wifi 關掉後，3G 又會打開..
從 log 上看..
V/WifiStateTracker( 2408): DhcpHandler: DHCP request succeeded
D/NetworkStateTracker( 2408): setDetailed state, old =OBTAINING_IPADDR and new state=CONNECTED
V/WifiStateTracker( 2408): IP configuration: ipaddr 192.168.204.177 gateway 192.168.204.254 netmask 255.255.255.0 dns1 192.168.147.15 dns2 192.168.147.240 DHCP server 192.168.204.254 lease 3600 seconds
D/ConnectivityService( 2408): NetworkStateTracker.EVENT_STATE_CHANGED
D/ConnectivityService( 2408): ConnectivityChange for WIFI: CONNECTED/CONNECTED
V/ConnectivityService( 2408): handleConnect : type 1mNetworkPreference9mActiveDefaultNetwork0
V/ConnectivityService( 2408): Policy requires mobile teardown
I/pppd ( 3011): Terminating on signal 15
I/pppd ( 3011): Connect time 94.3 minutes.
I/pppd ( 3011): Sent 32451 bytes, received 353433 bytes.
W/NetworkStateTracker( 2408): Can't set tcp buffer sizes:java.io.FileNotFoundException: /sys/kernel/ipv4/tcp_rmem_min (No such file or directory)
D/WifiWatchdogService( 2408): (android.server.ServerThread) AP4 (00:1e:58:30:70:f9) does not require the watchdog
D/pppd ( 3011): Script /etc/ppp/ip-down-ppp0 started (pid 3525)
D/pppd ( 3011): sent [LCP TermReq id=0x2 "User request"]
好像是 ConnectivityService 負責.grep 一下 "Policy requires mobile teardown".
結果在：
ConnectivityService.java: Ln1264:
private void handleConnect(NetworkInfo info) {
int type = info.getType();
// snapshot isFailover, because sendConnectedBroadcast() resets it
boolean isFailover = info.isFailover();
NetworkStateTracker thisNet = mNetTrackers[type];
Slog.v(TAG,"handleConnect : type " +type+"mNetworkPreference"+mNetworkPreference+"mActiveDefaultNetwork"+mActiveDefaultNetwork);
// if this is a default net and other default is running
// kill the one not preferred
if (mNetAttributes[type].isDefault()) {
if (mActiveDefaultNetwork != -1 && mActiveDefaultNetwork != type) {
if ((type != mNetworkPreference &&
mNetAttributes[mActiveDefaultNetwork].mPriority >
mNetAttributes[type].mPriority) ||
mNetworkPreference == mActiveDefaultNetwork) {
// don't accept this one
Slog.v(TAG, "Not broadcasting CONNECT_ACTION " +
"to torn down network " + info.getTypeName());
teardown(thisNet);
return;
} else {
// tear down the other
NetworkStateTracker otherNet =
mNetTrackers[mActiveDefaultNetwork];
Slog.v(TAG, "Policy requires " +
otherNet.getNetworkInfo().getTypeName() +
" teardown");
if (!teardown(otherNet)) {
Slog.e(TAG, "Network declined teardown request");
return;
}
if (isFailover) {
otherNet.releaseWakeLock();
}
}
}
後面的部份： tear down the other.
所以負責 關掉 wifi 後，打開 mobile (3g) 應該是 handleDisconnect ?
但是看 handleDisconnect，好像只是被動的check network failover 是否成功。
沒有真的去 activate anthor network。
開啟這個 class 的 DBG 選項後，再看 log..
結果：android-reconnect-3g-after-disconect-wifi
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