android - Google マップ GPS 追跡アプリ

Question

このアプリで、ユーザーの現在の場所から収集されたジオポイントの配列を結ぶ線を描画しようとしています。接続できるようにアレイにデータを入力しようとすると、行き詰まりました。

コード：

public class MainActivity extends MapActivity implements LocationListener {

private MyLocationOverlay myLocationOverlay;
private MapController mMapController;
private MapView mapview;
private MapController controller;

Location Location;
ArrayList<GeoPoint> geoPointsArray = new ArrayList<GeoPoint>();
String provider = LocationManager.GPS_PROVIDER;
double lat;
double lon;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
    boolean enabled = service.isProviderEnabled(provider); 

    // Check if enabled and if not send user to the GPS settings
    if (!enabled) {
        Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
        startActivity(intent);
    }

    //Creates new MapView
    MapView mapview = (MapView) findViewById(R.id.mapView);
    //Sets up Zoom buttons on screen
    mapview.setBuiltInZoomControls(true);
    //Sets to Satellite View on Map
    mapview.setSatellite(true);
    myLocationOverlay = new MyLocationOverlay(this, mapview);
    myLocationOverlay.enableMyLocation();
    myLocationOverlay.enableCompass();
    mapview.getOverlays().add(myLocationOverlay);
    mapview.invalidate();
    mMapController = mapview.getController();
    //Sets Zoom level
    mMapController.setZoom(20);
    //Moves map To current location.
    myLocationOverlay.runOnFirstFix(new Runnable() {
        @Override
        public void run() {
            mMapController.animateTo(myLocationOverlay.getMyLocation());
        }
    }); 
}

class MyOverlay extends Overlay{
    public MyOverlay(){ 
    }   

    public void draw(Canvas canvas, MapView mapv, boolean shadow){
    super.draw(canvas, mapv, shadow);

    Paint mPaint = new Paint();
    Path p = new Path();
    Projection projection = mapview.getProjection();

    mPaint.setStyle(Style.FILL_AND_STROKE);
    mPaint.setColor(Color.RED);

    mPaint.setDither(true);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(2);


    for (int i = 0; i < geoPointsArray.size(); i++) {
        if (i == geoPointsArray.size() - 1) {
            break;
        }

        Point from = new Point();
        Point to = new Point();
        projection.toPixels(geoPointsArray.get(i), from);
        projection.toPixels(geoPointsArray.get(i + 1), to);
        p.moveTo(from.x, from.y);
        p.lineTo(to.x, to.y);
   }

}

}




    @Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub
    return false;
}


@Override
protected void onPause() {
    super.onPause();
    myLocationOverlay.disableMyLocation();
}

@Override
protected void onResume() {
    super.onResume();
    myLocationOverlay.enableMyLocation();
}

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub

    if (Location != null){
        lat = Location.getLatitude();
        lon = Location.getLongitude();
        GeoPoint New_geopoint = new GeoPoint((int)(lat*1e6),(int)(lon*1e6));
        geoPointsArray.add(New_geopoint);
        controller.animateTo(New_geopoint);

    }

}

@Override
public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}


}

どんな助けでも素晴らしいでしょう。ありがとう