[RK3288][Android6.0] 一律运行WLAN漫游扫描选项

Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

开发者选项中有一栏是“”Always allow Wi‑Fi Roam Scans“

解释是运行WLAN漫游扫描，看它是如何影响扫描执行流程

对应是string name在
packages/apps/Settings/res/values/strings.xml:3645:
<string name="wifi_allow_scan_with_traffic">Always allow Wi\u2011Fi Roam Scans</string>

代码里查找wifi_allow_scan_with_traffic
DevelopmentSettings.java
private static final String WIFI_ALLOW_SCAN_WITH_TRAFFIC_KEY = "wifi_allow_scan_with_traffic";
mWifiAllowScansWithTraffic = findAndInitSwitchPref(WIFI_ALLOW_SCAN_WITH_TRAFFIC_KEY);
点切换选项时，触发click操作：

public boolean onPreferenceTreeClick()
{} else if (preference == mWifiAllowScansWithTraffic) {writeWifiAllowScansWithTrafficOptions();
}private void writeWifiAllowScansWithTrafficOptions() {mWifiManager.setAllowScansWithTraffic(mWifiAllowScansWithTraffic.isChecked() ? 1 : 0);
}

WifiStateMachine.java

public void setAllowScansWithTraffic(int enabled) {mWifiConfigStore.alwaysEnableScansWhileAssociated.set(enabled);
}

存到了mWifiConfigStore,找对应的get接口

public int getAllowScansWithTraffic() {return mWifiConfigStore.alwaysEnableScansWhileAssociated.get();
}

getAllowScansWithTraffic调用的地方

boolean allowFullBandScanAndAssociated() {// Too much traffic at the interface, hence no full band scanif (getAllowScansWithTraffic() == 0) {return false;}
}

当屏幕状态变化的时候，会调用

private void handleScreenStateChanged(boolean screenOn) {if (screenOn) {//如果allowFullBandScanAndAssociated()返回false,那么无论是startGScanConnectedModeOffload()//还是startDelayedScan()都无法执行scan了if (getCurrentState() == mConnectedState&& allowFullBandScanAndAssociated()) {if (useHalBasedAutoJoinOffload()) {startGScanConnectedModeOffload("screenOnConnected");} else {// Scan after 500msstartDelayedScan(500, null, null);}}}
}

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