java - Secure.getString(mContext.getContentResolver(), "bluetooth_address") 在 Android O 中返回 null

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) 它返回 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

然而，LOCAL_MAC_ADDRESS permission is a system permission所以实际上你的应用程序不能拥有它。