Using java.util.Scanner in an Activity in Android

Question

I am trying to read data from .csv-Files in an Android Activity using java.util.Scanner, but no matter what I do, I always get FileNotFoundException.

This is the onCreate() - Method in my Activity:

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Context ctx = getApplicationContext();
    Configuration.getInstance().load(ctx, PreferenceManager.getDefaultSharedPreferences(ctx));
    setContentView(R.layout.activity_map);

    map = (MapView) findViewById(R.id.map);
    map.setTileSource(TileSourceFactory.MAPNIK);
    IMapController mapController = map.getController();
    GeoPoint startPoint = new GeoPoint(35.63291, 139.88039);
    mapController.setCenter(startPoint);
    mapController.setZoom(18);

    Marker startMarker = new Marker(map);
    startMarker.setPosition(startPoint);
    startMarker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM);
    map.getOverlays().add(startMarker);

    List<GeoPoint> geoPoints = new ArrayList<>();

    points();

}

I am calling the static method points(), which uses the Scanner to read from .csv-Files.

This is how the method points() looks like:

 public static void points() {

 try {

    Scanner sc = new Scanner(new File("app/sampledata/nodes.csv"), "UTF-8");

    while (sc.hasNextLine()) {
        String[] content = sc.nextLine().split(";");
        content[6] = content[6].substring(2, content[6].length() - 2);
        String[] nodes = content[6].split(",");
        for (int i = 0; i < nodes.length; i++) {

            try {
                Scanner scanner = new Scanner(new File("app/sampledata/nodes.csv"), "UTF-8");
                while (scanner.hasNextLine()) {
                    String[] nodesContent = sc.nextLine().split(";");
                    String node = nodesContent[0];
                    if (nodes[i].equals(node)) {
                        String latitude = nodesContent[6];
                        String longitude = nodesContent[7];
                        // latLon.add(latitude + "; " + longitude);
                    }
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
    }
} catch (FileNotFoundException e) {
    System.exit(1);
} }

The paths should be correct since the same code is working executed as .java-Class. But when I start the application as an Android application it always throws FileNotFoundException when reaching the line with the Scanner. What could be the reason for that?

Using java.util.Scanner in an Activity in Android

0 Answers0