Secure.getString(mContext.getContentResolver(), "bluetooth_address") return 在 Android 中为空 O

Question

当我尝试通过这种方式在 Android O 设备上获取蓝牙地址时：

private String getBlutoothAddress(Context mContext){  
    // Check version API Android
    BluetoothAdapter myBluetoothAdapter;
       
    String macAddress;

    int currentApiVersion = android.os.Build.VERSION.SDK_INT;

    if (currentApiVersion >= android.os.Build.VERSION_CODES.M) {
        macAddress = Settings.Secure.getString(mContext.getContentResolver(), "bluetooth_address"); 
    } else {
        // Do this for phones running an SDK before lollipop
        macAddress = myBluetoothAdapter.getAddress();            
    }
}

上面的所有代码都运行良好，直到我将该代码用于 Android O (8.0) it returns macAddress = null.

Answer 1

您的应用需要持有 LOCAL_MAC_ADDRESS 权限：

Settings.Secure.bluetooth_address: Device Bluetooth MAC address. In O, this is only available to apps holding the LOCAL_MAC_ADDRESS permission.

https://android-developers.googleblog.com/2017/04/changes-to-device-identifiers-in.html

但是，LOCAL_MAC_ADDRESS permission is a system permission 所以实际上您的应用程序不能拥有它。

Answer 2

由于您只想识别您的设备，您可以使用 getImei() 来自 TelephonyManager API. Note that you will need to request READ_PHONE_STATE permission 的用户，因为它具有危险保护级别。

如果这样的 API 在您的测试中被证明不可靠，请从另外两个问题 Unique Android Device ID and Serial Number of Android device 中寻找替代方法（它们有其自身的缺点）。

Secure.getString(mContext.getContentResolver(), "bluetooth_address") return 在 Android 中为空 O

Secure.getString(mContext.getContentResolver(), "bluetooth_address") return null in Android O

java

android

android-permissions

android-bluetooth

android-8.0-oreo