1 测试步骤

1. 测试机打开Wi-Fi，连接至Test(为需要网页认证才能够使用的Wi-Fi)
2. 测试机在保持Test连接情况下，关闭Wi-Fi再打开

2 测试结果

步骤2中，测试机不能自动重连至Test

3 预期结果

步骤2中，测试机可以自动重连至Test

4 调查过程

4.1 NetworkMonitor.java：：private class EvaluatingState extends State

．．．．．．
int httpResponseCode = isCaptivePortal();
if (httpResponseCode == 204) {transitionTo(mValidatedState);
} else if (httpResponseCode >= 200 && httpResponseCode <= 399) {transitionTo(mCaptivePortalState);
}
．．．．．．

4.2 NetworkMonitor.java：：protected int isCaptivePortal()

......
validationLog("isCaptivePortal: ret=" + httpResponseCode +" headers=" + urlConnection.getHeaderFields());
......

如上打印如下的log

11-28 19:22:06.682  3474  7290 D NetworkMonitor/NetworkAgentInfo [WIFI () - 101]: isCaptivePortal: ret=200 headers={null=[HTTP/1.1 200 OK], Content-Length=[488],Content-Type=[text/html], Location=[https://sprdwlc.spreadtrum.com/fs/customwebauth/login.html ? switch_url=https://sprdwlc.spreadtrum.com/login.html&ap_mac=64:f6:9d:66:3c:20&client_mac=40:45:da:c1:87:2c&wlan=Test&redirect=connectivitycheck.gstatic.com/generate_204], X-Android-Received-Millis=[1480332126681], X-Android-Response-Source=[NETWORK 200], X-Android-Selected-Protocol=[http/1.1], X-Android-Sent-Millis=[1480332126662]}

4.3 NetworkMonitor.java：：private class CaptivePortalState extends State

．．．．．．
public void enter() {mConnectivityServiceHandler.sendMessage(obtainMessage(EVENT_NETWORK_TESTED,NETWORK_TEST_RESULT_INVALID, 0, mNetworkAgentInfo));
．．．．．．

4.4 ConnectivityService.java：：case NetworkMonitor.EVENT_NETWORK_TESTED:

．．．．．．
final boolean valid =(msg.arg1 == NetworkMonitor.NETWORK_TEST_RESULT_VALID);
．．．．．．// Let the NetworkAgent know the state of its network
nai.asyncChannel.sendMessage(android.net.NetworkA从如下的log开始:gent.CMD_REPORT_NETWORK_STATUS,(valid ? NetworkAgent.VALID_NETWORK : NetworkAgent.INVALID_NETWORK),0, null);
．．．．．．

4.5 WifiStateMachine.java::protected void networkStatus()

.....
mIsCaptivePortalCheckEnabled = Settings.Global.getInt(mContext.getContentResolver(),Settings.Global.CAPTIVE_PORTAL_DETECTION_ENABLED, 0) == 1;
if (status == NetworkAgent.INVALID_NETWORK) {if (DBG) log("WifiNetworkAgent -> Wifi networkStatus invalid, score="+ Integer.toString(mWifiInfo.score));unwantedNetwork(NETWORK_STATUS_UNWANTED_VALIDATION_FAILED);
}
.....

4.6 WifiStateMachine.java:void unwantedNetwork()

......
sendMessage(CMD_UNWANTED_NETWORK, reason);
......

4.7 WifiStateMachine.java::case CMD_UNWANTED_NETWORK:

......
} else if (message.arg1 == NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN ||message.arg1 == NETWORK_STATUS_UNWANTED_VALIDATION_FAILED) {config = getCurrentWifiConfiguration();if (config != null) {// Disable autojoinif (message.arg1 == NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN) {config.validatedInternetAccess = false;// Clear last-selected status, as being last-selected also avoids// disabling auto-join.if (mWifiConfigStore.isLastSelectedConfiguration(config)) {mWifiConfigStore.setLastSelectedConfiguration(WifiConfiguration.INVALID_NETWORK_ID);}}config.numNoInternetAccessReports += 1;config.dirty = true;mWifiConfigStore.writeKnownNetworkHistory(false);}
}
.....

4.8 WifiAutoJoinController.java ::boolean attemptAutoJoin()

最终在ＡｕｔｏＣｏｎｎｅｔ的时候在如下的地方被退出．没有进行ＡｕｔｏＣｏｎｎｅｃｔ．

// NOTE: If this condition is updated, update NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN.
if (config.numNoInternetAccessReports > 0&& !isLastSelected&& !config.validatedInternetAccess) {// Avoid autoJoining this network because last time we used it, it didn't// have internet access, and we never manage to validate internet access on this// network configurationif (DBG) {logDbg("attemptAutoJoin skip candidate due to no InternetAccess  "+ config.configKey(true)+ " num reports " + config.numNoInternetAccessReports);}continue;
}

如上打印出如下的log:

11-28 19:22:28.378  3474  5227 D WifiAutoJoinController : attemptAutoJoin() num recent config 1 ---> suppNetId=-1
11-28 19:22:28.378  3474  5227 D WifiAutoJoinController : attemptAutoJoin good candidate seen, bumped hard -> status="Test"NONE status=0
11-28 19:22:28.378  3474  5227 D WifiAutoJoinController : attemptAutoJoin skip candidate due to no InternetAccess  "Test"NONE num reports 1
11-28 19:22:28.378  3474  5227 D WifiAutoJoinController : attemptRoam not associated

5 解决方案

如果需要关闭网络可用性检测.请修改"captive_portal_detection_enabled"的默认值为0.

NetworkMonitor.java :: public NetworkMonitor()mIsCaptivePortalCheckEnabled = Settings.Global.getInt(mContext.getContentResolver(),Settings.Global.CAPTIVE_PORTAL_DETECTION_ENABLED, 0) == 1;