IP_CHANGED for NetworkAgentInfo [Ethernet () - 116]03-15 01:18:48.550   556   634 D ConnectivityService: scheduleUnvalidatedPrompt 11603-15 01:18:48.550   556   634 D ConnectivityService: updateSignalStrengthThresholds: CONNECT, sending [] to NetworkAgentInfo [Ethernet () - 116]03-15 01:18:48.551   556   634 D ConnectivityService: rematch for NetworkAgentInfo [Ethernet () - 116]03-15 01:18:48.551   556   634 D ConnectivityService:    accepting network in place of NetworkAgentInfo [WIFI () - 115]03-15 01:18:48.552   556   634 D ConnectivityService: notifyType LOSING for NetworkAgentInfo [WIFI () - 115]03-15 01:18:48.552   556  1797 D NetworkMonitor/NetworkAgentInfo [WIFI () - 115]: Lingering03-15 01:18:48.559   556   634 D ConnectivityService: Switching to new default network: NetworkAgentInfo{ ni{[type: Ethernet[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: 00:23:9e:03:bd:aa, roaming: false, failover: false, isAvailable: true]}  network{116}  lp{{InterfaceName: eth0 LinkAddresses: [192.168.1.64/22,]  Routes: [192.168.0.0/22 -> 0.0.0.0 eth0,0.0.0.0/0 -> 192.168.1.250 eth0,] DnsAddresses: [192.168.1.250,] Domains:  MTU: 0 TcpBufferSizes: 524288,1048576,3145728,524288,1048576,2097152}}  nc{[ Transports: ETHERNET Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN LinkUpBandwidth>=100000Kbps LinkDnBandwidth>=100000Kbps]}  Score{110}  everValidated{false}  lastValidated{false}  created{true} lingering{false} explicitlySelected{false} acceptUnvalidated{false} everCaptivePortalDetected{false} lastCaptivePortalDetected{false} }03-15 01:18:48.562   556   634 D ConnectivityService: Setting tx/rx TCP buffers to 524288,1048576,3145728,524288,1048576,209715203-15 01:18:48.572   556   634 D CSLegacyTypeTracker: Sending DISCONNECTED broadcast for type 1 NetworkAgentInfo [WIFI () - 115] isDefaultNetwork=true03-15 01:18:48.572   556   634 D ConnectivityService: sendStickyBroadcast: action=android.net.conn.CONNECTIVITY_CHANGE03-15 01:18:48.574   556   634 D CSLegacyTypeTracker: Sending CONNECTED broadcast for type 9 NetworkAgentInfo [Ethernet () - 116] isDefaultNetwork=true03-15 01:18:48.574   556   634 D ConnectivityService: sendStickyBroadcast: action=android.net.conn.CONNECTIVITY_CHANGE03-15 01:18:48.574   556   556 D Tethering: Tethering got CONNECTIVITY_ACTION03-15 01:18:48.575   556   577 D Tethering: MasterInitialState.processMessage what=303-15 01:18:48.582   556   634 D ConnectivityService: notifyType PRECHECK for NetworkAgentInfo [Ethernet () - 116]03-15 01:18:48.582   556   556 D Tethering: Tethering got CONNECTIVITY_ACTION03-15 01:18:48.583   556   577 D Tethering: MasterInitialState.processMessage what=303-15 01:18:48.588   556   634 D ConnectivityService: setProvNotificationVisibleIntent null visible=false networkType=MOBILE extraInfo=null highPriority=false03-15 01:18:48.589   556   634 D ConnectivityService: NetworkAgentInfo [Ethernet () - 116] validation  passed03-15 01:18:48.589   556   634 D ConnectivityService: notifyType CAP_CHANGED for NetworkAgentInfo [Ethernet () - 116]03-15 01:18:48.600   556   634 D ConnectivityService: sendStickyBroadcast: action=android.net.conn.INET_CONDITION_ACTION03-15 01:18:55.216   556   574 D