android6.0以上扫描并获取wifi列表

Chip Platform Rockchip
1

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。