APP無法取得手機所連接Wi-Fi的SSID


最近修Bug時，遇到了取得的SSID值是 <unknown ssid=""> 的狀況，確認過使用者的定位授權(android.permission.ACCESS_FINE_LOCATION)，也都有正常開啟，一開始以為是特定機種的問題，但後來其他測試機也有類似的狀況，找了下資料，才知道真正的原因。

上述取得SSID的程式碼如下：


在Android 8.1 (API 27)(含)以上版本，APP只擁有使用者的定位權限是不夠的，還需要手機的GPS功能也同時打開才行。

目前看到的結論是，暫時沒有其他的方法可以繞過，一定要上面兩個條件同時滿足，才能拿到正確的SSID。

另外也有文章提到，在理論上就算只有Ｗi-Fi資訊 (SSID名稱)，還是有機會確認出使用者目前的所在位置，所以在保護使用者隱私的原則下，要使用者同意此時可以被定位 (開啟GPS功能)，APP才能取得有關使用者位置的資訊，也是相對合理的做法。



資料參考來源：
https://stackoverflow.com/questions/21391395/get-ssid-when-wifi-is-connected
https://www.davx5.com/faq/wifi-ssid-restriction-location-permission

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