Probleme mit NFC File Transfer

public void onCreate(){
PackageManager pm = getActivity().getPackageManager();
// Check whether NFC is available on device
if (!pm.hasSystemFeature(PackageManager.FEATURE_NFC)) {
    // NFC is not available on the device.
    getActivity().runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(rootView.getContext(), "The device does not has NFC hardware.",
                    Toast.LENGTH_SHORT).show();
        }
    });

}
// Check whether device is running Android 4.1 or higher
else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
    // Android Beam feature is not supported.
    getActivity().runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(rootView.getContext(), "Android Beam is not supported.",
                    Toast.LENGTH_SHORT).show();
        }
    });

}
else {
    // NFC and Android Beam file transfer is supported.
    //Toast.makeText(rootView.getContext(), "Android Beam is supported on your device.",
    //      Toast.LENGTH_SHORT).show();
}
sendFile();
}

public void sendFile() {
    try {
        nfcAdapter = NfcAdapter.getDefaultAdapter(rootView.getContext());

        // Check whether NFC is enabled on device
        if (!nfcAdapter.isEnabled()) {
            // NFC is disabled, show the settings UI
            // to enable NFC
            Toast.makeText(rootView.getContext(), "Please enable NFC.",
                    Toast.LENGTH_SHORT).show();
            startActivity(new Intent(Settings.ACTION_NFC_SETTINGS));
        }
        // Check whether Android Beam feature is enabled on device
        else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            if (!nfcAdapter.isNdefPushEnabled()) {
                // Android Beam is disabled, show the settings UI
                // to enable Android Beam
                Toast.makeText(rootView.getContext(), "Please enable Android Beam.",
                        Toast.LENGTH_SHORT).show();
                startActivity(new Intent(Settings.ACTION_NFCSHARING_SETTINGS));
            } else {
                // NFC and Android Beam both are enabled

                // File to be transferred
                // For the sake of this tutorial I've placed an image
                // named 'wallpaper.png' in the 'Pictures' directory
                String fileName = "abzk_file_transfer.png";

                // Retrieve the path to the user's public pictures directory
                File fileDirectory = new File(Environment.getExternalStorageDirectory() + "/Arbeitszeit-Kalkulator Temp");

                // Create a new file using the specified directory and name
                File fileToTransfer = new File(fileDirectory, fileName);
                fileToTransfer.setReadable(true, false);

                nfcAdapter.setBeamPushUris(
                        new Uri[]{Uri.fromFile(fileToTransfer)}, getActivity());
            }
        }
    } catch (Exception e) {

    }
}