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//Make Sure Bluetooth is opened
private String getBluetoothAddress(BluetoothAdapter adapter) {
        if (adapter == null) {
            return null;
        }

        Class<? extends BluetoothAdapter> btAdapterClass = adapter.getClass();
        try {
            Field mServiceField = adapter.getClass().getDeclaredField("mService");
            mServiceField.setAccessible(true);
            Object btManagerService = mServiceField.get(adapter);
            if (btManagerService != null) {
                return (String) btManagerService.getClass().getMethod("getAddress").invoke(btManagerService);
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            LogWriter.writeLog(TAG, e.getMessage());
            return null;
        }
}