Question

I’m new in android and I’m testing an application that provides the road path in android. But I have many errors in here (like shown below).

    public class MapRouteActivity extends MapActivity {

        LinearLayout linearLayout;
        MapView mapView;
        private Road mRoad;

        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                mapView = (MapView) findViewById(R.id.mapview);
                mapView.setBuiltInZoomControls(true);

                new Thread() {
                        @Override
                        public void run() {
                                double fromLat = 49.85, fromLon = 24.016667, toLat = 50.45, toLon = 30.523333;
                                String url = RoadProvider
                                                .getUrl(fromLat, fromLon, toLat, toLon);
                                InputStream is = getConnection(url);
                                mRoad = RoadProvider.getRoute(is);
                                mHandler.sendEmptyMessage(0);
                        }
                }.start();
        }

        Handler mHandler = new Handler() {
                public void handleMessage(android.os.Message msg) {
                        TextView textView = (TextView) findViewById(R.id.description);
                        textView.setText(mRoad.mName + " " + mRoad.mDescription);
                        MapOverlay mapOverlay = new MapOverlay(mRoad, mapView);
                        List<Overlay> listOfOverlays = mapView.getOverlays();
                        listOfOverlays.clear();
                        listOfOverlays.add(mapOverlay);
                        mapView.invalidate();
                };
        };

        private InputStream getConnection(String url) {
                InputStream is = null;
                try {
                        URLConnection conn = new URL(url).openConnection();
                        is = conn.getInputStream();
                } catch (MalformedURLException e) {
                        e.printStackTrace();
                } catch (IOException e) {
                        e.printStackTrace();
                }
                return is;
        }

        @Override
        protected boolean isRouteDisplayed() {
                return false;
        }
}

class MapOverlay extends com.google.android.maps.Overlay {
        Road mRoad;
        ArrayList<GeoPoint> mPoints;

        public MapOverlay(Road road, MapView mv) {
                mRoad = road;
                if (road.mRoute.length > 0) {
                        mPoints = new ArrayList<GeoPoint>();
                        for (int i = 0; i < road.mRoute.length; i++) {
                                mPoints.add(new GeoPoint((int) (road.mRoute[i][1] * 1000000),
                                                (int) (road.mRoute[i][0] * 1000000)));
                        }
                        int moveToLat = (mPoints.get(0).getLatitudeE6() + (mPoints.get(
                                        mPoints.size() - 1).getLatitudeE6() - mPoints.get(0)
                                        .getLatitudeE6()) / 2);
                        int moveToLong = (mPoints.get(0).getLongitudeE6() + (mPoints.get(
                                        mPoints.size() - 1).getLongitudeE6() - mPoints.get(0)
                                        .getLongitudeE6()) / 2);
                        GeoPoint moveTo = new GeoPoint(moveToLat, moveToLong);

                        MapController mapController = mv.getController();
                        mapController.animateTo(moveTo);
                        mapController.setZoom(7);
                }
        }

        @Override
        public boolean draw(Canvas canvas, MapView mv, boolean shadow, long when) {
                super.draw(canvas, mv, shadow);
                drawPath(mv, canvas);
                return true;
        }

        public void drawPath(MapView mv, Canvas canvas) {
                int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
                Paint paint = new Paint();
                paint.setColor(Color.GREEN);
                paint.setStyle(Paint.Style.STROKE);
                paint.setStrokeWidth(3);
                for (int i = 0; i < mPoints.size(); i++) {
                        Point point = new Point();
                        mv.getProjection().toPixels(mPoints.get(i), point);
                        x2 = point.x;
                        y2 = point.y;
                        if (i > 0) {
                                canvas.drawLine(x1, y1, x2, y2, paint);
                        }
                        x1 = x2;
                        y1 = y2;
                }
        }
}

while i lunch this code i have all these error like bellow :

07-30 14:03:08.969: W/dalvikvm(6934): Unable to resolve superclass of Lcom/test/MapRouteActivity; (17)
07-30 14:03:08.969: W/dalvikvm(6934): Link of class 'Lcom/test/MapRouteActivity;' failed
07-30 14:03:08.969: W/dalvikvm(6934): threadid=1: thread exiting with uncaught exception (group=0x2aac87c8)
07-30 14:03:08.979: E/AndroidRuntime(6934): FATAL EXCEPTION: main
07-30 14:03:08.979: E/AndroidRuntime(6934): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.test/com.test.MapRouteActivity}: java.lang.ClassNotFoundException: com.test.MapRouteActivity in loader dalvik.system.PathClassLoader[/data/app/com.test-1.apk]
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.os.Looper.loop(Looper.java:123)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.ActivityThread.main(ActivityThread.java:4627)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at java.lang.reflect.Method.invokeNative(Native Method)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at java.lang.reflect.Method.invoke(Method.java:521)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at dalvik.system.NativeStart.main(Native Method)
07-30 14:03:08.979: E/AndroidRuntime(6934): Caused by: java.lang.ClassNotFoundException: com.test.MapRouteActivity in loader dalvik.system.PathClassLoader[/data/app/com.test-1.apk]
07-30 14:03:08.979: E/AndroidRuntime(6934):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
07-30 14:03:08.979: E/AndroidRuntime(6934):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
07-30 14:03:08.979: E/AndroidRuntime(6934):     ... 11 more

Answer 1

Use Below Code Snippet

private List<Overlay> mapOverlays;

private Projection projection;  

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

linearLayout = (LinearLayout) findViewById(R.id.zoomview);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);

mapOverlays = mapView.getOverlays();        
projection = mapView.getProjection();
mapOverlays.add(new MyOverlay());        

}

@Override
protected boolean isRouteDisplayed() {
return false;

}

class MyOverlay extends Overlay{

public MyOverlay(){

}   

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

Paint   mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(2);

GeoPoint gP1 = new GeoPoint(19240000,-99120000);
GeoPoint gP2 = new GeoPoint(37423157, -122085008);

Point p1 = new Point();
Point p2 = new Point();
Path path = new Path();

projection.toPixels(gP1, p1);
projection.toPixels(gP2, p2);

path.moveTo(p2.x, p2.y);
path.lineTo(p1.x,p1.y);

canvas.drawPath(path, mPaint);
}