I would like to read an XML file in my activity that I copied to an SD card.
If the file does not exist, I read the data from the string file. This part works.
I’ve tried and researched a lot, but unfortunately, I can’t get anywhere. Maybe someone has the right tip for me?

My AndroidManifest.xml:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

In the MainActivity.java, under onCreate:

        // first check for runtime permission
        String permission = android.Manifest.permission.READ_EXTERNAL_STORAGE;
        int grant = ContextCompat.checkSelfPermission(this, permission);
        if (grant != PackageManager.PERMISSION_GRANTED) {
            String[] permission_list = new String[1];
            permission_list[0] = permission;
            ActivityCompat.requestPermissions(this, permission_list, 1);
        }else {
            Log.v(TAG, "OnCreate(): grant is not READ_EXTERAL_STORAGE");
        }

        // Switch-Liste erstellen und an den View binden
        createSwitchlList();
        bindAdapterToListView();

In createSwitchList():

    private void createSwitchlList() {
        boolean fromFile = false;
        Log.v(TAG, "createSwitchList() entered.");

        //First check if the sd card is mounted or not
        if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
            // sd card mounted
            Log.v(TAG, "SD-CARD is available");
        }

        String myFile = new File(getExternalStorageDirectory() + File.separator + "MyWifiDemo" + File.separator + "switch.xml").toString();
        if (myFile != null) {
            Log.v(TAG, "Find path/file " + myFile);

            fromFile = true;

            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder;

            try {

                dBuilder = dbFactory.newDocumentBuilder();
                Document doc = dBuilder.parse(myFile);
                doc.getDocumentElement().normalize();
                Log.v(TAG, "XML-root: " + doc.getDocumentElement().getNodeName());

            } catch (RuntimeException e) {
                Log.v(TAG, "Read-XML-Document RuntimeExeption: " + e);
                fromFile = false;
            } catch (Exception e) {
                Log.v(TAG, "Read-XML-Document Exeption: " + e);
                fromFile = false;
            }
        }
        if (!fromFile) {
            Log.v(TAG, "Path or file not found");

            String[] geradeOn = getResources().getStringArray(R.array.gerade_an);
            String[] geradeOff = getResources().getStringArray(R.array.gerade_aus);
            String[] abzweigOn = getResources().getStringArray(R.array.abzweig_an);
            String[] abzweigOff = getResources().getStringArray(R.array.abzweig_aus);

            mSwitchListe.clear();
            for (int i = 0; i < geradeOn.length; i++) {
                Switch newSwitch = new Switch(getString(R.string.dcc_address) + (i + 1),
                        getString(R.string.dcc_status_gerade), geradeOn[i], geradeOff[i],
                        abzweigOn[i], abzweigOff[i]);
                mSwitchListe.add(newSwitch);
            }
            Toast.makeText(getApplicationContext(), "Acht Schalter erstellt, XML-Datei existiert nicht", Toast.LENGTH_SHORT).show();
            Log.v(TAG, "*** Acht Schalter erstellt, XML-Datei existiert nicht");
        }
    }

And this is my log:

15:12:57.759 MainActivity            de.dfwschmidts.mywifidemo            V  MainActivity Version 5.0.17
15:12:57.777 MainActivity            de.dfwschmidts.mywifidemo            V  createSwitchList() entered.
15:12:57.780 MainActivity            de.dfwschmidts.mywifidemo            V  SD-CARD is available
15:13:05.072 MainActivity            de.dfwschmidts.mywifidemo            V  Find path/file /storage/emulated/0/MyWifiDemo/switch.xml
15:13:23.857 MainActivity            de.dfwschmidts.mywifidemo            V  Read-XML-Document Exeption: java.net.MalformedURLException: no protocol: /storage/emulated/0/MyWifiDemo/switch.xml
15:13:28.351 MainActivity            de.dfwschmidts.mywifidemo            V  Path or file not found
15:13:32.895 MainActivity            de.dfwschmidts.mywifidemo            V  *** Acht Schalter erstellt, XML-Datei existiert nicht
15:13:32.905 MainActivity            de.dfwschmidts.mywifidemo            V  2. Stufe: onStart() betreten
15:13:32.911 MainActivity            de.dfwschmidts.mywifidemo            V  3. Stufe: onResume() betreten
15:13:33.293 MainActivity            de.dfwschmidts.mywifidemo            V  4. Stufe: onPause() betreten
15:13:33.309 MainActivity            de.dfwschmidts.mywifidemo            V  onRequestPermissionsResult: READ_EXTERNAL_STORAGE permission not granted. Result: -1

15:13:33.310 MainActivity            de.dfwschmidts.mywifidemo            V  3. Stufe: onResume() betreten

15:13:40.663 MainActivity            de.dfwschmidts.mywifidemo            V  4. Stufe: onPause() betreten

15:13:41.077 MainActivity            de.dfwschmidts.mywifidemo            V  5. Stufe: onStop() betreten
15:13:41.085 MainActivity            de.dfwschmidts.mywifidemo            V  --> Zustand speichern: onSaveInstanceState() betreten

15:13:44.884 MainActivity            de.dfwschmidts.mywifidemo            V  6. Stufe: onDestroy() betreten