Tethering: interfaceLinkStateChanged wlan0, true03-15 01:18:55.216   556   574 D Tethering: interfaceStatusChanged wlan0, true03-15 01:18:56.558   556   634 D ConnectivityService: handlePromptUnvalidated 11603-15 01:19:13.857   556   632 D WifiStateMachine: starting scan for "360wifi-2"WPA_PSK with 244703-15 01:19:14.556   556   574 D Tethering: interfaceLinkStateChanged wlan0, true03-15 01:19:14.557   556   574 D Tethering: interfaceStatusChanged wlan0, true03-15 01:19:18.565   556   634 D ConnectivityService: handleLingerComplete for NetworkAgentInfo [WIFI () - 115]03-15 01:19:18.566   556   632 D WifiNetworkAgent: NetworkAgent: NetworkAgent channel lost03-15 01:19:18.567   556   634 D ConnectivityService: NetworkAgentInfo [WIFI () - 115] got DISCONNECTED, was satisfying 103-15 01:19:18.595   556   632 E WifiConfigStore: handleBadNetworkDisconnectReport (+8) 0 SSID: 360wifi-2, BSSID: f0:79:59:35:f0:5e, MAC: 58:63:56:f6:f2:ff, Supplicant state: COMPLETED, RSSI: -49, Link speed: 72Mbps, Frequency: 2447MHz, Net ID: 0, Metered hint: false, score: 6003-15 01:19:18.608  1465  1465 I wpa_supplicant: wlan0: CTRL-EVENT-DISCONNECTED bssid=f0:79:59:35:f0:5e reason=3 locally_generated=103-15 01:19:18.612   556   574 D Tethering: interfaceLinkStateChanged wlan0, false03-15 01:19:18.612   556   574 D Tethering: interfaceStatusChanged wlan0, false03-15 01:19:18.613   556   577 D Tethering: InitialState.processMessage what=403-15 01:19:18.617   556   577 D Tethering: sendTetherStateChangedBroadcast 0, 0, 003-15 01:19:18.618   556   574 D Tethering: interfaceLinkStateChanged wlan0, false03-15 01:19:18.618   556   574 D Tethering: interfaceStatusChanged wlan0, false03-15 01:19:18.622   556   634 D ConnectivityService: notifyType LOST for NetworkAgentInfo [WIFI () - 115]03-15 01:19:18.623   556   632 D WifiStateMachine: WifiStateMachine: Leaving Connected state03-15 01:19:18.623   556   632 D WifiNative-HAL: stopRssiMonitoring, cmdId 003-15 01:19:18.623   556   632 E WifiConfigStore: saveWifiConfigBSSID Setting BSSID for "360wifi-2"WPA_PSK to any03-15 01:19:18.638   556  1468 D DhcpClient: Clearing IP address03-15 01:19:18.698   229   551 E Netd    : netlink response contains error (No such file or directory)03-15 01:19:18.699   229   551 D CommandListener: Clearing all IP addresses on wlan003-15 01:19:18.700   229   551 D CommandListener: Setting iface cfg03-15 01:19:18.703   556  1798 D DhcpClient: Receive thread stopped03-15 01:19:18.711   556   632 E WifiConfigStore: saveWifiConfigBSSID Setting BSSID for "360wifi-2"WPA_PSK to any03-15 01:19:18.723   556   632 D WifiStateMachine: Start Disconnecting Watchdog 1303-15 01:19:18.732   556   632 D WifiNative-HAL: stopRssiMonitoring, cmdId 003-15 01:19:18.735   229   551 D CommandListener: Clearing all IP addresses on wlan003-15 01:19:18.847   556   632 D WifiConfigStore: Retrieve network priorities after PNO.03-15 01:19:20.174   556   574 D Tethering: interfaceLinkStateChanged wlan0, false03-15 01:19:20.174   556   574 D Tethering: interfaceStatusChanged wlan0, false03-15 01:19:20.260   556   632 E WifiConfigStore:  rewrite network history for "360wifi-2"WPA_PSK

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