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.java
public 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"
frameworks\base\core\java\android\net\NetworkConfig.java
public 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"
frameworks\base\services\java\com\android\server\ConnectivityService.java
mNetworkPreference = getPersistedNetworkPreference();
private int getPersistedNetworkPreference() {
final ContentResolver cr = mContext.getContentResolver();
// 设置Preferred网络为TYPE_ETHERNET
Settings.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.java
public 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.java
case 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.java
private 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 preferred
if (mNetConfigs[newNetType].isDefault()) {
if (mActiveDefaultNetwork != -1 && mActiveDefaultNetwork != newNetType) {
if (isNewNetTypePreferredOverCurrentNetType(newNetType)) {
// tear down the other
NetworkStateTracker 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 one
if (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：
广播发送地：
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.java
public 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.java
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public 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.java
private 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 disconnect
if(!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.java
public 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, true
03-15 01:18:44.205 556 574 D Tethering: interfaceStatusChanged wlan0, true
03-15 01:18:47.585 556 574 D Tethering: interfaceLinkStateChanged eth0, true
03-15 01:18:47.585 556 574 D Tethering: interfaceStatusChanged eth0, true
03-15 01:18:47.591 556 574 D EthernetNetworkFactory: updateInterface: eth0 link up
03-15 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 starting
03-15 01:18:47.633 1807 1807 E dhcpcd : get_duid: Read-only file system
03-15 01:18:47.738 1807 1807 I dhcpcd : eth0: rebinding lease of 192.168.1.64
03-15 01:18:47.895 1807 1807 I dhcpcd : eth0: acknowledged 192.168.1.64 from 192.168.1.250
03-15 01:18:47.942 1807 1807 I dhcpcd : eth0: leased 192.168.1.64 for 86400 seconds
03-15 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 CONNECTED
03-15 01:18:48.442 556 634 D ConnectivityService: Adding iface eth0 to network 116
03-15 01:18:48.496 556 634 E ConnectivityService: Unexpected mtu value: 0, eth0
03-15 01:18:48.496 556 634 D ConnectivityService: Adding Route [192.168.0.0/22 -> 0.0.0.0 eth0] to network 116
03-15 01:18:48.501 556 634 D ConnectivityService: Adding Route [0.0.0.0/0 -> 192.168.1.250 eth0] to network 116
03-15 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 116
03-15 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]: Lingering
03-15 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 524288,1048576,3145728,524288,1048576,2097152
03-15 01:18:48.572 556 634 D CSLegacyTypeTracker: Sending DISCONNECTED broadcast for type 1 NetworkAgentInfo [WIFI () - 115] isDefaultNetwork=true
03-15 01:18:48.572 556 634 D ConnectivityService: sendStickyBroadcast: action=android.net.conn.CONNECTIVITY_CHANGE
03-15 01:18:48.574 556 634 D CSLegacyTypeTracker: Sending CONNECTED broadcast for type 9 NetworkAgentInfo [Ethernet () - 116] isDefaultNetwork=true
03-15 01:18:48.574 556 634 D ConnectivityService: sendStickyBroadcast: action=android.net.conn.CONNECTIVITY_CHANGE
03-15 01:18:48.574 556 556 D Tethering: Tethering got CONNECTIVITY_ACTION
03-15 01:18:48.575 556 577 D Tethering: MasterInitialState.processMessage what=3
03-15 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_ACTION
03-15 01:18:48.583 556 577 D Tethering: MasterInitialState.processMessage what=3
03-15 01:18:48.588 556 634 D ConnectivityService: setProvNotificationVisibleIntent null visible=false networkType=MOBILE extraInfo=null highPriority=false
03-15 01:18:48.589 556 634 D ConnectivityService: NetworkAgentInfo [Ethernet () - 116] validation passed
03-15 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_ACTION
03-15 01:18:55.216 556 574 D Tethering: interfaceLinkStateChanged wlan0, true
03-15 01:18:55.216 556 574 D Tethering: interfaceStatusChanged wlan0, true
03-15 01:18:56.558 556 634 D ConnectivityService: handlePromptUnvalidated 116
03-15 01:19:13.857 556 632 D WifiStateMachine: starting scan for "360wifi-2"WPA_PSK with 2447
03-15 01:19:14.556 556 574 D Tethering: interfaceLinkStateChanged wlan0, true
03-15 01:19:14.557 556 574 D Tethering: interfaceStatusChanged wlan0, true
03-15 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 lost
03-15 01:19:18.567 556 634 D ConnectivityService: NetworkAgentInfo [WIFI () - 115] got DISCONNECTED, was satisfying 1
03-15 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: 60
03-15 01:19:18.608 1465 1465 I wpa_supplicant: wlan0: CTRL-EVENT-DISCONNECTED bssid=f0:79:59:35:f0:5e reason=3 locally_generated=1
03-15 01:19:18.612 556 574 D Tethering: interfaceLinkStateChanged wlan0, false
03-15 01:19:18.612 556 574 D Tethering: interfaceStatusChanged wlan0, false
03-15 01:19:18.613 556 577 D Tethering: InitialState.processMessage what=4
03-15 01:19:18.617 556 577 D Tethering: sendTetherStateChangedBroadcast 0, 0, 0
03-15 01:19:18.618 556 574 D Tethering: interfaceLinkStateChanged wlan0, false
03-15 01:19:18.618 556 574 D Tethering: interfaceStatusChanged wlan0, false
03-15 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 state
03-15 01:19:18.623 556 632 D WifiNative-HAL: stopRssiMonitoring, cmdId 0
03-15 01:19:18.623 556 632 E WifiConfigStore: saveWifiConfigBSSID Setting BSSID for "360wifi-2"WPA_PSK to any
03-15 01:19:18.638 556 1468 D DhcpClient: Clearing IP address
03-15 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 wlan0
03-15 01:19:18.700 229 551 D CommandListener: Setting iface cfg
03-15 01:19:18.703 556 1798 D DhcpClient: Receive thread stopped
03-15 01:19:18.711 556 632 E WifiConfigStore: saveWifiConfigBSSID Setting BSSID for "360wifi-2"WPA_PSK to any
03-15 01:19:18.723 556 632 D WifiStateMachine: Start Disconnecting Watchdog 13
03-15 01:19:18.732 556 632 D WifiNative-HAL: stopRssiMonitoring, cmdId 0
03-15 01:19:18.735 229 551 D CommandListener: Clearing all IP addresses on wlan0
03-15 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, false
03-15 01:19:20.174 556 574 D Tethering: interfaceStatusChanged wlan0, false
03-15 01:19:20.260 556 632 E WifiConfigStore: rewrite network history for "360wifi-2"WPA_PSK