Android 實戰記錄 (10) - Android 6.0 Mac Address get 02:00:00:00:00:00

今天意外發現Android 6.0 取得 mac address 變成了 02:00:00:00:00:00

http://stackoverflow.com/questions/33159224/getting-mac-address-in-android-6-0

根據stackoverflow上的提問得知

    public String ObtenMAC()
{
    WifiManager manager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    WifiInfo info = manager.getConnectionInfo();

    return(info.getMacAddress().toUpperCase());
}

並得到以下的說明結果

To provide users with greater data protection, starting in this release, Android removes programmatic access to the device’s local hardware identifier for apps using the Wi-Fi and Bluetooth APIs. The WifiInfo.getMacAddress() and the BluetoothAdapter.getAddress() methods now return a constant value of 02:00:00:00:00:00.

To access the hardware identifiers of nearby external devices via Bluetooth and Wi-Fi scans, your app must now have the ACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION permissions.

根據
Android 6.0 Changes

https://developer.android.com/about/versions/marshmallow/android-6.0-changes.html#behavior-hardware-id

得到以下這些內容

Access to Hardware Identifier

---

To provide users with greater data protection, starting in this release, Android removes programmatic access to the device’s local hardware identifier for apps using the Wi-Fi and Bluetooth APIs. The WifiInfo.getMacAddress() and theBluetoothAdapter.getAddress() methods now return a constant value of 02:00:00:00:00:00.

To access the hardware identifiers of nearby external devices via Bluetooth and Wi-Fi scans, your app must now have theACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION permissions:

• WifiManager.getScanResults()
• BluetoothDevice.ACTION_FOUND
• BluetoothLeScanner.startScan()

Note: When a device running Android 6.0 (API level 23) initiates a background Wi-Fi or Bluetooth scan, the operation is visible to external devices as originating from a randomized MAC address.

至於解法，看未來有沒有機會再研究