android6.0以上扫描并获取wifi列表
android6.0以上扫描并获取wifi列表需要打开GPS才有效，否则，获取到的wifi列表为空。它的实现在：
/**
* Return the results of the most recent access point scan, in the form of
* a list of {@link ScanResult} objects.
* @return the list of results
*/
public List<ScanResult> getScanResults(String callingPackage) {
enforceAccessPermission();
int userId = UserHandle.getCallingUserId();
int uid = Binder.getCallingUid();
boolean canReadPeerMacAddresses = checkPeersMacAddress();
boolean isActiveNetworkScorer =
NetworkScorerAppManager.isCallerActiveScorer(mContext, uid);
boolean hasInteractUsersFull = checkInteractAcrossUsersFull();
long ident = Binder.clearCallingIdentity();
try {
if (!canReadPeerMacAddresses && !isActiveNetworkScorer
&& !isLocationEnabled(callingPackage)) {
return new ArrayList<ScanResult>();
}
if (!canReadPeerMacAddresses && !isActiveNetworkScorer
&& !checkCallerCanAccessScanResults(callingPackage, uid)) {
return new ArrayList<ScanResult>();
}
if (mAppOps.noteOp(AppOpsManager.OP_WIFI_SCAN, uid, callingPackage)
!= AppOpsManager.MODE_ALLOWED) {
return new ArrayList<ScanResult>();
}
if (!isCurrentProfile(userId) && !hasInteractUsersFull) {
return new ArrayList<ScanResult>();
}
return mWifiStateMachine.syncGetScanResultsList();
} finally {
Binder.restoreCallingIdentity(ident);
}
}
重点：
if (!canReadPeerMacAddresses && !isActiveNetworkScorer
&& !isLocationEnabled(callingPackage)) {
return new ArrayList<ScanResult>();
}
也就是说谷歌要求我们在定位的时候同时开启GPS的开关，当然这个有可能是谷歌考虑到自己的接口可以通过wifi列表定位，所以要求开发者要让用户有这个知情权吧。
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